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[97.95.166.141]) by smtp.gmail.com with ESMTPSA id x184-20020a3763c1000000b00738e8e81dc9sm10646871qkb.75.2023.03.08.05.43.40 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Mar 2023 05:43:40 -0800 (PST) Content-Type: multipart/alternative; boundary="------------y1ihGZDaxLcFZl4Lsm00hlUA" Message-ID: <1a972f3d-25f5-3fda-06fc-34976c4abe49@gmail.com> Date: Wed, 8 Mar 2023 08:43:39 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: Pro-Log PLS868 Content-Language: en-US To: SBC-85 References: From: whalphen In-Reply-To: This is a multi-part message in MIME format. --------------y1ihGZDaxLcFZl4Lsm00hlUA Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sorry Craig.  I don't.  I never ventured into the 6800 space. Will On 3/7/2023 11:49 PM, SBC-85 wrote: > Hi Will, > > You wouldn’t happen to have the schematic or any documentation for one > of these Pro-Log PLS 868. 6800 card would you? > > Pro-Log PLS-868 c.JPG > >> On Mar 6, 2023, at 10:47 AM, whalphen wrote: >> >>  >> >> I saw your video on the card guides and cooling plenum. Nice job!  I >> already have a couple of backplanes and I have card guides.  So won't >> need more. >> >> I hope things are going well for you.  Do you have any fun projects >> underway? >> >> Here's an update on the projects I'm currently working on. (Several >> more in the queue, though.) >> >> My EPROM programmer is progressing well.  It will have two PCBs, >> stacked.  The first one is the power supply and controller board.  >> It's got multiple switching converters to produce various voltage >> levels.  The first PCB was made and is now being tested.  The power >> converters all work.  I opted to put an Arduino Pro Mini on board as >> the microcontroller -- because it's cheap and readily available.  I >> only had 3.3 volt versions and expect some 5 volt versions to arrive >> this week.  Then I'll continue testing.  The processor will be able >> to enable/ disable each power supply individually.  It will also be >> able to measure and adjust the voltage level on each.  The plan is to >> use the power supply board with various EPROM socket modules. The >> first will be a 1702A programmer.  I have the PCB designed and it >> will be sent with my next PCB batch order. Next step is the >> software.  I'm working on a GUI to run on Windows to control the >> programmer via a USB connection.  I hadn't used Visual Studio in a >> few years and I found that the latest version doesn't seem to have >> the control for interfacing via serial ports anymore.  They've also >> greatly complicated the procedure for creating a standalone software >> product, i.e., a .exe file.  So I ended up rolling back to an earlier >> version.  Now I'm remembering why I never liked using Microsoft tools. >> >> I had a group of students request a design for a noise cancelling >> circuit for headphones.  It's just a simple analog circuit and seems >> to be working.  It's not as good as Bose noise cancelling, but it >> meets their needs as a demonstration as part of a medical product >> they're designing for a competition.  They also need an inverter >> circuit to produce about 35 volts AC from a 9 volt battery.  This >> will be used for controlling the opacity of a plastic lens for the >> same project.  I designed and built a circuit for them. It works on >> my workbench.  We'll test it on the lens this week. >> >> I guided a student through the construction of a reflow oven using a >> design I did a few years ago.  It's working and she was able to >> successfully reflow a test board. >> >> Another student is working on a Cyclic Voltameter as a project for a >> class she is in.  I had never heard of this until I looked it up.  >> It's a pretty interesting analytical chemistry technique.  I made >> some improvements to her circuit and designed a PCB.  Now she is >> testing it and starting to get some good results with her probe.  >> (With my town being the global headquarters of Dow Chemical, we get a >> lot of students interested in chemistry.  Especially if they have a >> PhD chemist or two in the family.) >> >> These projects have been keeping me from completing my GPSDO design.  >> But I've confirmed all the parts and dimensions and tested major >> parts of the circuit.  Next I will be doing the PCB layouts. >> >> So far it's been a busy winter -- though I did find time to spend a >> few weeks on the gulf coast. >> >> Regards. >> >> Will >> >> On 3/6/2023 2:27 AM, craig@sbc-85.com wrote: >>> >>> Hi Will, I hope all is well. >>> >>> I forget, I know you made one also, but did I send you a STD >>> backplane?  I now have card guides for the backplane and if you >>> would like I can send you a backplane and a set of card guides.  I >>> can print a cooling plenum too if you are running anything that gets >>> hot enough to need it. >>> >>> Just let me know what color you would like and I can print them and >>> send them out to you. >>> >>> Best regards >>> >>> Craig >>> >>> *From:* whalphen >>> *Sent:* Thursday, July 28, 2022 10:41 AM >>> *To:* SBC-85 >>> *Subject:* Re: 38P70 clock and companions >>> >>> Hi Craig.  Wow!  Nice job on the documentation! >>> >>> I don't need a new project -- but this one looks good enough to bump >>> some other project off my list.  So yeah, I'll plan on building >>> this.  I don't have all my old 74LS chips in my online inventory, so >>> I'll need to manually check them against your BOM and get any >>> missing parts on order.  (Actually I recently organized all my old >>> chips, so I might as well get them into the database while I'm at >>> it.  I've been using PartsBox for a few years.  It's been a great >>> help in managing the parts inventory -- especially for all the kits >>> we use with the school groups.  If you haven't seen it, check it >>> out. Jan Rychter has done an excellent job developing and >>> commercializing the product.  He's also a nice guy, readily >>> accessible and responsive if any problems.  And best of all, you can >>> use the software for free.  I think there is a stated limit on the >>> number of parts you can track for free, but he doesn't enforce that >>> limit.) >>> >>> I did some programming of the 38P70.  Your video on setting up the >>> assembler was very helpful.  And the software you provided was great >>> to get me back into the assembly language programming mindset.  I >>> used the internal counter to create a 1 KHz timebase and intend to >>> try using the LM331 V to F converter to do some analog measurement.  >>> I had trouble getting the LM331 chip -- the US suppliers >>> distributors are all out of stock.  I received some from AliExpress, >>> but they turned out to be fake.  I managed to get some from Newark's >>> UK stock.  Now I just need to wire them up. >>> >>> Interestingly, Newark also showed stock on some Microchip components >>> I need, but after I placed the order, they sent an email stating >>> that they would not send the Microchip parts.  Apparently Microchip >>> has asked them to sell only to certain commercial customers -- and >>> that doesn't include me.  Unfortunately Microchip has bought up many >>> of the other manufacturers over the past few years, so that means >>> many chips are no longer readily available to individuals.  I did >>> notice that non-commercial customers can can still place orders >>> directly with Microchip, but the shipments are from Thailand and the >>> cost of shipping is high.  So it's a deal breaker unless I place a >>> large order. >>> >>> I've been working on building a programmer for 1702A eproms.  I have >>> some PIC microcontrollers and tried using one to act as a boost >>> converter.  It worked, except that it doesn't have quite the timing >>> resolution I need for the PWM.  And the ones that do are not >>> available.  So I decided to just use boost converter chips and >>> select specific voltage levels directly from the microcontroller's >>> GPIO pins.  My objective is to leverage the same design as a voltage >>> source for another programmer for 8748 processors.  But, again, I'm >>> having trouble sourcing parts.  The shortages are affecting even >>> some mosfets.  Oh well.  I have enough parts on hand to breadboard >>> the boost circuits.  I'll look for alternative mosfets in the >>> meantime.  I obtained some of them from AliExpress and they are >>> actually functional -- but don't know if they will meet the specs >>> stated in the datasheets.  AliExpress seems to be a reasonable >>> source for passive components, but I've had too many bad experiences >>> with silicon I've purchased there in the past couple of years.  But >>> I've always been able to easily get a refund for the bad stuff. >>> >>> I typically have multiple projects going in parallel. So I switched >>> projects and built a VHF power amp that I had on the back burner.  >>> And also a HF power amp.  And got some more work done on a couple of >>> antenna projects.  I'm starting to think that I'm spending just as >>> much time on the task switching as on the projects themselves! >>> >>> Thanks for updating me on the status of the documentation for the >>> 8085 STD card.  It'll be good to put some of my old STD stuff to use >>> again.  Vintage chips may end up being the only feasible option if >>> the semiconductor shortages continue! >>> >>> Regards. >>> >>> Will >>> >>> On 7/27/2022 10:52 PM, SBC-85 wrote: >>> >>> Hi Will >>> >>> I have been working on the STD board this week and the >>> documentation.  So far the board looks good if you need a new >>> build project. >>> >>> http://bitsofthegoldenage.org/documentation/std-8085-sbc-v1-x-documentation/ >>> >>> Regards >>> >>> Craig >>> >>> >>> >>> On Jun 23, 2022, at 9:15 AM, whalphen >>> wrote: >>> >>>  >>> >>> Thanks Craig.  Good job with the code.  It's been a few >>> years since I've done any assembly language programming.  C >>> and C++ have spoiled me.  It's always helpful to have some >>> working routines as a base to build on.  I'm not one to be >>> critical of others' coding.  If it works it's good.  Of >>> course there are always opportunities to change and improve >>> code -- and I always appreciate when I find some code I can >>> improve on.  One of the fun things about assembly language >>> programming on processors from the early years is when I >>> stumble across a way to save a byte or two of ROM or RAM. On >>> modern systems, there just isn't much satisfaction in saving >>> memory or cycles when the system runs 100 times faster than >>> necessary and has many kilobytes unused anyway. >>> >>> I do not have a programmer for the 8755.  I never used that >>> chip.  The designs I worked on used the 8742, which was >>> basically added a slave MCS-48 processor core to the 8755.  >>> However, I don't have a programmer for the 8742 either.  In >>> our old instrument development workshop, we had a couple of >>> Intellec development systems.  One had an 8085 emulator in >>> it.  The other had an 8742 emulator in it.  Our STD designs >>> used the 8085 as the main processor.  And we offloaded the >>> user interfaces to an 8748 STD board that we custom >>> designed. Debugging of the software involved two people -- >>> one running the 8085 emulator and the other running the 8742 >>> emulator.  We also used our own STD board design for >>> actuating valves, mixers, and other devices.  And we >>> developed some measurement instruments that would plug into >>> the STD bus.  For example, we designed a colorometer that >>> used a fiber optic probe to pass a light of a specific color >>> through a sample stream to detect the presence of specific >>> chemicals.  By offloading some of the work to the 8748, we >>> could do more data processing on the 8085.  It was loads of >>> fun!  And we got paid for it! >>> >>> Although I think it would be fun to play with a minimal 8085 >>> system -- I've always kicked around the idea of building one >>> -- I'm not currently setup for it. >>> >>> Will >>> >>> On 6/22/2022 7:55 PM, craig@sbc-85.com wrote: >>> >>> Hi Will >>> >>> I have attached a zip file with the clock code.  Renamed >>> in case your antivirus or a server along the way takes >>> issue with a *.bin file. >>> >>> I am using the dasm assembler.  Included in these is a >>> txt file that is the command line usage for that >>> assembler.  