Return-Path: Delivered-To: craig@sbc-85.com Received: from gator4254.hostgator.com by gator4254.hostgator.com with LMTP id UISaMQ758mg5cwEAcizydQ (envelope-from ) for ; Fri, 17 Oct 2025 21:18:54 -0500 Return-path: Envelope-to: craig@sbc-85.com Delivery-date: Fri, 17 Oct 2025 21:18:54 -0500 Received: from p-impout005aa.msg.pkvw.co.charter.net ([47.43.26.136]:46457 helo=p-impout005.msg.pkvw.co.charter.net) by gator4254.hostgator.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.1) (envelope-from ) id 1v9wX0-00000000Rzp-1Qiq for craig@sbc-85.com; Fri, 17 Oct 2025 21:18:54 -0500 Received: from GeorgeAdams ([74.131.139.95]) by cmsmtp with ESMTPA id 9wWovww7i8OhM9wWovfhOA; Sat, 18 Oct 2025 02:18:43 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cinci.rr.com; s=c20240129; t=1760753923; bh=6v0rSYSkG2UNnrirW73JZmmz8ELTp8i29ZjMb3BWpXM=; h=From:To:References:In-Reply-To:Subject:Date; b=KTr6pxacW3qXf5tZAdOt5yW4HX5fmmwIQK87ZeYR5EQXypTIjUctoQqHw2iqC+sQb rrml7D7w5MwfHaYy+gxL63wx8TysXE4tstRWMhdtNGr4n/0RHaC1GAswfeMtP8RfE6 Uf4iOKB8xsaQs0aXnv3/iyklmcy1CYRD8YvWW/3Y4iHQKY8R8YH3FuXyu2gw6HmqP4 fyIS9m7ql2nKPtgfdqLzp2o52LWXkhEv4aGYdC6y0DaPrlfSqlRTLqnBMMu5A43WUg JyqtLL/1DPjzzgNJNYvt1/bf1IA9BKFCmQan6FYnEWSv8/ZRknY2yteKUpAiIVgs2u 8CpVM02eRVDrg== X-Authority-Analysis: v=2.4 cv=GbcRnxXL c=1 sm=1 tr=0 ts=68f2f903 a=hl8TJCE9z2sxp+2MqBjxnA==:117 a=hl8TJCE9z2sxp+2MqBjxnA==:17 a=DAwyPP_o2Byb1YXLmDAA:9 a=_6GpL_ENAAAA:8 a=HjitWDSJAAAA:8 a=ayC55rCoAAAA:8 a=5hvjFrRZXsg6NJHIqGoA:9 a=CjuIK1q_8ugA:10 a=yMhMjlubAAAA:8 a=SSmOFEACAAAA:8 a=yWcT236CswNAz1AqG94A:9 a=3WVn_kVa5Uky0l6e:21 a=gKO2Hq4RSVkA:10 a=UiCQ7L4-1S4A:10 a=hTZeC7Yk6K0A:10 a=frz4AuCg-hUA:10 a=lqcHg5cX4UMA:10 a=LwX-U-nOfP1m2u8RUeUA:9 a=KQqxNPgzF0kA:10 a=VEiTNn8F7TgA:10 a=IB1QFG2aBfq3amWdyr0s:22 From: To: References: <000301dc3fa6$dc596780$950c3680$@cinci.rr.com> <064e01dc3fc4$b442aa40$1cc7fec0$@sbc-85.com> In-Reply-To: <064e01dc3fc4$b442aa40$1cc7fec0$@sbc-85.com> Subject: RE: Nibbler Date: Fri, 17 Oct 2025 22:18:41 -0400 Message-ID: <000001dc3fd5$867746a0$9365d3e0$@cinci.rr.com> MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_0001_01DC3FB3.FF670630" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQNbD/3e5nqcrW5Tz5vol0/39lqqrQJ7NYt0sbWr/0A= Content-Language: en-us X-Antivirus: Avast (VPS 251017-4, 10/17/2025), Outbound message X-Antivirus-Status: Clean X-CMAE-Envelope: MS4xfNMmiwC5nymfVekkg/KLVWeOhkQ/Ig2q9aNhbihAOl6wBsAC71mX9XWKwHJvudu8XGmanWo51FD2fDneuTg46YxB+SbsA611bEV7lfS/adLjWmlHPyXN gfbXGWc0OODz7r+t726wJbGFyf4hMIRFDwRELhQ1s/absW5f98xJXN4gQtn7OWtyjoIcPd8bFcr9lA== X-Spam-Status: No, score=-4.3 X-Spam-Score: -42 X-Spam-Bar: ---- X-Spam-Flag: NO This is a multipart message in MIME format. ------=_NextPart_000_0001_01DC3FB3.FF670630 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0002_01DC3FB3.FF675450" ------=_NextPart_001_0002_01DC3FB3.FF675450 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Craig, I have the backplane assembled with 2 connectors, the rom board assembled and will be moving the kitbug++ code to the rom board tomorrow. Good call to move the code to a 2732. I see your point about p3. Might be nice to display to show where the xppc instruction will return to if for no other reason, but not necessary. Regards, George From: craig@sbc-85.com Sent: Friday, October 17, 2025 8:18 PM To: adamsgl@cinci.rr.com Subject: RE: Nibbler I fixed the P3 display/modify, that was simple enough but I am starting to think I left it off for a reason. It had been missing a long time because I didn't even make a storage register for P3. The reason being.... When entering debug, P3 is the user's program counter since they just did an XPPC P3, and it is saved as such. Right before the user's xppc instruction, p3 was set to warmstart so presumably that should be the starting point for p3 when entering debug. While in debug, p3 can be modified, but it will be forced to be the users pc so the debug GO command can do another XPPC. I need to give this some more thought Do you have your expansion rom board going? I have my system set up with the base rom on the nibbler to just jump up to 2000h which is where my rom board is located. Then I only have to program one 2732 for the whole kitbug++ code rather than messing with two 2716s every time. Regards craig From: craig@sbc-85.com > Sent: Friday, October 17, 2025 4:49 PM To: 'adamsgl@cinci.rr.com' > Subject: RE: Nibbler Hi George, I don't know what happened to P3, I will put it back in. I did that portion of code over and over again a number of times until I was satisfied with the interface. One of those times it looks like P3 went missing. For the utility ROM, I will bring over some form of the ram testing and mapping. That is future work, I am now working through how I will attack the disassembler project. I thought about making the ROM board JEDEC sites but I didn't want to mess with more complicated address decoding. Not to get your hopes up too much. because I do not have a schedule for it and am not promising anything.. But I am working on a schematic for a nibbler board that has a 6264 RAM. Regards craig From: adamsgl@cinci.rr.com > Sent: Friday, October 17, 2025 1:45 PM To: craig@sbc-85.com Subject: Nibbler Craig, I have been working thru the commands an wanted to ask when the registers are displayed, only p0, p1 and p2 are displayed. What about p3? I am sure I missed something but is there a reason for this? I have not seen anything in the documentation that needs review (great job). Learning a lot from reviewing your code for kitbug++. Thanks again for the well documented code. You asked for me to make a list of what to add to your additional rom code. Maybe we could have the ram check? Bought mm5257 rams on ebay and they are getting scarce and costly. (but I will continue to purchase as long as I can find them) Is there any thought to making a ram board with 8k x 8 bit wide chips? (not vintage, which I'm not a fan of) Maybe I just need to put these in the rom board and tweak the connections a bit. Your thoughts? Regards, George Virus-free. www.avast.com -- This email has been checked for viruses by Avast antivirus software. www.avast.com ------=_NextPart_001_0002_01DC3FB3.FF675450 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Craig,

