Return-Path: Delivered-To: craig@sbc-85.com Received: from gator4254.hostgator.com by gator4254.hostgator.com with LMTP id yCKQIGsL9Gi8ogkAcizydQ (envelope-from ) for ; Sat, 18 Oct 2025 16:49:31 -0500 Return-path: Envelope-to: craig@sbc-85.com Delivery-date: Sat, 18 Oct 2025 16:49:31 -0500 Received: from p-impout003aa.msg.pkvw.co.charter.net ([47.43.26.134]:32782 helo=p-impout003.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 1vAEnq-00000002jgU-3tA3 for craig@sbc-85.com; Sat, 18 Oct 2025 16:49:31 -0500 Received: from GeorgeAdams ([74.131.139.95]) by cmsmtp with ESMTPA id AEnfv7wbMx0fvAEnfvTL60; Sat, 18 Oct 2025 21:49:19 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cinci.rr.com; s=c20240129; t=1760824160; bh=nVC6fN7UgTATX/tzH3E9K6AY35b8UOQ9sib9sMr6M2g=; h=From:To:References:In-Reply-To:Subject:Date; b=fbclFX9cGlnojeJmlaB6q8QiLPvSGV8ZLLurkS0Md/oRFV9TazXLurnoGjXoKEcXN Q2vh6qlApy+csuW1Ihk+NKdBivrrV8tP96qC23dUpdWJ5pZSHX90RUPuPiERLEERHR WYfDk1GKzsum4MkYUjoOJ6gGIh7Ruv74cdblTCtzFYpxt7CyigZKF6tZX3HruXVEVo WvK9wmHsiJZDb7V9Izit+K2ZsccHmAoG/yGudPajurAaoOkxn2Ujn8MDyELBkVhCRf rpFWPAT3rf/7YIns0yoyfKycSpDftQAK0pOCjUI3VxvkBFVqHrkUTrNfetZqArNAq6 OBNH9SQ3yOz+g== X-Authority-Analysis: v=2.4 cv=cZfUrGDM c=1 sm=1 tr=0 ts=68f40b5f a=hl8TJCE9z2sxp+2MqBjxnA==:117 a=hl8TJCE9z2sxp+2MqBjxnA==:17 a=DAwyPP_o2Byb1YXLmDAA:9 a=_6GpL_ENAAAA:8 a=ayC55rCoAAAA:8 a=HjitWDSJAAAA:8 a=WOoU94oP-ZBuYycGYpsA:9 a=CjuIK1q_8ugA:10 a=yMhMjlubAAAA:8 a=SSmOFEACAAAA:8 a=w9_pTzzftgTFTntVOMkA:9 a=q68Utj5nTBEpZb2A: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: Subject: FW: Nibbler Date: Sat, 18 Oct 2025 17:49:19 -0400 Message-ID: <000001dc4079$0f0ef050$2d2cd0f0$@cinci.rr.com> MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_0001_01DC4057.87FFC150" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQNbD/3e5nqcrW5Tz5vol0/39lqqrQJ7NYt0sbbi7tCAABTKcA== Content-Language: en-us X-Antivirus: Avast (VPS 251018-4, 10/18/2025), Outbound message X-Antivirus-Status: Clean X-CMAE-Envelope: MS4xfM+ghl8CP40R0KW8YfWFjgBw8aX/etUCEu7FoZGcZaa1BnTd8efM2oZuGCYJ9s0/VJgOI8bF2JLh8731p8joqGpqt1++EcAhmkCG8oXg5xEk4iwx4wXL 9NxxnLM0eFRYD/49JDxYPwRwOJZ2lWwGjumpdw20p/CsqcYafhKcjQvgMCDeUs6uOYWeVFxxNR9hJA== 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_01DC4057.87FFC150 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0002_01DC4057.87FFE860" ------=_NextPart_001_0002_01DC4057.87FFE860 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Craig, The easy answer is the jump is wrong. The relocated code runs if I use the g2000 command. And the relocated code displays correctly using the d2000 command. Not sure why the jump is failing, but progressing to the answer little by little. Regards, George From: adamsgl@cinci.rr.com Sent: Saturday, October 18, 2025 4:45 PM To: 'craig@sbc-85.com' Subject: RE: Nibbler Craig, I moved the kitbug eprom to the rom board and put a jmp to 2000H in the base eprom. Here is the jmp code: 2000- 44 LOW_ROM .EQ 2000H ;ROM 2000-2FFF 0000- 45 0000- 46 .OR $0 The SC/MP can't start at $0000 ! Source file: jmp.asm *** Warning: Instruction starts at page boundary 47 NOP 0000-08 47 ( 5) NOP 0001-C4 20 48 ( 10) ldi /LOW_ROM 0003-37 49 ( 8) xpah P3 0004-C4 00 50 ( 10) ldi #LOW_ROM 0006-33 51 ( 8) xpal p3 0007-3F 52 ( 7) xppc P3 Kitbug++ reassembled with ASM_CONFIG .EQ 1 Eproms programmed and verified (several times) The rom board is addressed and 2000H (a15, a14, a12 jumpers in place. Deselect jumper in place on rom board , removed on nibbler, eprom in u6 socket on rom board. Jp1 is 1-2, 3-4 for 8K There is no activity on the a13 line (on the nibbler) and no activity on the select output from the 78ls85. My question is does the jump code above look correct? I'm guessing not since a13 has no activity. (checked with logic analyzer) Thanks for the help. 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_01DC4057.87FFE860 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Craig,

 

The easy answer is = the jump is wrong. The relocated code runs if I use the g2000 command. = And the relocated code displays correctly using the d2000 = command.

 

Not sure why the jump = is failing, but progressing to the answer little by = little.

 

Regards,

 

George

 

 

From: adamsgl@cinci.rr.com <adamsgl@cinci.rr.com> =
Sent: Saturday, October 18, 2025 4:45 PM
To: = 'craig@sbc-85.com' <craig@sbc-85.com>
Subject: RE: = Nibbler

 

Craig,

 

I moved the = kitbug  eprom to the rom board and put a jmp to 2000H in the base = eprom.

Here is the jmp code:

2000-       = ;          = 44        = LOW_ROM         = .EQ     = 2000H           ;ROM = 2000-2FFF

0000-       = ;          = 45

0000-       = ;          = 46            = ;    .OR     = $0           The SC/MP = can't start at $0000 !

Source file: jmp.asm

 

*** Warning: = Instruction starts at page boundary

     = 47         = NOP

 

0000-08      &nb= sp;        47 (   = 5)         = NOP

0001-C4 = 20        48 (  = 10)         = ldi           &nbs= p; /LOW_ROM

0003-37      &nb= sp;        49 (   = 8)         = xpah    P3

0004-C4 = 00        50 (  = 10)         = ldi           &nbs= p; #LOW_ROM

0006-33      &nb= sp;        51 (   = 8)         = xpal    p3

0007-3F      &nb= sp;        52 (   = 7)         = xppc    P3

 

Kitbug++ reassembled = with ASM_CONFIG      = .EQ     1

Eproms programmed and = verified (several times)

The rom board is addressed and 2000H (a15, = a14, a12 jumpers in place.

Deselect jumper in = place on rom board , removed on nibbler,

eprom in u6 socket on = rom board.

Jp1 is 1-2, 3-4 for = 8K

 

There is no activity = on the a13 line (on the nibbler) and no activity on the select output = from the 78ls85.

 

My question is does = the jump code above look correct?  I’m guessing not since a13 = has no activity. (checked with logic analyzer)

 

Thanks for the = help.

 

Regards,

 

George

 

 

 

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

 

 

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