I have had a wave of people asking for a >>> video on setting up to program the F8.  For my channel, >>> two requests is a wave, any more and it is a tsunami. >>>   So such a video is in the concept stage. >>> >>> I forget my last bit of work with this and am 99% sure >>> this is the latest code that is what I sent you,  I know >>> code should stand on its own, but let me look through >>> the code and call forth the wisdom genie to hand out >>> useful pieces of advice---- >>> >>> 1. All of the commented out PI subroutines was for >>> diagnostics and no longer serve a purpose >>> 2. You can see that I use the SET pseudo opcode >>> frequently to provide a local assignment to >>> registers.  I am not sure if I even tested this >>> assembler to see if it gives errors if I try to >>> redefine after using the EQU pseudo opcode but that >>> is my policy….. EQU for things defined once, SET for >>> throwaway definitions. >>> 3. The current state of port 0 and 5 are kept in >>> registers.  When modified the register value is >>> changed and then sent out to the port rather than >>> changing directly. >>> 4. I am working on wiping out all of the initial clock >>> set code and just have it come up with the saved >>> time.  If the user wants to change they can then >>> enter a change mode. >>> 5. I thought I just commented out the serial port >>> output for the splashscreen and the input test but I >>> do not see them at all. But the CI and CO routines >>> have been tested and were working.  1200 baud it >>> says but I may have been tweaking the delay values >>> and not gotten back to updating the comment.  So >>> maybe 2400 but probably 1200. >>> 6. The main loop is, as expected, the WAIT: portion of >>> the code and it is called out by an interrupt to >>> flip the LED. >>> 7. All calls are only one deep so there is a noticeable >>> essence of the 8008 and other stackless devices. >>> 8. If you think this code is embarrassingly amateurish, >>> you should have seen my first attempt.  This **is** >>> the improved version. >>> >>> If you have any questions about why I did something how >>> I did it, please ask.  We can then try to figure it out >>> together. >>> >>> I am thinking of reissuing an old board I made that is >>> essentially the intel MCS-85 3-chip minimum system that >>> they put in all their MCS-85 data books.  I haven’t >>> bothered with this board since very few can program the >>> 8755.  How about you? can you program 8755s and would >>> have a interest in such a board? >>> >>> I am also thinking of resurrecting another version that >>> has two 8155s and two 8755s so, except for the 8279 >>> keyboard/display controller (and keypad and display) it >>> basically has the same functionality as a SDK-85.  A >>> terminal is much easier to use than the keyboard/display >>> on the SDK which is why I didn’t bother with a keypad. >>> >>> Regards >>> >>> craig >>> >>> *From:* whalphen >>> >>> *Sent:* Wednesday, June 22, 2022 3:01 PM >>> *To:* SBC-85 >>> *Subject:* Re: 38P70 clock and companions >>> >>> Hi Craig, >>> >>> I tried the MK38P70 board.  It's nice to see a processor >>> run after being stored away and forgotten for four >>> decades!  My first order of business was to check each >>> of the chips I have. Here's my results. >>> >>> Of the labeled ceramic chips, 4 seem to work fine.  2 >>> were bad.  And one would run, but some of the displayed >>> letters were garbled. >>> >>> I have four ceramic chips with no markings. One of them >>> was non-functional.  Three displayed HELLO WORLD but >>> would not branch into the clock setup.  Perhaps these >>> are a different version of the chip that's not fully >>> compatible with your program. >>> >>> Of the ones labelled as PACKAGE SAMPLE, 4 worked.  3 >>> were non-functional, and one was labelled 2732 and I >>> didn't test it. >>> >>> I have another couple of chips in a package that I >>> didn't retrieve from storage and will test these later. >>> >>> Some questions... >>> >>> Can you give me a listing of the program you provided? >>> How did you assemble the program?  Was it hand assembled >>> or did you use an assembler? >>> >>> Next I intend to set up an assembler and try writing a >>> program.  If I can start with the program you wrote and >>> modify/ extend it, that would be helpful. >>> >>> Will >>> >>> On 6/21/2022 9:11 PM, SBC-85 wrote: >>> >>> Hi will >>> >>> Yea, I wanted you to be able to get going quickly. >>> >>> … there is always the kitchen table if your bench >>> isn’t clear. Who could complain about the worlds >>> first microcomputer? >>> >>> >>> >>> >>> On Jun 21, 2022, at 5:39 PM, whalphen >>> >>> wrote: >>> >>>  >>> >>> Hi Craig, >>> >>> I received your package today.  I was pleasantly >>> surprised to see all that you put in there.  >>> Thank you very much!  I can see that I won't run >>> out of things to play with anytime soon.  Now I >>> need to go clear the stuff off my workbench so I >>> can try out the 38P70 tomorrow! >>> >>> Will >>> >>> On 6/17/2022 3:47 PM, craig@sbc-85.com wrote: >>> >>> Hi Will, >>> >>> All boxed up and ready to go.  USPS tracking >>> number ---- >>> >>> 9405511108033825465675 >>> >>> >>> The STD board works and has been tested at a >>> minimal level. I need to do some more >>> extensive testing with the memory mapping to >>> have a wider combination of standard and >>> auxiliary configurations, but it works with >>> everything I have tried so far.  I really >>> like not having fixed configurations on the >>> memory sockets and being able to use the ZIF >>> for high memory while using a resident >>> monitor in a base EPROM, or moving the ZIF >>> to 0x0000 if I want to work on the resident >>> monitor program and have it easy to pop in >>> and out.  As always, lots of documentation >>> and software to write and I want to test it >>> with EEPROMs but need to write code first.  >>>  I also have not even started testing the >>> STD interface so I need to put it in a cage >>> and start adding other boards. >>> >>> Thanks for the video feedback and >>> encouragement.  I don’t think that I will >>> influence many of those raised on JTAG to >>> disconnect their super-tool and go back to >>> old-school diagnostics, but I hope to do my >>> little part.  I am getting anxious to start >>> getting my intellect 8/80 boards up. Not >>> that every grandmother will want to build an >>> intellect 8, but there is a lot of history >>> there. >>> >>> Summer has not started here yet.  A bit of >>> flying but not as much as usual for this >>> time of year.  I always have projects at >>> home, so never any time to roam the bars or >>> otherwise cause trouble.  There are already >>> a lot of flying videos so I don’t think I >>> have a lot to contribute there.  What I may >>> do is some geology of the pacific northwest >>> flying videos since we live in a pretty >>> amazing area geology wise and it can be >>> beautiful from the air.  This is an amazing >>> part of the country by any measure, but >>> especially the story about how the pacific >>> northwest came to be. >>> >>> Best regards, >>> >>> craig >>> >>> *From:* whalphen >>> >>> *Sent:* Friday, June 17, 2022 7:14 AM >>> *To:* craig.andrews@tessol-inc.com >>> *Subject:* Re: 3870 project >>> >>> Hi Craig.  I was traveling the last few >>> weeks (Michigan to North Carolina to Alabama >>> to Louisiana then returned via the same long >>> route) but I managed to watch the 38P70 >>> videos.  Good job!  I keep thinking how >>> valuable your videos are in that they pull >>> together a lot of relevant information from >>> the past and preserve it for those who will >>> be interested in the future. >>> >>> I got back to Michigan in time for the start >>> of the nice weather and have been spending >>> time getting caught up on things at home.  I >>> just finished re-installing my HF antennas, >>> having removed them for some tree cutting >>> last fall. >>> >>> I am eager to try out the 38P70 board. So >>> yes, please send it. >>> >>> Next month things will slow down around here >>> and I'll be looking forward to spending time >>> in my workshop in the cool basement >>> constructing and testing some PCBs.  The >>> last several years I've mostly done RF >>> design and construction, gradually moving >>> from analog designs to more digital signal >>> processing.  But much of that is on hold now >>> as the digital processors are all out of >>> stock.  So the 38P70 will be a nice shift of >>> focus. >>> >>> What's the status of your STD bus 8085 >>> processor board?  I'm thinking I would like >>> to build one of those at some point. >>> >>> I hope you are finding time to get out and >>> enjoy the summer.  Have you been doing any >>> flying?  Do you have any flying videos posted? >>> >>> Will >>> >>> On 6/16/2022 9:33 PM, >>> craig.andrews@tessol-inc.com wrote: >>> >>> Hi Will, >>> >>> I am just checking back to see if you >>> are ready for your 38P70 board.  I have >>> the last of the components and can send >>> it any time.  It is still running the >>> original clock code, someone is pushing >>> me to get the STD-85 board done and >>> tested so I haven’t gotten back to the >>> this code.  I have your address from >>> your letter enclosed with the items you >>> sent me.  Let me know if you would like >>> any of my other bare boards. >>> >>> It keeps mediocre time, the crystal I >>> have runs about a minute ahead every few >>> weeks.  Other than that, it is a joy to >>> have here on my desk giving me a little >>> beep every minute.  Thanks again for >>> getting me into this project. >>> >>> I think in the next version of this >>> board I would like to have five little >>> pushbuttons arranged >>> center,up,down,left,right… I am thinking >>> there must be some sort of mindless game >>> that could be played with the 16 digits >>> of the display. >>> >>> Best regards >>> >>> Craig >>> >>> *From:* craig Andrews >>> >>> >>> *Sent:* Friday, May 06, 2022 7:28 PM >>> *To:* Will Halphen >>> >>> *Subject:* Re: 3870 project >>> >>> Thanks for the update.  Just let me know >>> when you are ready for the board. I ran >>> out of supervisory IC and the rotary >>> switches which will be here in 3 or 4 >>> days.  Also the real time clock which I >>> expect to show up sometime this week too. >>> >>> Regards >>> >>> Craig >>> >>> >>> >>> >>> >>> >>> >>> >>> On May 6, 2022, at 2:18 PM, Will >>> Halphen wrote: >>> >>>  >>> >>> Hi Craig, >>> >>> I think it’s all correct to the >>> extent I’m aware of the history – >>> which isn’t much.  I sent notes to >>> some of my old Mostek buddies to >>> take a look and asked for any >>> additional information they may be >>> able to provide.  I watched the rest >>> of the videos and look forward to >>> seeing the working hardware.  Sorry >>> to hear that one of the chips was >>> bad.  But’s that’s to be expected >>> for old components.  I have more of >>> the chips and can send you some if >>> needed.  My fear was that all of >>> them would be bad.  I’m glad that’s >>> not the case. >>> >>> I’ll be leaving next week to move my >>> daughter to North Carolina – she >>> just graduated from University of >>> Michigan Engineering and will be >>> working in Raleigh-Durham area.  >>> After that I will be going to my >>> house in Louisiana for 2-3 weeks, >>> but will be accessible via email. >>> >>> I hope you have a nice time away for >>> the summer! >>> >>> Will >>> >>> *From:* craig Andrews >>> [mailto:craig.andrews@tessol-inc.com >>> ] >>> *Sent:* Friday, May 06, 2022 1:55 PM >>> *To:* Will Halphen >>> *Subject:* Re: 3870 project >>> >>> Hi Will, >>> >>> Thanks for the feedback on the >>> video.  I hope I got most of the >>> history of the 3870 correct, not >>> just yours but Fairchild/Mostek >>> 3850/3870 in general. >>> >>> I still have one more F8 video that >>> is already recorded that needs >>> editing and then I will be caught >>> up.  It is a bring up of the >>> hardware.  I still some testing and >>> have lots of software to write, but >>> the basic boards seem to work fine. >>>  Since you can program 2716s I can >>> just send you software updates as I >>> go along and figure out how to do >>> things on the F8.  