 

I have the backplane = assembled with 2 connectors, the rom board assembled and will be moving = the kitbug++ code to the rom board tomorrow.  Good call to move the = code to a 2732.

 

I see your point = about p3. Might be nice to display to show where the xppc instruction = will return to if for no other reason, but not = necessary.

 

Regards,

 

George

 

From: craig@sbc-85.com <craig@sbc-85.com>
Sent: = Friday, October 17, 2025 8:18 PM
To: = adamsgl@cinci.rr.com
Subject: RE: = Nibbler

 

I fixed the P3 display/modify, that was = simple enough but I am starting to think I left it off for a = reason.  It had been missing a long time because I didn’t = even make a storage register for P3.  The reason = being…...

 

When entering debug, = P3 is the user’s program counter since they just did an XPPC P3, = and it is saved as such.  Right before the user’s xppc = instruction, p3 was set to warmstart so presumably that should be the = starting point for p3 when entering debug.  While in debug, p3 can = be modified, but it will be forced to be the users pc so the debug GO = command can do another XPPC.

 

I need to give this = some more thought

 

Do you have your = expansion rom board going?

I have my system set = up with the base rom on the nibbler to just jump up to 2000h which is = where my rom board is located.  Then I only have to program one = 2732 for the whole kitbug++ code rather than messing with two 2716s = every time.

 

Regards

craig

 

From: craig@sbc-85.com <craig@sbc-85.com> =
Sent: Friday, October 17, 2025 4:49 PM
To: = 'adamsgl@cinci.rr.com' <adamsgl@cinci.rr.com>
S= ubject: RE: Nibbler

 

Hi George,

 

I don’t know = what happened to P3, I will put it back in.  I did that portion of = code over and over again a number of times until I was satisfied with = the interface.  One of those times it looks like P3 went = missing.

 

For the utility ROM, = I will bring over some form of the ram testing and mapping.  That = is future work, I am now working through how I will attack the = disassembler project.

 

I thought about = making the ROM board JEDEC sites but I didn’t want to mess with = more complicated address decoding.

 

Not to get your hopes = up too much…  because I do not have a schedule for it and am = not promising anything…. But I am working on a schematic for a = nibbler board that has a 6264 RAM.   

 

Regards

 

craig

 

From: adamsgl@cinci.rr.com = <adamsgl@cinci.rr.com> =
Sent: Friday, October 17, 2025 1:45 PM
To: craig@sbc-85.com
Subject: = Nibbler

 

Craig,

 

I have been working = thru the commands an wanted to ask when the registers are displayed, = only p0, p1 and p2 are displayed. What about p3? I am sure I missed = something but is there a reason for this?

 

I have not seen = anything in the documentation that needs review (great job). Learning a = lot from reviewing your code for kitbug++. Thanks again for the well = documented code.

 

You asked for me to = make a list of what to add to your additional rom code. Maybe we could = have the ram check?

 

Bought mm5257 rams on = ebay and they are getting scarce and costly. (but I will continue to = purchase as long as I can find them) Is there any thought to making a = ram board with 8k x 8 bit wide chips? (not vintage, which I’m not = a fan of) Maybe I just need to put these in the rom board and tweak the = connections a bit. Your thoughts?

 

Regards,

 

George

 

 

3D"Image

Virus-free.www.avast.com

 

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