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  • daver2's Avatar
    Yesterday, 01:33 PM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    Monty, Ignore my last request! I just copied your data for MickeyMouse.bas and get a similar issue - on the Board Bucket we seem to be missing...
    159 replies | 6674 view(s)
  • daver2's Avatar
    Yesterday, 01:14 PM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    Monty, I have got my tektronix graphics emulation running on my emulation of the board bucket. Still getting strange results as far as snoopy...
    159 replies | 6674 view(s)
  • daver2's Avatar
    Yesterday, 11:52 AM
    Yes: The keyboard should be mechanically and electrically the same - just the new keys (but DEC will have wanted to charge you more for the kit of...
    3 replies | 104 view(s)
  • daver2's Avatar
    Yesterday, 11:30 AM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    This is the Javascript code for the COMSPACK ROMS. I concatenated all of the individual ROMS together to make a single 8K ROM image for the emulator....
    174 replies | 15393 view(s)
  • daver2's Avatar
    Yesterday, 06:09 AM
    daver2 replied to a thread Tektronix 'Board Bucket' 6800 in Other
    Good find Monty :-) (and thanks to Clay for hosting them). I have been looking for these myself since I developed the emulator! I will convert...
    108 replies | 8987 view(s)
  • daver2's Avatar
    Yesterday, 06:04 AM
    The quick answer - I will expand a bit later - is twofold: 1) Some of the signals are not true digital signals and have degraded such that the...
    66 replies | 1370 view(s)
  • daver2's Avatar
    Yesterday, 05:58 AM
    >>> I'm wondering if anyone has a terminal with the APL upgrade. Is it just a ROM set, or a whole plug in board? I had exactly the same question...
    3 replies | 104 view(s)
  • daver2's Avatar
    January 20th, 2019, 02:48 PM
    I am going back to thinking the terminator is a CONTROL-Z... 232 (OCTAL) = 154 (decimal). Subtract 128 = 26 (decimal) = 0x1A = CONTROL-Z. The...
    27 replies | 658 view(s)
  • daver2's Avatar
    January 20th, 2019, 11:44 AM
    I have just had another look at ASR33.PA and I must have 'been on something' when I suggested CONTROL-Z as a terminator! Yes, coding is two WORDS...
    27 replies | 658 view(s)
  • daver2's Avatar
    January 20th, 2019, 11:34 AM
    daver2 replied to a thread Tektronix 'Board Bucket' 6800 in Other
    OK - I have gone back to the Board Bucket and DDT/BASIC for a while... Managed to get a 'file loader' running for BASIC. If you try and act as...
    108 replies | 8987 view(s)
  • daver2's Avatar
    January 20th, 2019, 11:28 AM
    daver2 replied to a thread Midwest 6800 in Other
    >>> How hard is it to disassemble this stuff? It's not that difficult. The MC6800 instruction set is quite well behaved and simple - so you can...
    86 replies | 4661 view(s)
  • daver2's Avatar
    January 20th, 2019, 09:46 AM
    daver2 replied to a thread Midwest 6800 in Other
    >>> Do you see the code for it in there or just a key that calls it? It's difficult to say. The message is in the second EPROM on the CPU card....
    86 replies | 4661 view(s)
  • daver2's Avatar
    January 20th, 2019, 08:59 AM
    daver2 replied to a thread Midwest 6800 in Other
    So - the plot thickens... I have implemented an NMI button on my emulator (so I can press the NMI button like you can Falter...). This is a...
    86 replies | 4661 view(s)
  • daver2's Avatar
    January 20th, 2019, 05:53 AM
    daver2 replied to a thread Midwest 6800 in Other
    OK, With the 'new' ROMS in my emulation, when I hit the 'ANY KEY' (!) I get a 'Command Failed' response from the ROM in socket #3. This is better...
    86 replies | 4661 view(s)
  • daver2's Avatar
    January 20th, 2019, 05:32 AM
    daver2 replied to a thread Midwest 6800 in Other
    I have 'massaged' the ROM contents... Socket 1 ROM looks like the DISK BOOT. I think it resides starting at C000. Socket 2 ROM looks to be a...