I haven’t talked >>> to the RTC yet and I have serial out >>> but haven’t done serial input. >>>  Right now my F8 assembly is pretty >>> amateurish but (I hope) getting better. >>> >>> Of the two 3870s you sent I randomly >>> picked one to put in the first board >>> after I had completed rudimentary >>> checks and taken all preliminary >>> precautions.  The board fired up >>> right away and successfully ran my >>> test code.  Later I assembled your >>> board and put in the second >>> processor which turned out to be non >>> functional.  I am really glad that I >>> randomly picked the functional >>> processor first, because I would >>> have been extremely hesitant to plug >>> in the second processor if the first >>> one hadn’t worked.  A month or so I >>> bought two more but they are coming >>> from Portugal I think so will be in >>> shipping for weeks. >>> >>> I certainly will be making another >>> version of this board to refine some >>> things to make the software easier. >>>  Mostly moving pins.  But right now >>> I do not have another pcb order >>> planned and I hope to be away much >>> of the summer, so the next round may >>> not be for a few months. >>> >>> If you or your Mostek friends have >>> any more history to add for the >>> videos, it would be appreciated. >>> >>> Thanks again for getting me started >>> on this project >>> >>> Regards >>> >>> Craig >>> >>> >>> >>> >>> >>> >>> >>> On May 5, 2022, at 9:01 PM, Will >>> Halphen wrote: >>> >>>  >>> >>> I just watched the first of your >>> F8 videos.  Excellent job!  The >>> historical background was >>> great.  I really enjoyed it and >>> look forward to watching the >>> rest of the videos.  I also >>> can’t wait to let my old Mostek >>> buddies know about this project. >>> >>> Thanks. >>> >>> Will >>> >>> *From:* >>> craig.andrews@tessol-inc.com >>> [mailto:craig.andrews@tessol-inc.com >>> ] >>> >>> *Sent:* Tuesday, May 03, 2022 >>> 9:26 PM >>> *To:* 'Will Halphen' >>> >>> *Subject:* RE: 3870 project >>> >>> Hi Will, >>> >>> I wanted to also check if you >>> still had a 38P70, hopefully I >>> will have a board to send you >>> soon.  I will populate >>> everything else on the board and >>> include an eprom so you will >>> just need to plug in a 38P70. >>> >>> How are your F8 programming skills? >>> >>> Regards >>> >>> Craig >>> >>> *From:* Will Halphen >>> >>> *Sent:* Wednesday, April 20, >>> 2022 4:29 PM >>> *To:* craig.andrews@tessol-inc.com >>> *Subject:* RE: 3870 project >>> >>> Hi Craig. >>> >>> Yes, I can program 2716 EPROMS >>> and I have a boatload of them. >>> >>> I’m looking forward to the videos! >>> >>> Lately I’ve been working on a >>> radio receiver design.  But it >>> would be good to shift focus to >>> a digital project for a while. >>> >>> Regards. >>> >>> Will >>> >>> *From:* >>> craig.andrews@tessol-inc.com >>> [mailto:craig.andrews@tessol-inc.com >>> ] >>> >>> *Sent:* Wednesday, April 20, >>> 2022 7:25 PM >>> *To:* 'Will Halphen' >>> >>> *Subject:* RE: 3870 project >>> >>> Hi Will, >>> >>> I hope all is going well on your >>> end. >>> >>> Are you able to program 2716 EPROMS? >>> >>> Taxes are done, wife has mostly >>> healed so I am getting back to >>> working the 38P70 project.  I >>> need to finish up and post the >>> project introduction video, I >>> will set that for this week’s >>> goal.    Since it will use a >>> 2716, I wanted to make sure that >>> you can program them.  I have >>> settled on a real time clock >>> with some 15 segment intelligent >>> displays (DL2416), a serial >>> port, a RTC chip, switch input, >>> LED, speaker output. >>> >>> Best regards >>> >>> Craig >>> >>> *From:* Will Halphen >>> >>> *Sent:* Saturday, February 19, >>> 2022 8:54 AM >>> *To:* 'craig Andrews' >>> >>> *Subject:* RE: 3870 project >>> >>> Hello Craig, >>> >>> Glad you received the package >>> ok.  I’ve seen photos of both >>> styles of those 38p70 chips in >>> commercial products.  So I don’t >>> know if they came out at the >>> same time or if one came after >>> the other.  The Mostek >>> documentation does state that >>> the 3874 was renumbered to >>> 38p70.  My guess is that the >>> 3874 came out first and that the >>> cerdip package of the 38p70 >>> became more common in the >>> industry, so the 3874 got >>> dropped.  My friends were >>> involved in manufacturing and >>> testing of chips.  (I think it >>> was typical that new engineers >>> were put in testing roles.) So >>> they probably sent me whatever >>> was surplus at the time.  I have >>> lots of Mostek chips that are >>> not labeled but were surplus >>> after the chips were tested.  >>> For example, I have a set of >>> unlabeled 8K rams in a box with >>> a note from my friend stating >>> that they were successfully >>> tested for 3000 hours at 125 >>> degrees.  I have another Mostek >>> z80 processor with the lid held >>> on by scotch tape.  I don’t know >>> the background on the 38p70 >>> chips.  I have no guarantee that >>> all of these chips will work.  >>> That’s why I sent you four >>> 38p70s. Hopefully all are good. >>> But, in case you find a bad one, >>> there are spares. >>> >>> I have a few unmarked (or hand >>> labeled) piggyback processors >>> that were clearly used for >>> testing.  I recall expressing >>> that I was interested in that >>> chip, so I was sent a couple of >>> tubes of the labeled chips. >>> That’s where yours came from.  >>> So I suspect these were likely >>> engineering samples. >>> >>> L J Sevin was one of the >>> founders of Mostek.  He was also >>> a native of my home town, Baton >>> Rouge, and graduated from LSU >>> Electrical Engineering. That’s >>> where I went to school.  So >>> Mostek regularly recruited from >>> LSU and many of many classmates >>> (and I) were able to visit >>> Mostek and received job offers.  >>> I was already having a great >>> time working part time at Dow >>> Chemical so I didn’t accept the >>> offer from Mostek, but a number >>> of classmates did. >>> >>> I have no other documentation >>> for the PLS-441.  I spent some >>> time searching the internet and >>> found nothing.  Herb Johnson >>> sent me the pinout document.  I >>> don’t think it’s necessary to >>> recreate a schematic in order to >>> run the board.  The pinout >>> should give enough information >>> to determine how to connect to >>> it.  And I’m guessing that Intel >>> application information can be >>> found for the 4040 chipset >>> showing the typical >>> interconnections and how to use >>> it.  Of course, be wary of the >>> 40 year old capacitors. >>> >>> This morning I watched your >>> latest video on the early Intel >>> development systems. Nice >>> video!  It brought back lots of >>> memories.  When I went fulltime >>> at Dow, they let me buy the >>> Intellec Series II MDS model 225 >>> with a memory expansion and an >>> additional pair of floppy >>> drives.  It was better than any >>> development system I had used in >>> school and better than the older >>> Intellec and S100 systems used >>> in the labs at Dow.  And the >>> floppy drives sure beat the >>> paper tape the other systems >>> were using.  A coworker and I >>> stayed late one evening and ran >>> a twisted pair thru the attics >>> and cable trays across the >>> facilities and connected it to >>> the PDP-11 that was used as the >>> main time share system for R&D.  >>> Also connected a 300 baud >>> modem.  So I had, by far, the >>> best development system/ >>> terminal in the facilities.  The >>> MDS came with a complete set of >>> schematics and firmware >>> listing.  So I got to know that >>> system very well.  I even took >>> out the original green CRT (the >>> tube itself) and replaced it >>> with an amber tube.  I did lots >>> of fun development using >>> Assembler and PL/M and could >>> even connect via modem from >>> home.  (My boss had never heard >>> of the concept of doing software >>> work from home with a remote >>> terminal and at first objected – >>> but later relented.) >>> >>> We setup a second development >>> system next to mine (I think it >>> was a WinSystems unit which also >>> used the same Intel bus).  We >>> installed processor emulators in >>> both systems and were able to >>> develop some dual processor >>> instruments, with each >>> development system running the >>> emulator for one processor.  At >>> the time Intel produced the >>> Universal Peripheral Interface, >>> 8741. It was an MCS-48 family >>> processor setup for use as a >>> slave.  Using that chip we >>> designed smart STD peripheral >>> cards for our instrument >>> systems.  For example, an 8741 >>> was used to offload the user >>> interface from the main processor. >>> >>> I still can’t believe I was paid >>> to have so much fun. >>> >>> I hope you enjoy the stuff I >>> sent. And keep the magic smoke >>> inside the chips! >>> >>> Will >>> >>> *From:* craig Andrews >>> [mailto:craig.andrews@tessol-inc.com >>> ] >>> >>> *Sent:* Friday, February 18, >>> 2022 11:22 PM >>> *To:* Will Halphen >>> >>> *Subject:* Re: 3870 project >>> >>> Hi Will, >>> >>> Received the boards and chips >>> today.  The 38p70s should make >>> an interesting video. >>> >>> So your friends sent you both >>> the prototypes and finished >>> chips at the same time >>> >>> Is there a schematic anywhere >>> for the pls 441 that you know >>> of? or should I create a schematic. >>> >>> I forgot to mention when you >>> sent the scanned 881 schematic >>> that on your board they did not >>> have that odd cap to the tank >>> circuit on the 8225 clock.  And >>> they had a jumper to eliminate >>> the trim cap on the crystal >>> input (which is funny since the >>> user could just take the trim >>> cap out and put jumper in its pads) >>> >>> Thanks again, I will keep you >>> updated >>> >>> Best regards >>> >>> Craig >>> >>> On Feb 17, 2022, at 4:28 PM, >>> Will Halphen >>> wrote: >>> >>>  >>> >>> Interesting that you enjoy >>> flying. I’ve always had a >>> desire to learn to fly, but >>> never pursued the interest. >>>  It must be a very enjoyable >>> activity! >>> >>> I’ve got several design >>> projects underway at the >>> moment.  Each project goes >>> on hold once I determine the >>> parts I need to order.  When >>> I have order lists from >>> several projects I’ll place >>> the orders for the parts.  >>> Similarly, I wait and order >>> PCBs for several projects at >>> a time.  So my projects can >>> take a long time, but I’m >>> regularly completing some. >>> Anyway, today I was working >>> on a hexadecimal display >>> module.  I have a tube full >>> of seven segment LED >>> displays that someone gave >>> me at the local amateur >>> radio swap meet.  The tough >>> thing is getting HEX >>> decoders for seven segment >>> displays.  The only chip I >>> know of is the MC14495 and >>> it seems to no longer be >>> available in North America – >>> except from  a few >>> scalpers.  So I’m proceeding >>> with a design using an >>> ATTINY processor feeding the >>> display characters via shift >>> registers with latches.  One >>> of the nice things about it >>> is the processor can be >>> setup to handle a variety of >>> interfaces – even the STD >>> bus.  The vintage tech is >>> nice and familiar.  But the >>> modern stuff is pretty >>> flexible.  This is an >>> amazing time to enjoy >>> electronic design! >>> Incredibly capable devices, >>> cheap components, powerful >>> tools, and easy made to >>> order PCBs and 3D printed >>> items.  (However, I do have >>> a few projects on hold >>> because of part shortages >>> lately.) >>> >>> Will >>> >>> *From:* >>> craig.andrews@tessol-inc.com >>> [mailto:craig.andrews@tessol-inc.com >>> ] >>> >>> *Sent:* Wednesday, February >>> 16, 2022 3:19 PM >>> *To:* 'Will Halphen' >>> >>> *Subject:* 3870 project >>> >>> Hi Will, >>> >>> Regarding the bus >>> contention, I am more >>> worried about outputting >>> high on the port while held >>> low from the driving IC.  A >>> 1n270 forward biased towards >>> the driving chip will take >>> care of that….. the driving >>> chip can pull the port low >>> as needed, but if the port >>> is pulling the line low it >>> cannot sink from the driving >>> chip. The forward drop of >>> the 1n270 is small enough to >>> keep the logic low below the >>> threshold.  if I use a >>> resistor for protection I >>> would have trouble hitting >>> the 0.7V logic low >>> threshold.  