Envelope-to: craig@sbc-85.com
Delivery-date: Mon, 08 Aug 2022 21:04:38 -0500
Message-ID: <d6f30cef-26b0-d798-5cfe-4dcda8089a7e@opsol.com.au>
Date: Tue, 9 Aug 2022 12:04:20 +1000
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Subject: Re: [SBC-85] Comment: "STD Bus 8085 SBC V1.0.2"
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To: SBC-85 <craig@sbc-85.com>
References: <b091b859-6770-2d71-a3ad-d2bdcad0ecf6@opsol.com.au>
 <AE13C3C2-91EA-4238-AD8B-C6412BFE9A32@sbc-85.com>
From: Denis Dowling <dpd@opsol.com.au>
In-Reply-To: <AE13C3C2-91EA-4238-AD8B-C6412BFE9A32@sbc-85.com>
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Hi Craig,

Thanks. When you work out postage let me know and I will paypal you the 
amount.

The back plane board looks great. I really like the silk screen labels 
on the pin headers and a great idea to have the edge connector on the 
edge of the design to make it easier to probe a board when it is lying flat.

Regards,
Denis

On 9/8/22 10:00 am, SBC-85 wrote:
> Hi Denis, these are all gratis for finding the bug. One pro-log, a 
> STD-85 bare and STD Backplane 8 bare.   See current backplane design here:
>
> https://bitsofthegoldenage.org/std-bus-backplane-anyone/
>
> Regards
>
> Craig
>
>> On Aug 8, 2022, at 4:31 PM, Denis Dowling <dpd@opsol.com.au> wrote:
>>
>> ﻿Hi Craig,
>>
>> This sounds like the best option. I am happy to wait and buy a 
>> backplane board as well. The logic analyser header is a good idea. It 
>> is always nice to be able to secure a scope probe to a 0.1" header 
>> instead of having to hold it onto a board.
>>
>> I think the AT power supply connector is a good idea as most of us 
>> have old AT power supplies lying around and if you use one the the 
>> compact ones from a 1RU server they are small and deliver plenty of 
>> power for projects like this.
>>
>> I am also a big fan of having some power leds on the board. Means you 
>> can see something is powered on before plugging or unplugging a card.
>>
>> For reference my address is:
>>
>> Denis Dowling
>> 4/221 McKean St
>> Fitzroy North
>> Victoria 3068
>> AUSTRALIA
>>
>> Regards,
>> Denis
>>
>>
>> On 5/8/22 4:47 am, craig@sbc-85.com wrote:
>>> one more thought....
>>> I am going to start laying out a STD backplane... probably around 6 
>>> slot.  it will have board mounted guides to support the cards. 
>>>   probably a header to connect a logic analyzer to check bus 
>>> signals, probably a barrel connector for just +5V or a AT power 
>>> supply connector if the +/- 12 and -5 is needed.
>>>
>>> I think I will be submitting a board order sometime this month so it 
>>> will be at least 6 weeks out.  if you do not have a std backplane, 
>>> you can wait until then if you want.
>>>
>>> cheers
>>>
>>> craig
>>>
>>> -----Original Message-----
>>> From: craig@sbc-85.com <craig@sbc-85.com>
>>> Sent: Thursday, August 4, 2022 11:15 AM
>>> To: 'Denis Dowling' <dpd@opsol.com.au>
>>> Subject: RE: [SBC-85] Comment: "STD Bus 8085 SBC V1.0.2"
>>>
>>> Hi Denis,
>>>
>>> HP was all about plug-ins.  it allowed many different configurations 
>>> and commonality between models but, of course, there was the 
>>> downside of problems with contacts.  same with many of the bus cards 
>>> like multibus.  removing the card, taking a pencil eraser to the 
>>> fingers, and reinserting was a routine process.  Good luck on the 
>>> deep dive and thank HP they published detailed service manuals.
>>>
>>> Since I owe you a vintage card, would you like the prolog 8085 or 
>>> maybe a prolog 77xx memory card or 7304 UART card?  I think I have 
>>> multiples of each and will never need all that I have.  it will not 
>>> change shipping too much I think.
>>>
>>> if you can send me your mailing address I can get exact amounts.
>>>
>>> regards
>>>
>>> craig
>>>
>>> -----Original Message-----
>>> From: Denis Dowling <dpd@opsol.com.au>
>>> Sent: Tuesday, August 2, 2022 4:29 PM
>>> To: craig@sbc-85.com
>>> Subject: Re: [SBC-85] Comment: "STD Bus 8085 SBC V1.0.2"
>>>
>>> Hi Craig,
>>>
>>> Sorry about not getting back to you. Things have been a little busy 
>>> here with work and a bit of a deep dive repair of a HP 8662A signal 
>>> generator I got for cheap. The interesting thing about the older HP 
>>> gear is that they are constructed with all with separate cards in 
>>> edge connectors.
>>> The service manual goes through running the system with just the CPU 
>>> card installed then adding memory and then various IO cards to 
>>> diagnose what cards introduce faults. Really clever design using a 
>>> small ROM on the CPU card that you can jumper in to turn on some 
>>> basic diagnostics.
>>>
>>> Anyway, I saw your latest video of the STD-85 board and it looks great.
