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Recent content by dave_m

  1. dave_m

    TTL Logic Analyzer Recommendations?

    This is a very important point with old logic analyzers. The prices can look very affordable, but without all the cables, pods and flying lead sets, they are useless.
  2. dave_m

    PLA - PLS100N vs PLS100F

    I did not know this. Thanks for the info. My version of WinCUPL only runs on very old Windows like W98 or 32 bit versions of XP and use RS 232. Is this OK for you?
  3. dave_m

    PLA - PLS100N vs PLS100F

    It's good to find a person who can still program the PLS100/82S100 part. This was the first Programmable Logic Device on the market back in the mid 1970's. I have a Data I/O 29B Programmer with the 303A-001 Signetics Programming Adapter. I also have the 303A-101 Signetics H & L Design Adapter...
  4. dave_m

    8032 chirping continuously, PETTEST can't execute the full RAM test

    Excellent troubleshooting.
  5. dave_m

    Another PET 2001 with no cursor...

    Hi Philip, Nice to hear from you. I'm impressed you have keep that old Pet working for so long. I remember when you, MikeS and I (plus others) fixed that PET so many many years ago. You took many great scope photos that really helped us find the usual problem (flaky NAND gate?). Looks like you...
  6. dave_m

    Another 8032 to fix!

    Good work daver2 and KevinO...
  7. dave_m

    CBM 8032 won't boot

    Daver, no, as Hugo says, it is a BRK (B*) to the Monitor. If /diag was held Low, it would perform a Call to the Monitor. The Program Counter is sometimes in low RAM and sometimes at $Dxxx.I would guess bad ROM or bad zero page RAM.
  8. dave_m

    New Release: PETSTRIP for PET/CBM 3032 and 4032

    It is amazing what can be done on a 45 year old first generation home computer by creative people.
  9. dave_m

    Converting CBM 8032 PET to switching power supplies

    Yes, the video board by the PET can pass the 21VDC through its full wave rectifier with minor voltage drop and drive the the voltage regulator chip which outputs the required +18VDC. See Video board schematic http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/8032/321448.gif
  10. dave_m

    Commodore PET 2001-8 Question

    That top ROM is stamped 6540-014 and is from a BASIC 1 set and the chip goes into socket H6. Here is the info on that part: H6 901439-06 6540-014 ROM Basic 1 D800-DFFF And note that there are no way to know that this 45 year old part is still working unless it was recently tested.
  11. dave_m

    PET 4032 - can't run d64 images from PETdisk MAX v2

    Yes, the pass thru IEEE port connector is a handy feature.
  12. dave_m

    PET 4032 - can't run d64 images from PETdisk MAX v2

    Whenever I have to do a firmware update on a gadget, I break a sweat thinking of all that can go wrong leaving me in the Twilight Zone.
  13. dave_m

    PET 4032 - can't run d64 images from PETdisk MAX v2

    Perhaps the MAXv2 firmware has been corrupted. Did you try to reload it? It used to be somewhat difficult task requiring an Atmel programmer, but he has added code to do this within his gadget. Of course you may be wary of doing this since the .prg files are working right now, and if the boot...
  14. dave_m

    3032 - 2001N Repair

    If the signal Graphic is stable, then the VIA source is OK. It may be the character generator ROM itself. Can you replace it with a programmed 2816 EEPROM? You want to use the 2K bin file characters-2.901447-10.bin from this page...
  15. dave_m

    Commodore Pet 2001, to buy or not to buy?

    It may also not have the original RAM and ROM chip sets. You would have to look inside to see if it has a RAM/ROM replacement board plugged into the CPU socket. It would be fully functional with a replacement RAM/ROM board and maybe even more reliable, but not worth the top money to a collector...
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