with the input >>> pin properly set to logic 1 >>> and the driving TTL held at >>> zero the drop across your >>> 3.3K would be 1.75V under >>> best case and more likely >>> 2.2V.  so when reading the >>> 3870 it would always be a >>> logic 1. >>> >>> You spend your nice days >>> with a fly rod, I spend nice >>> days flying… so this is a >>> gloomy day hobby for both of >>> us. I live near Portland so >>> 6 months of gloomy is our >>> trademark. >>> >>> I see, it is the mostek SIO >>> documentation you need, so >>> we are in the same boat. I >>> have cut sheets for the >>> winsystems 7314 and user’s >>> manual for the versalogic >>> but I haven’t gotten around >>> to seeing if they are all >>> the same. >>> >>> What we need is the 7301 of >>> which I have the manual but >>> no board. >>> >>> Anchor has 8251As for a few >>> of dollars I think. >>> >>> As for your modern hybrid >>> STD, there is a fellow in >>> Alaska that is taking the >>> SBC-85 design and blending >>> it with a PIC or ardunio or >>> some other such thing. For >>> me, the vintage brings back >>> better memories than my time >>> spent with modern things, so >>> I prefer to stick with >>> vintage.  I do STM32 things >>> occasionally, but only on an >>> “as needed” basis. >>> >>> The patient is generally >>> well mannered and good >>> natured and after 40 years >>> of living with me she is >>> well deserving of a little >>> TLC.  (At least that is what >>> she is telling me :). >>> >>> Best regards, >>> >>> craig >>> >>> *From:* Will Halphen >>> >>> *Sent:* Wednesday, February >>> 16, 2022 10:55 AM >>> *To:* 'craig Andrews' >>> >>> *Subject:* RE: PLS-881 >>> >>> Regarding input protection, >>> it may be helpful to put >>> series resistors to limit >>> the current in the event >>> that you output low to a >>> high input.  The datasheet >>> indicates that these pins >>> can handle 1.6 mA, so that >>> would be a 3.3K resistor.  >>> If the resistors cause any >>> problems, you can replace >>> them with jumpers. >>> >>> Yes, do some SBC-85 work >>> first.  I don’t see a need >>> for any rush on any of >>> this.  I live in Michigan, >>> and the winter is long >>> here.  So I get lots of time >>> to work on this stuff at >>> this time of year.  But once >>> spring comes along (in a few >>> months), I’ll be spending >>> more time on the rivers with >>> a fly rod. >>> >>> I hope all goes well with >>> your patient.  Good luck >>> with your nursing duties. >>> >>> As for the serial board, I >>> would like to bring up one >>> of my STD Z80 boards and >>> want to use a serial port.  >>> The only serial board I have >>> is the Mostek MDX-SIO.  And >>> that’s the only one of my >>> Mostek boards missing the >>> documentation.  The prolog >>> 7314 is probably the same as >>> the Versalogic 7314 which >>> has documentation and a >>> schematic available online. >>>  But it’s a bit overkill for >>> what I want.  I’m thinking >>> that I will first design an >>> STD prototype card with I/O >>> decoders in place. That >>> would be a handy design to >>> share with others.  Then >>> I’ll clone the design, >>> remove the prototype area, >>> and put in a uart with one >>> serial port.  I’ll include a >>> uart to usb circuit on board >>> so I can just plug it into a >>> notebook computer as the >>> terminal.  Now I have to >>> find a uart chip that is >>> readily available and not >>> too costly.  I’m not >>> familiar with what’s in >>> production these days. I >>> have some old 8251 chips, >>> and one company still makes >>> them, but the cost is high.  >>> Let me think on this a >>> while.  If I decide I want a >>> prebuilt one, I may take you >>> up on your offer of the 7314. >>> >>> (It’s interesting how I keep >>> coming up with modern >>> solutions for these old >>> challenges.  I keep thinking >>> that I could do the whole >>> serial IO design with just a >>> single $3 PIC >>> microcontroller.  Then I >>> would have SPI and I2C, as >>> well.  Could that be a >>> thing?  An 8085 STD card >>> with a bunch of PIC >>> microcontrollers on STD >>> cards as peripheral >>> controllers. It would be >>> pretty easy and could still >>> run 8085 code and CPM.) >>> >>> Will >>> >>> *From:* craig Andrews >>> [mailto:craig.andrews@tessol-inc.com >>> ] >>> >>> *Sent:* Wednesday, February >>> 16, 2022 12:41 PM >>> *To:* Will Halphen >>> >>> *Subject:* Re: PLS-881 >>> >>> Hi Will, >>> >>> Thanks for the update >>> >>> Yes, I noticed the serial >>> version, it looks like the >>> -73 version has a full UART >>> and baud rate generator >>> inside.  I read an AP note >>> just a day or so ago that >>> was dedicated to nested >>> calls and I don’t think that >>> will become a limiting >>> factor.  As I read it, your >>> version of the chips has the >>> executable RAM in addition >>> to the scratchpad.. so that >>> is nice. >>> >>> if I am reading everything >>> right, your chips have light >>> pull ups on the outputs (6k >>> as I remember).  I am >>> wondering if I should >>> protect devices driving the >>> input pin from contention >>> since I am sure to mess up >>> and output those as low bits >>> sooner or later.  I guess I >>> could drive the input pins >>> with open collector, at >>> first blush that looks like >>> it would solve the problem. >>>  Or I could put in a signal >>> diode, I need to see what >>> fits better after I start >>> assigning pins. >>> >>> I will ruminate on the >>> design a but… I may slip the >>> STD SBC-85 board in first. >>> >>> The Mrs is having footwork >>> done so she will be in >>> dry-dock for several weeks >>> and I will be her >>> manservant—so the next >>> couple of weeks will be full >>> of interruptions whenever >>> she rings her little call >>> bell.  Things should free up >>> in a few weeks, unless one >>> of us kills the other I suppose. >>> >>> Did I see you were looking >>> for a Mostek SIO? I am >>> pretty sure that I have one, >>> but never found >>> documentation and I haven’t >>> bothered reverse capturing. >>>   If I have one and you want >>> it, it’s yours.  Or I have a >>> prolog 7314 UART if you >>> prefer but, again, I don’t >>> think it has a schematic and >>> haven’t gotten around to >>> capturing one. >>> >>> Best Regards >>> >>> Craig >>> >>> On Feb 16, 2022, at 9:01 >>> AM, Will Halphen >>> wrote: >>> >>>  >>> >>> Craig, >>> >>> I’m ok with you >>> mentioning my name on >>> your videos.  And OK >>> with you mentioning that >>> I obtained the chips >>> from some college >>> buddies who worked at >>> Mostek.  These were >>> commercially available >>> chips. I’ve been reading >>> about the MK38P70. It >>> has some interesting >>> features.  It has no >>> stack, but it has a >>> single level buffer of >>> the program counter so a >>> subroutine can be >>> called.  However, if you >>> want to nest >>> subroutines, you have to >>> create and maintain a >>> stack. This is made >>> easier because of the >>> scratchpad RAM which is >>> accessible in a single >>> processor cycle.  This >>> F8 guide has a lot of >>> helpful information and >>> suggestions for using >>> this processor. >>> http://www.bitsavers.org/components/fairchild/f8/67095664_F8_Guide_To_Programming_1976.pdf >>> >>> There was another >>> version of this chip >>> that included a serial >>> port.  I checked my >>> collection and I think I >>> have one of those.  But >>> it has no printed >>> markings, only a hand >>> written part number in >>> pencil.  So it was >>> likely a chip used for >>> testing purposes at Mostek. >>> >>> This LLL BASIC code >>> seems to be setup for >>> use with the CPM BIOS.  >>> It has addresses defined >>> for several drivers, >>> such as console in and >>> console out.  Of course, >>> if you don’t want to use >>> it with CPM, the ROM >>> just needs to have >>> drivers for the console >>> and these addresses need >>> to be changed to the >>> addresses of the drivers >>> in the ROM. LLL BASIC >>> should work with only >>> the console in and >>> console out drivers.  So >>> redefine the driver >>> addresses in the code, >>> update the EQU >>> statements to define the >>> RAM location, assemble >>> it and load it to >>> EPROMs, and it should >>> run.  After that you can >>> modify the code, add >>> your own keywords and >>> functions, and have your >>> own custom version of BASIC. >>> >>> The tracking number for >>> your package is >>> 1Z1EE6650348537027 >>> (UPS).  No need to >>> reimburse me for the >>> shipping.  I may call on >>> you someday for some >>> parts or assistance.  >>> I’m just glad to have >>> these parts go to >>> someone who can do >>> something with them – >>> other than grind them up >>> for gold – and >>> potentially help others >>> to learn about the >>> evolution of >>> microprocessors. >>> >>> Will >>> >>> *From:* >>> craig.andrews@tessol-inc.com >>> [mailto:craig.andrews@tessol-inc.com >>> ] >>> >>> *Sent:* Tuesday, >>> February 15, 2022 9:06 PM >>> *To:* 'Will Halphen' >>> >>> *Subject:* RE: PLS-881 >>> >>> Thank you Will, again >>> this is very much >>> appreciated and let me >>> know how I can pay back >>> your generosity. It >>> seems at least I should >>> pay for shipping or send >>> you something I have >>> that you would like in >>> return.  Think STD or >>> Multibus and I probably >>> have something you could >>> use. >>> >>> I appreciate the scans >>> of the schematics and >>> documentation, I will go >>> through them this >>> evening.  I have been >>> porting my confidence >>> test over to the 881 and >>> stopped to make some >>> improvements, so I have >>> not gotten to looking >>> further at the LLL basic >>> project. >>> >>> As for the MK38P70 I >>> think I am settling in >>> to a system concept for >>> a first go around and, >>> as so often is the case, >>> I wound with a clock. >>> >>> Rather than the TIL311 >>> hex displays, I am now >>> thinking of using >>> DL2416s.  Like the TIL, >>> they offer aesthetics >>> matching the time >>> period, but they provide >>> the full alphanumeric >>> set so in addition to a >>> clock it can also be set >>> up as a scrolling text >>> display.  I am thinking >>> of 16 or 20 digits (4 or >>> 5 displays).  4 displays >>> will fit on the 100mm >>> square $1 board but >>> having 5 displays and up >>> to a 5” wide $2 board >>> will not break the bank. >>> >>> The MC146818 real time >>> clock came out in the >>> early 80s, so I planning >>> to include it on the board. >>> >>> A few switches with left >>> over input lines; and, >>> >>> A serial port.  I would >>> really like to use a >>> MAX232 but it didn’t >>> come along until well >>> later so that leaves me >>> with either 5V signal or >>> using the immortal >>> 1488/1489 set and >>> supplying +/- 12V. >>>   Sometimes I bend the >>> rules for convenience so >>> the MAX232 may win out >>> this time since nothing >>> else requires the >>> bipolar 12V. >>> >>> Just a barrel connector >>> for power in if I stick >>> with pure 5V.  the >>> DL2416s will pull more >>> than their share of current. >>> >>> I will do an >>> introduction video to >>> gauge the level of >>> interest for sharing the >>> project, the MK38P70 is >>> a unique enough platform >>> to draw some interest. >>> Since the MK38P70 is a >>> gift from you and you >>> are the reason behind >>> the project, with your >>> permission I would like >>> to give some background >>> on where the chips came >>> from. Please let me know >>> what I can share…. Or I >>> can just say “my new >>> buddy Will sent me an >>> idea and some chips…” >>> >>> Best regards >>> >>> Craig >>> >>> *From:* Will Halphen >>> >>> *Sent:* Tuesday, >>> February 15, 2022 2:07 PM >>> *To:* 'craig Andrews' >>> >>> *Subject:* PLS-881 >>> >>> Craig, >>> >>> I’m sending you a >>> package with the Prolog >>> PLS-881 and a PLS-441.  >>> I also included a few of >>> the MK38P70 chips.  I >>> opened the PLS-881 >>> package and scanned the >>> docs.  They are >>> attached.  You can >>> validate your reverse >>> engineering schematic.  >>> Also attached is the >>> specification doc for >>> the PLS-441.  This is >>> the only technical >>> documentation I’ve been >>> able to find on it. >>> >>> Regards. >>> >>> Will >>> --------------y1ihGZDaxLcFZl4Lsm00hlUA Content-Type: multipart/related; boundary="------------zJwhgno06rdkr8rTyWZxw5YP" --------------zJwhgno06rdkr8rTyWZxw5YP Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Sorry Craig.  I don't.  I never ventured into the 6800 space.