>>> It is such a huge effort to go from the initial idea to a fully 
>>> working card. I would be keen to get my hands on one of the STD-85 
>>> cards so if you let me know what the cost and postage is to 
>>> Melbourne I will Paypal you the amount.
>>>
>>> Regards,
>>> Denis
>>>
>>>
>>> On 2/8/22 11:31 am, craig@sbc-85.com wrote:
>>>> Hi Denis,
>>>>
>>>> I have been testing the STD-85 board, updating documentation, etc., 
>>>> thanks again for finding that mistake or I would have had another 
>>>> round of boards about now.
>>>>
>>>> I still have your Pro-Log 8085 card here but it you would rather, I 
>>>> can send you the bare STD-85 board and a Pro-Log memory card like 
>>>> the 7702A?
>>>>
>>>> the last few cards I sent to Australia (Melbourne) was just shy of 
>>>> $20.  And another set to Australia (I forget where exactly but east 
>>>> coast) was about the same and each took the order of 10 days to get 
>>>> there.
>>>>
>>>> let me know if this sounds like something you would like to do.
>>>>
>>>> regards
>>>>
>>>> craig
>>>>
>>>> -----Original Message-----
>>>> From: Denis Dowling <dpd@opsol.com.au>
>>>> Sent: Tuesday, March 8, 2022 2:28 AM
>>>> To: craig.andrews@tessol-inc.com
>>>> Subject: Re: [SBC-85] Comment: "STD Bus 8085 SBC V1.0.2"
>>>>
>>>> Hi Craig,
>>>>
>>>> Understand about the shipping. I have had not had a good run 
>>>> recently with USPS shipping from the US. Some sort of strange 
>>>> shutdown in December held up all my shipments for 3 months. I will 
>>>> do a bit of research on the best option. Anyway I am happy to just 
>>>> keep following alone with this project.
>>>>
>>>> Regards,
>>>> Denis
>>>>
>>>>
>>>> On 8/3/22 11:38 am, craig.andrews@tessol-inc.com wrote:
>>>>> Hi Denis, I hope you don't mind that I am sending you an email 
>>>>> rather than back and forth in the comments.  Since you aren't 
>>>>> expecting this email address, please confirm receipt so I can make 
>>>>> sure it isn't stuck in your spam folder.
>>>>>
>>>>> The development hardware (and software tools) available now are 
>>>>> remarkable.  It amazes me any time I fire up my logic analyzer or 
>>>>> digital scope just how far we have come.
>>>>>
>>>>> I have a nice Pro Log 8085 board here for you with your name on 
>>>>> it.  I thought it was a 7801 but now that I look at it I think it 
>>>>> is a 7805.
>>>>>
>>>>> I didn't mean to be deceptive, but I am giving the board away, not 
>>>>> the shipping.   Shipping would run about $30 or you can send me a 
>>>>> prepaid label that I can print out and stick to the envelope.  I 
>>>>> can split the shipping with you since you saved me a wasted round 
>>>>> of circuit board revisions.
>>>>> I can get you dimensions and weights if you still want the board.
>>>>> Let me know what you would like to do.
>>>>>
>>>>> Again, thanks for your valuable feedback on the design of the STD 
>>>>> bus CPU board.
>>>>>
>>>>> Regards
>>>>>
>>>>> Craig
>>>>>
>>>>> -----Original Message-----
>>>>> From: Denis Dowling <wordpress@sbc-85.com>
>>>>> Sent: Monday, March 07, 2022 12:54 AM
>>>>> To: craig.andrews@tessol-inc.com
>>>>> Subject: [SBC-85] Comment: "STD Bus 8085 SBC V1.0.2"
>>>>>
>>>>> New comment on your post "STD Bus 8085 SBC V1.0.2"
>>>>> Author: Denis Dowling (IP address: 118.210.202.27,
>>>>> 118-210-202-27.tpgi.com.au)
>>>>> Email: dpd@opsol.com.au
>>>>> URL:
>>>>> Comment:
>>>>> I noticed that some parts in KiCAD are huge. It makes for a much 
>>>>> cleaner schematic when you redo these symbols.
>>>>>
>>>>> When I was a University I remember using a Z80 STD bus board for 
>>>>> some lab experiments. We had some wire wrap STD expansion boards 
>>>>> to wire up some IO expansion stuff. It was a great introduction to 
>>>>> embedded systems. We were using a C cross compiler hosted on a 
>>>>> unix minicomputer and you push the compiled binary code to the 
>>>>> boards with xmodem I think. I have recently been doing work on a 
>>>>> Jetson Xavier so everything is hosted on the couple of hundred 
>>>>> dollar development board.
>>>>> If you have a spare CPU card that would be neat but if the postage 
>>>>> to Australia is going to be a killer then don't worry about it. I 
>>>>> will keep an eye on your design an maybe pickup a board when you 
>>>>> have completed it.
>>>>>
>>>>> You can see all comments on this post here:
>>>>> https://sbc-85.com/download/std-bus-8085-sbc/#comments
>>>>>
>>>>> Permalink: https://sbc-85.com/download/std-bus-8085-sbc/#comment-35
>>>>> Trash it:
>>>>> https://sbc-85.com/wp-admin/comment.php?action=trash&c=35#wpbody-cont
>>>>> e
>>>>> nt Spam it:
>>>>> https://sbc-85.com/wp-admin/comment.php?action=spam&c=35#wpbody-conte
>>>>> n
>>>>> t
>>>>>
>>>>>
>>>
>>