    86 replies | 4661 view(s)
  • daver2's Avatar
    January 19th, 2019, 02:33 PM
    daver2 replied to a thread Midwest 6800 in Other
    Well they helped to shed some light on the RESET, NMI, IRQ and SWI vectors :-)! Dave
    86 replies | 4661 view(s)
  • daver2's Avatar
    January 18th, 2019, 01:03 PM
    Hey Mike, When you say "it did not print what you expected" what do you mean? Did it print anything at all or nothing? Just looking at the OS/8...
    27 replies | 658 view(s)
  • daver2's Avatar
    January 17th, 2019, 01:36 PM
    daver2 replied to a thread D.R.E.A.M. 6800 Build in Other
    That appears to be a different board again! The one I had seen still had the wire jumpers (true to original) and he hadn't actually built his yet...
    25 replies | 1008 view(s)
  • daver2's Avatar
    January 16th, 2019, 01:53 PM
    There are legal ways round this of course - but you need to be a commercial company with money to employ a decent law firm... We have had recourse to...
    31 replies | 1053 view(s)
  • daver2's Avatar
    January 16th, 2019, 01:44 PM
    daver2 replied to a thread D.R.E.A.M. 6800 Build in Other
    I have the assembler file typed up for CHIPOS. It assembles without errors (now I have fixed a few typos that I entered of course) and it now...
    25 replies | 1008 view(s)
  • daver2's Avatar
    January 16th, 2019, 01:37 PM
    daver2 replied to a thread Tektronix 'Board Bucket' 6800 in Other
    Hi Jos, Me like :-)!!! BitBucket or BoardBucket though? Dave
    108 replies | 8987 view(s)
  • daver2's Avatar
    January 15th, 2019, 01:02 PM
    daver2 replied to a thread D.R.E.A.M. 6800 Build in Other
    I have the assembler listing file for it - that is what I am currently typing in. I have tried OCRing it - but no dice (even a nice PDF copy I...
    25 replies | 1008 view(s)
  • daver2's Avatar
    January 15th, 2019, 11:58 AM
    daver2 replied to a thread D.R.E.A.M. 6800 Build in Other
    But do you have the source code for it that you can assemble rather than just the BIN/HEX/SREC? Dave
    25 replies | 1008 view(s)
  • daver2's Avatar
    January 15th, 2019, 11:49 AM
    daver2 replied to a thread D.R.E.A.M. 6800 Build in Other
    Forgot to say - I am typing in the source code for the CHIP8 interpreter from the source code listing. It was too complex for OCR - but I may have...
    25 replies | 1008 view(s)
  • daver2's Avatar
    January 15th, 2019, 11:36 AM
    Give me a couple of days (another business trip coming up) and I will post my thoughts on what I think the issue could be. When you are ready to...
    66 replies | 1370 view(s)
  • daver2's Avatar
    January 15th, 2019, 11:32 AM
    daver2 replied to a thread D.R.E.A.M. 6800 Build in Other
    >>> in that it’s that small AND single sided. Incredible use of jumpers, making it possible for hobbyists to etch the board at home easily. Very...
    25 replies | 1008 view(s)
  • daver2's Avatar
    January 15th, 2019, 11:25 AM
    Open it up and get the vacuum cleaner on it - the suction hose that is; not the brushes :-)! Dave
    33 replies | 518 view(s)
  • daver2's Avatar
    January 15th, 2019, 11:18 AM
    daver2 replied to a thread D.R.E.A.M. 6800 Build in Other
    I notice over on the microbee site that someone is recreating the 6800/6802 DREAM CPU, KEYPAD and PSU PCBs. I will try and send them an e-mail to...
    25 replies | 1008 view(s)
  • daver2's Avatar
    January 15th, 2019, 11:14 AM
    Sorry I haven't got around to relying to your PMs - a few personal/work related items to take care of at the moment. I live in the UK - so...
    26 replies | 1284 view(s)
  • daver2's Avatar
    January 13th, 2019, 11:12 PM
    The Z80 CPU reset pin is a power on reset. The switch marked RESET actually drives the Z80 NMI pin. If the BOOT ROM is not working properly, it...
    27 replies | 1066 view(s)
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About daver2

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About daver2
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UK - Worcester
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SW/HW design engineer

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