Will


On 3/7/2023 11:49 PM, SBC-85 wrote:
Hi Will, 

You wouldn’t happen to have the schematic or any documentation for one of these Pro-Log PLS 868. 6800 card would you?

Pro-Log PLS-868 c.JPG

On Mar 6, 2023, at 10:47 AM, whalphen <whalphen@gmail.com> wrote:



I saw your video on the card guides and cooling plenum.  Nice job!  I already have a couple of backplanes and I have card guides.  So won't need more.

I hope things are going well for you.  Do you have any fun projects underway? 

Here's an update on the projects I'm currently working on.  (Several more in the queue, though.) 

My EPROM programmer is progressing well.  It will have two PCBs, stacked.  The first one is the power supply and controller board.  It's got multiple switching converters to produce various voltage levels.  The first PCB was made and is now being tested.  The power converters all work.  I opted to put an Arduino Pro Mini on board as the microcontroller -- because it's cheap and readily available.  I only had 3.3 volt versions and expect some 5 volt versions to arrive this week.  Then I'll continue testing.  The processor will be able to enable/ disable each power supply individually.  It will also be able to measure and adjust the voltage level on each.  The plan is to use the power supply board with various EPROM socket modules.  The first will be a 1702A programmer.  I have the PCB designed and it will be sent with my next PCB batch order.  Next step is the software.  I'm working on a GUI to run on Windows to control the programmer via a USB connection.  I hadn't used Visual Studio in a few years and I found that the latest version doesn't seem to have the control for interfacing via serial ports anymore.  They've also greatly complicated the procedure for creating a standalone software product, i.e., a .exe file.  So I ended up rolling back to an earlier version.  Now I'm remembering why I never liked using Microsoft tools.

I had a group of students request a design for a noise cancelling circuit for headphones.  It's just a simple analog circuit and seems to be working.  It's not as good as Bose noise cancelling, but it meets their needs as a demonstration as part of a medical product they're designing for a competition.  They also need an inverter circuit to produce about 35 volts AC from a 9 volt battery.  This will be used for controlling the opacity of a plastic lens for the same project.  I designed and built a circuit for them.  It works on my workbench.  We'll test it on the lens this week.

I guided a student through the construction of a reflow oven using a design I did a few years ago.  It's working and she was able to successfully reflow a test board.

Another student is working on a Cyclic Voltameter as a project for a class she is in.  I had never heard of this until I looked it up.  It's a pretty interesting analytical chemistry technique.  I made some improvements to her circuit and designed a PCB.  Now she is testing it and starting to get some good results with her probe.  (With my town being the global headquarters of Dow Chemical, we get a lot of students interested in chemistry.  Especially if they have a PhD chemist or two in the family.)

These projects have been keeping me from completing my GPSDO design.  But I've confirmed all the parts and dimensions and tested major parts of the circuit.  Next I will be doing the PCB layouts.

So far it's been a busy winter -- though I did find time to spend a few weeks on the gulf coast.

Regards.

Will

On 3/6/2023 2:27 AM, craig@sbc-85.com wrote:

Hi Will, I hope all is well.

 

I forget, I know you made one also, but did I send you a STD backplane?  I now have card guides for the backplane and if you would like I can send you a backplane and a set of card guides.  I can print a cooling plenum too if you are running anything that gets hot enough to need it.

 

Just let me know what color you would like and I can print them and send them out to you.

 

Best regards

 

Craig

 

From: whalphen <whalphen@gmail.com>
Sent: Thursday, July 28, 2022 10:41 AM
To: SBC-85 <craig@sbc-85.com>
Subject: Re: 38P70 clock and companions

 

Hi Craig.  Wow!  Nice job on the documentation!

I don't need a new project -- but this one looks good enough to bump some other project off my list.  So yeah, I'll plan on building this.  I don't have all my old 74LS chips in my online inventory, so I'll need to manually check them against your BOM and get any missing parts on order.  (Actually I recently organized all my old chips, so I might as well get them into the database while I'm at it.  I've been using PartsBox for a few years.  It's been a great help in managing the parts inventory -- especially for all the kits we use with the school groups.  If you haven't seen it, check it out.  Jan Rychter has done an excellent job developing and commercializing the product.  He's also a nice guy, readily accessible and responsive if any problems.  And best of all, you can use the software for free.  I think there is a stated limit on the number of parts you can track for free, but he doesn't enforce that limit.)

I did some programming of the 38P70.  Your video on setting up the assembler was very helpful.  And the software you provided was great to get me back into the assembly language programming mindset.  I used the internal counter to create a 1 KHz timebase and intend to try using the LM331 V to F converter to do some analog measurement.  I had trouble getting the LM331 chip -- the US suppliers distributors are all out of stock.  I received some from AliExpress, but they turned out to be fake.  I managed to get some from Newark's UK stock.  Now I just need to wire them up. 

Interestingly, Newark also showed stock on some Microchip components I need, but after I placed the order, they sent an email stating that they would not send the Microchip parts.  Apparently Microchip has asked them to sell only to certain commercial customers -- and that doesn't include me.  Unfortunately Microchip has bought up many of the other manufacturers over the past few years, so that means many chips are no longer readily available to individuals.  I did notice that non-commercial customers can can still place orders directly with Microchip, but the shipments are from Thailand and the cost of shipping is high.  So it's a deal breaker unless I place a large order.

I've been working on building a programmer for 1702A eproms.  I have some PIC microcontrollers and tried using one to act as a boost converter.  It worked, except that it doesn't have quite the timing resolution I need for the PWM.  And the ones that do are not available.  So I decided to just use boost converter chips and select specific voltage levels directly from the microcontroller's GPIO pins.  My objective is to leverage the same design as a voltage source for another programmer for 8748 processors.  But, again, I'm having trouble sourcing parts.  The shortages are affecting even some mosfets.  Oh well.  I have enough parts on hand to breadboard the boost circuits.  I'll look for alternative mosfets in the meantime.  I obtained some of them from AliExpress and they are actually functional -- but don't know if they will meet the specs stated in the datasheets.  AliExpress seems to be a reasonable source for passive components, but I've had too many bad experiences with silicon I've purchased there in the past couple of years.  But I've always been able to easily get a refund for the bad stuff.

I typically have multiple projects going in parallel.  So I switched projects and built a VHF power amp that I had on the back burner.  And also a HF power amp.  And got some more work done on a couple of antenna projects.  I'm starting to think that I'm spending just as much time on the task switching as on the projects themselves!

Thanks for updating me on the status of the documentation for the 8085 STD card.  It'll be good to put some of my old STD stuff to use again.  Vintage chips may end up being the only feasible option if the semiconductor shortages continue!

Regards.

Will

On 7/27/2022 10:52 PM, SBC-85 wrote:

Hi Will

 

I have been working on the STD board this week and the documentation.  So far the board looks good if you need a new build project.

 

 

Regards

 

Craig



On Jun 23, 2022, at 9:15 AM, whalphen <whalphen@gmail.com> wrote:



Thanks Craig.  Good job with the code.  It's been a few years since I've done any assembly language programming.  C and C++ have spoiled me.  It's always helpful to have some working routines as a base to build on.  I'm not one to be critical of others' coding.  If it works it's good.  Of course there are always opportunities to change and improve code -- and I always appreciate when I find some code I can improve on.  One of the fun things about assembly language programming on processors from the early years is when I stumble across a way to save a byte or two of ROM or RAM.  On modern systems, there just isn't much satisfaction in saving memory or cycles when the system runs 100 times faster than necessary and has many kilobytes unused anyway.

I do not have a programmer for the 8755.  I never used that chip.  The designs I worked on used the 8742, which was basically added a slave MCS-48 processor core to the 8755.  However, I don't have a programmer for the 8742 either.  In our old instrument development workshop, we had a couple of Intellec development systems.  One had an 8085 emulator in it.  The other had an 8742 emulator in it.  Our STD designs used the 8085 as the main processor.  And we offloaded the user interfaces to an 8748 STD board that we custom designed.  Debugging of the software involved two people -- one running the 8085 emulator and the other running the 8742 emulator.  We also used our own STD board design for actuating valves, mixers, and other devices.  And we developed some measurement instruments that would plug into the STD bus.  For example, we designed a colorometer that used a fiber optic probe to pass a light of a specific color through a sample stream to detect the presence of specific chemicals.  By offloading some of the work to the 8748, we could do more data processing on the 8085.  It was loads of fun!  And we got paid for it!

Although I think it would be fun to play with a minimal 8085 system -- I've always kicked around the idea of building one -- I'm not currently setup for it.

Will

On 6/22/2022 7:55 PM, craig@sbc-85.com wrote:

Hi Will

 

I have attached a zip file with the clock code.  Renamed in case your antivirus or a server along the way takes issue with a *.bin file.

 

I am using the dasm assembler.  Included in these is a txt file that is the command line usage for that assembler.  I have had a wave of people asking for a video on setting up to program the F8.  For my channel, two requests is a wave, any more and it is a tsunami.   So such a video is in the concept stage.

 

I forget my last bit of work with this and am 99% sure this is the latest code that is what I sent you,  I know code should stand on its own, but let me look through the code and call forth the wisdom genie to hand out useful pieces of advice----

  1. All of the commented out PI subroutines was for diagnostics and no longer serve a purpose
  2. You can see that I use the SET pseudo opcode frequently to provide a local assignment to registers.  I am not sure if I even tested this assembler to see if it gives errors if I try to redefine after using the EQU pseudo opcode but that is my policy…..  EQU for things defined once, SET for throwaway definitions.
  3. The current state of port 0 and 5 are kept in registers.  When modified the register value is changed and then sent out to the port rather than changing directly.
  4. I am working on wiping out all of the initial clock set code and just have it come up with the saved time.  If the user wants to change they can then enter a change mode.
  5. I thought I just commented out the serial port output for the splashscreen and the input test but I do not see them at all.  But the CI and CO routines have been tested and were working.  1200 baud it says but I may have been tweaking the delay values and not gotten back to updating the comment.  So maybe 2400 but probably 1200.
  6. The main loop is, as expected, the WAIT: portion of the code and it is called out by an interrupt to flip the LED.
  7. All calls are only one deep so there is a noticeable essence of the 8008 and other stackless devices.
  8. If you think this code is embarrassingly amateurish, you should have seen my first attempt.  This *is* the improved version.

 

If you have any questions about why I did something how I did it, please ask.  We can then try to figure it out together.

 

I am thinking of reissuing an old board I made that is essentially the intel MCS-85 3-chip minimum system that they put in all their MCS-85 data books.  I haven’t bothered with this board since very few can program the 8755.  How about you? can you program 8755s and would have a interest in such a board?

 

I am also thinking of resurrecting another version that has two 8155s and two 8755s so, except for the 8279 keyboard/display controller (and keypad and display) it basically has the same functionality as a SDK-85.  A terminal is much easier to use than the keyboard/display on the SDK which is why I didn’t bother with a keypad.

 

Regards

 

craig

 

 

From: whalphen <whalphen@gmail.com>
Sent: Wednesday, June 22, 2022 3:01 PM
To: SBC-85 <craig@sbc-85.com>
Subject: Re: 38P70 clock and companions

 

Hi Craig,

I tried the MK38P70 board.  It's nice to see a processor run after being stored away and forgotten for four decades!  My first order of business was to check each of the chips I have.  Here's my results. 

Of the labeled ceramic chips, 4 seem to work fine.  2 were bad.  And one would run, but some of the displayed letters were garbled. 

I have four ceramic chips with no markings.  One of them was non-functional.  Three displayed HELLO WORLD but would not branch into the clock setup.  Perhaps these are a different version of the chip that's not fully compatible with your program. 

Of the ones labelled as PACKAGE SAMPLE, 4 worked.  3 were non-functional, and one was labelled 2732 and I didn't test it.  

I have another couple of chips in a package that I didn't retrieve from storage and will test these later.

Some questions...

Can you give me a listing of the program you provided? How did you assemble the program?  Was it hand assembled or did you use an assembler?

Next I intend to set up an assembler and try writing a program.  If I can start with the program you wrote and modify/ extend it, that would be helpful.

Will

 

On 6/21/2022 9:11 PM, SBC-85 wrote:

Hi will

 

Yea, I wanted you to be able to get going quickly. 

 

… there is always the kitchen table if your bench isn’t clear. Who could complain about the worlds first microcomputer?




On Jun 21, 2022, at 5:39 PM, whalphen <whalphen@gmail.com> wrote:



Hi Craig,

I received your package today.  I was pleasantly surprised to see all that you put in there.  Thank you very much!  I can see that I won't run out of things to play with anytime soon.  Now I need to go clear the stuff off my workbench so I can try out the 38P70 tomorrow!

Will

On 6/17/2022 3:47 PM, craig@sbc-85.com wrote:

Hi Will,

 

All boxed up and ready to go.  USPS tracking number ----

 

9405511108033825465675

 

 

The STD board works and has been tested at a minimal level.  I need to do some more extensive testing with the memory mapping to have a wider combination of standard and auxiliary configurations, but it works with everything I have tried so far.  I really like not having fixed configurations on the memory sockets and being able to use the ZIF for high memory while using a resident monitor in a base EPROM, or moving the ZIF to 0x0000 if I want to work on the resident monitor program and have it easy to pop in and out.  As always, lots of documentation and software to write and I want to test it with EEPROMs but need to write code first.   I also have not even started testing the STD interface so I need to put it in a cage and start adding other boards.

 

Thanks for the video feedback and encouragement.  I don’t think that I will influence many of those raised on JTAG to disconnect their super-tool and go back to old-school diagnostics, but I hope to do my little part.  I am getting anxious to start getting my intellect 8/80 boards up.  Not that every grandmother will want to build an intellect 8, but there is a lot of history there.

 

Summer has not started here yet.  A bit of flying but not as much as usual for this time of year.  I always have projects at home, so never any time to roam the bars or otherwise cause trouble.  There are already a lot of flying videos so I don’t think I have a lot to contribute there.  What I may do is some geology of the pacific northwest flying videos since we live in a pretty amazing area geology wise and it can be beautiful from the air.  This is an amazing part of the country by any measure, but especially the story about how the pacific northwest came to be. 

 

Best regards,

 

craig

 

 

From: whalphen <whalphen@gmail.com>
Sent: Friday, June 17, 2022 7:14 AM
To: craig.andrews@tessol-inc.com
Subject: Re: 3870 project

 

Hi Craig.  I was traveling the last few weeks (Michigan to North Carolina to Alabama to Louisiana then returned via the same long route) but I managed to watch the 38P70 videos.  Good job!  I keep thinking how valuable your videos are in that they pull together a lot of relevant information from the past and preserve it for those who will be interested in the future.

I got back to Michigan in time for the start of the nice weather and have been spending time getting caught up on things at home.  I just finished re-installing my HF antennas, having removed them for some tree cutting last fall.

I am eager to try out the 38P70 board.  So yes, please send it.

Next month things will slow down around here and I'll be looking forward to spending time in my workshop in the cool basement constructing and testing some PCBs.  The last several years I've mostly done RF design and construction, gradually moving from analog designs to more digital signal processing.  But much of that is on hold now as the digital processors are all out of stock.  So the 38P70 will be a nice shift of focus.

What's the status of your STD bus 8085 processor board?  I'm thinking I would like to build one of those at some point.

I hope you are finding time to get out and enjoy the summer.  Have you been doing any flying?  Do you have any flying videos posted?

Will

 

On 6/16/2022 9:33 PM, craig.andrews@tessol-inc.com wrote:

Hi Will,

 

I am just checking back to see if you are ready for your 38P70 board.  I have the last of the components and can send it any time.  It is still running the original clock code, someone is pushing me to get the STD-85 board done and tested so I haven’t gotten back to the this code.  I have your address from your letter enclosed with the items you sent me.  Let me know if you would like any of my other bare boards.

 

It keeps mediocre time, the crystal I have runs about a minute ahead every few weeks.  Other than that, it is a joy to have here on my desk giving me a little beep every minute.  Thanks again for getting me into this project.

 

I think in the next version of this board I would like to have five little pushbuttons arranged center,up,down,left,right… I am thinking there must be some sort of mindless game that could be played with the 16 digits of the display.

 

Best regards

 

Craig

 

From: craig Andrews <craig.andrews@tessol-inc.com>
Sent: Friday, May 06, 2022 7:28 PM
To: Will Halphen <whalphen@gmail.com>
Subject: Re: 3870 project

 

Thanks for the update.  Just let me know when you are ready for the board. I ran out of supervisory IC and the rotary switches which will be here in 3 or 4 days.  Also the real time clock which I expect to show up sometime this week too.

 

Regards

 

Craig

 

<image001.jpg>

 

 






On May 6, 2022, at 2:18 PM, Will Halphen <whalphen@gmail.com> wrote:



Hi Craig,

 

I think it’s all correct to the extent I’m aware of the history – which isn’t much.  I sent notes to some of my old Mostek buddies to take a look and asked for any additional information they may be able to provide.  I watched the rest of the videos and look forward to seeing the working hardware.  Sorry to hear that one of the chips was bad.  But’s that’s to be expected for old components.  I have more of the chips and can send you some if needed.  My fear was that all of them would be bad.  I’m glad that’s not the case.

 

I’ll be leaving next week to move my daughter to North Carolina – she just graduated from University of Michigan Engineering and will be working in Raleigh-Durham area.  After that I will be going to my house in Louisiana for 2-3 weeks, but will be accessible via email.

 

I hope you have a nice time away for the summer!

 

Will

 

From: craig Andrews [mailto:craig.andrews@tessol-inc.com]
Sent: Friday, May 06, 2022 1:55 PM
To: Will Halphen <whalphen@gmail.com>
Subject: Re: 3870 project

 

Hi Will, 

Thanks for the feedback on the video.  I hope I got most of the history of the 3870 correct, not just yours but Fairchild/Mostek 3850/3870 in general.

 

I still have one more F8 video that is already recorded that needs editing and then I will be caught up.  It is a bring up of the hardware.  I still some testing and have lots of software to write, but the basic boards seem to work fine.  Since you can program 2716s I can just send you software updates as I go along and figure out how to do things on the F8.  I haven’t talked to the RTC yet and I have serial out but haven’t done serial input.  Right now my F8 assembly is pretty amateurish but (I hope) getting better.

 

Of the two 3870s you sent I randomly picked one to put in the first board after I had completed rudimentary checks and taken all preliminary precautions.  The board fired up right away and successfully ran my test code.  Later I assembled your board and put in the second processor which turned out to be non functional.  I am really glad that I randomly picked the functional processor first, because I would have been extremely hesitant to plug in the second processor if the first one hadn’t worked.  A month or so I bought two more but they are coming from Portugal I think so will be in shipping for weeks.

 

I certainly will be making another version of this board to refine some things to make the software easier.  Mostly moving pins.  But right now I do not have another pcb order planned and I hope to be away much of the summer, so the next round may not be for a few months.  

 

If you or your Mostek friends have any more history to add for the videos, it would be appreciated. 

 

Thanks again for getting me started on this project

 

Regards

 

Craig

 

 







On May 5, 2022, at 9:01 PM, Will Halphen <whalphen@gmail.com> wrote:



I just watched the first of your F8 videos.  Excellent job!  The historical background was great.  I really enjoyed it and look forward to watching the rest of the videos.  I also can’t wait to let my old Mostek buddies know about this project.

 

Thanks.

Will

 

From: craig.andrews@tessol-inc.com [mailto:craig.andrews@tessol-inc.com]
Sent: Tuesday, May 03, 2022 9:26 PM
To: 'Will Halphen' <whalphen@gmail.com>
Subject: RE: 3870 project

 

Hi Will,

 

I wanted to also check if you still had a 38P70, hopefully I will have a board to send you soon.  I will populate everything else on the board and include an eprom so you will just need to plug in a 38P70.

 

How are your F8 programming skills?

 

Regards

 

Craig

 

From: Will Halphen <whalphen@gmail.com>
Sent: Wednesday, April 20, 2022 4:29 PM
To: craig.andrews@tessol-inc.com
Subject: RE: 3870 project

 

Hi Craig.

 

Yes, I can program 2716 EPROMS and I have a boatload of them.

 

I’m looking forward to the videos!

 

Lately I’ve been working on a radio receiver design.  But it would be good to shift focus to a digital project for a while.

 

Regards.

 

Will

 

From: craig.andrews@tessol-inc.com [mailto:craig.andrews@tessol-inc.com]
Sent: Wednesday, April 20, 2022 7:25 PM
To: 'Will Halphen' <whalphen@gmail.com>
Subject: RE: 3870 project

 

Hi Will,

 

I hope all is going well on your end. 

 

Are you able to program 2716 EPROMS?

 

Taxes are done, wife has mostly healed so I am getting back to working the 38P70 project.  I need to finish up and post the project introduction video, I will set that for this week’s goal.    Since it will use a 2716, I wanted to make sure that you can program them.  I have settled on a real time clock with some 15 segment intelligent displays (DL2416), a serial port, a RTC chip, switch input, LED, speaker output.

 

Best regards

 

Craig

 

From: Will Halphen <whalphen@gmail.com>
Sent: Saturday, February 19, 2022 8:54 AM
To: 'craig Andrews' <craig.andrews@tessol-inc.com>
Subject: RE: 3870 project

 

Hello Craig,

 

Glad you received the package ok.  I’ve seen photos of both styles of those 38p70 chips in commercial products.  So I don’t know if they came out at the same time or if one came after the other.  The Mostek documentation does state that the 3874 was renumbered to 38p70.  My guess is that the 3874 came out first and that the cerdip package of the 38p70 became more common in the industry, so the 3874 got dropped.  My friends were involved in manufacturing and testing of chips.  (I think it was typical that new engineers were put in testing roles.)  So they probably sent me whatever was surplus at the time.  I have lots of Mostek chips that are not labeled but were surplus after the chips were tested.  For example, I have a set of unlabeled 8K rams in a box with a note from my friend stating that they were successfully tested for 3000 hours at 125 degrees.  I have another Mostek z80 processor with the lid held on by scotch tape.  I don’t know the background on the 38p70 chips.  I have no guarantee that all of these chips will work.  That’s why I sent you four 38p70s.  Hopefully all are good.  But, in case you find a bad one, there are spares.

 

I have a few unmarked (or hand labeled) piggyback processors that were clearly used for testing.  I recall expressing that I was interested in that chip, so I was sent a couple of tubes of the labeled chips.  That’s where yours came from.  So I suspect these were likely engineering samples.

 

L J Sevin was one of the founders of Mostek.  He was also a native of my home town, Baton Rouge, and graduated from LSU Electrical Engineering.  That’s where I went to school.  So Mostek regularly recruited from LSU and many of many classmates (and I) were able to visit Mostek and received job offers.  I was already having a great time working part time at Dow Chemical so I didn’t accept the offer from Mostek, but a number of classmates did.

 

I have no other documentation for the PLS-441.  I spent some time searching the internet and found nothing.  Herb Johnson sent me the pinout document.  I don’t think it’s necessary to recreate a schematic in order to run the board.  The pinout should give enough information to determine how to connect to it.  And I’m guessing that Intel application information can be found for the 4040 chipset showing the typical interconnections and how to use it.  Of course, be wary of the 40 year old capacitors.

 

This morning I watched your latest video on the early Intel development systems.  Nice video!  It brought back lots of memories.  When I went fulltime at Dow, they let me buy the Intellec Series II MDS model 225 with a memory expansion and an additional pair of floppy drives.  It was better than any development system I had used in school and better than the older Intellec and S100 systems used in the labs at Dow.  And the floppy drives sure beat the paper tape the other systems were using.  A coworker and I stayed late one evening and ran a twisted pair thru the attics and cable trays across the facilities and connected it to the PDP-11 that was used as the main time share system for R&D.  Also connected a 300 baud modem.  So I had, by far, the best development system/ terminal in the facilities.  The MDS came with a complete set of schematics and firmware listing.  So I got to know that system very well.  I even took out the original green CRT (the tube itself) and replaced it with an amber tube.  I did lots of fun development using Assembler and PL/M and could even connect via modem from home.  (My boss had never heard of the concept of doing software work from home with a remote terminal and at first objected – but later relented.)

 

We setup a second development system next to mine (I think it was a WinSystems unit which also used the same Intel bus).  We installed processor emulators in both systems and were able to develop some dual processor instruments, with each development system running the emulator for one processor.  At the time Intel produced the Universal Peripheral Interface, 8741.  It was an MCS-48 family processor setup for use as a slave.  Using that chip we designed smart STD peripheral cards for our instrument systems.  For example, an 8741 was used to offload the user interface from the main processor.

 

I still can’t believe I was paid to have so much fun.

 

I hope you enjoy the stuff I sent.  And keep the magic smoke inside the chips!

 

Will

 

From: craig Andrews [mailto:craig.andrews@tessol-inc.com]
Sent: Friday, February 18, 2022 11:22 PM
To: Will Halphen <whalphen@gmail.com>
Subject: Re: 3870 project

 

Hi Will, 

Received the boards and chips today.  The 38p70s should make an interesting video.

 

So your friends sent you both the prototypes and finished chips at the same time

 

Is there a schematic anywhere for the pls 441 that you know of? or should I create a schematic.

 

I forgot to mention when you sent the scanned 881 schematic that on your board they did not have that odd cap to the tank circuit on the 8225 clock.  And they had a jumper to eliminate the trim cap on the crystal input (which is funny since the user could just take the trim cap out and put jumper in its pads)

 

Thanks again, I will keep you updated

 

Best regards

 

Craig

 

On Feb 17, 2022, at 4:28 PM, Will Halphen <whalphen@gmail.com> wrote:



Interesting that you enjoy flying.  I’ve always had a desire to learn to fly, but never pursued the interest.  It must be a very enjoyable activity!

 

I’ve got several design projects underway at the moment.  Each project goes on hold once I determine the parts I need to order.  When I have order lists from several projects I’ll place the orders for the parts.  Similarly, I wait and order PCBs for several projects at a time.  So my projects can take a long time, but I’m regularly completing some.  Anyway, today I was working on a hexadecimal display module.  I have a tube full of seven segment LED displays that someone gave me at the local amateur radio swap meet.  The tough thing is getting HEX decoders for seven segment displays.  The only chip I know of is the MC14495 and it seems to no longer be available in North America – except from  a few scalpers.  So I’m proceeding with a design using an ATTINY processor feeding the display characters via shift registers with latches.  One of the nice things about it is the processor can be setup to handle a variety of interfaces – even the STD bus.  The vintage tech is nice and familiar.  But the modern stuff is pretty flexible.  This is an amazing time to enjoy electronic design!  Incredibly capable devices, cheap components, powerful tools, and easy made to order PCBs and 3D printed items.  (However, I do have a few projects on hold because of part shortages lately.)

 

Will

 

 

From: craig.andrews@tessol-inc.com [mailto:craig.andrews@tessol-inc.com]
Sent: Wednesday, February 16, 2022 3:19 PM
To: 'Will Halphen' <whalphen@gmail.com>
Subject: 3870 project

 

Hi Will,

 

Regarding the bus contention, I am more worried about outputting high on the port while held low from the driving IC.  A 1n270 forward biased towards the driving chip will take care of that….. the driving chip can pull the port low as needed, but if the port is pulling the line low it cannot sink from the driving chip.  The forward drop of the 1n270 is small enough to keep the logic low below the threshold.  if I use a resistor for protection I would have trouble hitting the 0.7V logic low threshold.  with the input pin properly set to logic 1 and the driving TTL held at zero the drop across your 3.3K would be 1.75V under best case and more likely 2.2V.  so when reading the 3870 it would always be a logic 1.

 

You spend your nice days with a fly rod, I spend nice days flying… so this is a gloomy day hobby for both of us. I live near Portland so 6 months of gloomy is our trademark.

 

I see, it is the mostek SIO documentation you need, so we are in the same boat.  I have cut sheets for the winsystems 7314 and user’s manual for the versalogic but I haven’t gotten around to seeing if they are all the same.

 

What we need is the 7301 of which I have the manual but no board.

 

Anchor has 8251As for a few of dollars I think.

 

As for your modern hybrid STD, there is a fellow in Alaska that is taking the SBC-85 design and blending it with a PIC or ardunio or some other such thing.  For me, the vintage brings back better memories than my time spent with modern things, so I prefer to stick with vintage.  I do STM32 things occasionally, but only on an “as needed” basis.

 

The patient is generally well mannered and good natured and after 40 years of living with me she is well deserving of a little TLC.  (At least that is what she is telling me :).

 

Best regards,

 

craig

 

From: Will Halphen <whalphen@gmail.com>
Sent: Wednesday, February 16, 2022 10:55 AM
To: 'craig Andrews' <craig.andrews@tessol-inc.com>
Subject: RE: PLS-881

 

Regarding input protection, it may be helpful to put series resistors to limit the current in the event that you output low to a high input.  The datasheet indicates that these pins can handle 1.6 mA, so that would be a 3.3K resistor.  If the resistors cause any problems, you can replace them with jumpers. 

 

Yes, do some SBC-85 work first.  I don’t see a need for any rush on any of this.  I live in Michigan, and the winter is long here.  So I get lots of time to work on this stuff at this time of year.  But once spring comes along (in a few months), I’ll be spending more time on the rivers with a fly rod.

 

I hope all goes well with your patient.  Good luck with your nursing duties.

 

As for the serial board, I would like to bring up one of my STD Z80 boards and want to use a serial port.  The only serial board I have is the Mostek MDX-SIO.  And that’s the only one of my Mostek boards missing the documentation.  The prolog 7314 is probably the same as the Versalogic 7314 which has documentation and a schematic available online.  But it’s a bit overkill for what I want.  I’m thinking that I will first design an STD prototype card with I/O decoders in place.  That would be a handy design to share with others.  Then I’ll clone the design, remove the prototype area, and put in a uart with one serial port.  I’ll include a uart to usb circuit on board so I can just plug it into a notebook computer as the terminal.  Now I have to find a uart chip that is readily available and not too costly.  I’m not familiar with what’s in production these days.  I have some old 8251 chips, and one company still makes them, but the cost is high.  Let me think on this a while.  If I decide I want a prebuilt one, I may take you up on your offer of the 7314. 

 

(It’s interesting how I keep coming up with modern solutions for these old challenges.  I keep thinking that I could do the whole serial IO design with just a single $3 PIC microcontroller.  Then I would have SPI and I2C, as well.  Could that be a thing?  An 8085 STD card with a bunch of PIC microcontrollers on STD cards as peripheral controllers. It would be pretty easy and could still run 8085 code and CPM.)

 

Will

 

From: craig Andrews [mailto:craig.andrews@tessol-inc.com]
Sent: Wednesday, February 16, 2022 12:41 PM
To: Will Halphen <whalphen@gmail.com>
Subject: Re: PLS-881

 

Hi Will,

 

Thanks for the update

 

Yes, I noticed the serial version, it looks like the -73 version has a full UART and baud rate generator inside.  I read an AP note just a day or so ago that was dedicated to nested calls and I don’t think that will become a limiting factor.  As I read it, your version of the chips has the executable RAM in addition to the scratchpad.. so that is nice.

 

if I am reading everything right, your chips have light pull ups on the outputs (6k as I remember).  I am wondering if I should protect devices driving the input pin from contention since I am sure to mess up and output those as low bits sooner or later.  I guess I could drive the input pins with open collector, at first blush that looks like it would solve the problem.  Or I could put in a signal diode, I need to see what fits better after I start assigning pins.

 

I will ruminate on the design a but… I may slip the STD SBC-85 board in first.

 

The Mrs is having footwork done so she will be in dry-dock for several weeks and I will be her manservant—so the next couple of weeks will be full of interruptions whenever she rings her little call bell.  Things should free up in a few weeks, unless one of us kills the other I suppose.

 

Did I see you were looking for a Mostek SIO? I am pretty sure that I have one, but never found documentation and I haven’t bothered reverse capturing.   If I have one and you want it, it’s yours.  Or I have a prolog 7314 UART if you prefer but, again, I don’t think it has a schematic and haven’t gotten around to capturing one.

 

Best Regards

 

Craig

 

On Feb 16, 2022, at 9:01 AM, Will Halphen <whalphen@gmail.com> wrote:



Craig,

 

I’m ok with you mentioning my name on your videos.  And OK with you mentioning that I obtained the chips from some college buddies who worked at Mostek.  These were commercially available chips.  I’ve been reading about the MK38P70.  It has some interesting features.  It has no stack, but it has a single level buffer of the program counter so a subroutine can be called.  However, if you want to nest subroutines, you have to create and maintain a stack.  This is made easier because of the scratchpad RAM which is accessible in a single processor cycle.  This F8 guide has a lot of helpful information and suggestions for using this processor. http://www.bitsavers.org/components/fairchild/f8/67095664_F8_Guide_To_Programming_1976.pdf

 

There was another version of this chip that included a serial port.  I checked my collection and I think I have one of those.  But it has no printed markings, only a hand written part number in pencil.  So it was likely a chip used for testing purposes at Mostek.

 

This LLL BASIC code seems to be setup for use with the CPM BIOS.  It has addresses defined for several drivers, such as console in and console out.  Of course, if you don’t want to use it with CPM, the ROM just needs to have drivers for the console and these addresses need to be changed to the addresses of the drivers in the ROM.  LLL BASIC should work with only the console in and console out drivers.  So redefine the driver addresses in the code, update the EQU statements to define the RAM location, assemble it and load it to EPROMs, and it should run.  After that you can modify the code, add your own keywords and functions, and have your own custom version of BASIC.

 

The tracking number for your package is 1Z1EE6650348537027 (UPS).  No need to reimburse me for the shipping.  I may call on you someday for some parts or assistance.  I’m just glad to have these parts go to someone who can do something with them – other than grind them up for gold – and potentially help others to learn about the evolution of microprocessors.

 

Will

 

 

From: craig.andrews@tessol-inc.com [mailto:craig.andrews@tessol-inc.com]
Sent: Tuesday, February 15, 2022 9:06 PM
To: 'Will Halphen' <whalphen@gmail.com>
Subject: RE: PLS-881

 

Thank you Will, again this is very much appreciated and let me know how I can pay back your generosity.  It seems at least I should pay for shipping or send you something I have that you would like in return.  Think STD or Multibus and I probably have something you could use.

 

I appreciate the scans of the schematics and documentation, I will go through them this evening.  I have been porting my confidence test over to the 881 and stopped to make some improvements, so I have not gotten to looking further at the LLL basic project.

 

As for the MK38P70 I think I am settling in to a system concept for a first go around and, as so often is the case, I wound with a clock.

 

Rather than the TIL311 hex displays, I am now thinking of using DL2416s.  Like the TIL, they offer aesthetics matching the time period, but they provide the full alphanumeric set so in addition to a clock it can also be set up as a scrolling text display.  I am thinking of 16 or 20 digits (4 or 5 displays).  4 displays will fit on the 100mm square $1 board but having 5 displays and up to a 5” wide $2 board will not break the bank.

The MC146818 real time clock came out in the early 80s, so I planning to include it on the board.

A few switches with left over input lines; and,

A serial port.  I would really like to use a MAX232 but it didn’t come along until well later so that leaves me with either 5V signal or using the immortal 1488/1489 set and supplying +/- 12V.   Sometimes I bend the rules for convenience so the MAX232 may win out this time since nothing else requires the bipolar 12V.

Just a barrel connector for power in if I stick with pure 5V.  the DL2416s will pull more than their share of current.

 

I will do an introduction video to gauge the level of interest for sharing the project, the MK38P70 is a unique enough platform to draw some interest.  Since the MK38P70 is a gift from you and you are the reason behind the project, with your permission I would like to give some background on where the chips came from.  Please let me know what I can share…. Or I can just say “my new buddy Will sent me an idea and some chips…”

 

Best regards

 

Craig

 

 

From: Will Halphen <whalphen@gmail.com>
Sent: Tuesday, February 15, 2022 2:07 PM
To: 'craig Andrews' <craig.andrews@tessol-inc.com>
Subject: PLS-881

 

Craig,

 

I’m sending you a package with the Prolog PLS-881 and a PLS-441.  I also included a few of the MK38P70 chips.  I opened the PLS-881 package and scanned the docs.  They are attached.  You can validate your reverse engineering schematic.  Also attached is the specification doc for the PLS-441.  This is the only technical documentation I’ve been able to find on it.

 

Regards.

 

Will

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