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  1. W

    Commodore PC40-40 repair, mainboard is a PC/900-2, PB85065-(I)-2F

    Great stuff! Thank you! Where did you find these details?
  2. W

    Very quick repair of post code 07 of a random mainboard with a Pentium CPU (maybe also 486, 386, ???)

    I'm by far not an expert. But it seems to check that the clock chip is there at post, since it stops without that chip. Empty battery is not an issue. It is just annoying, since it always forgets the settings for harddiscs and so on. Oh cool, that's the answer. Thank you very much! (y)
  3. W

    Commodore PC40-40 repair, mainboard is a PC/900-2, PB85065-(I)-2F

    As I had disassembled the machine, I used it to test some floppy drives - 3.5" and 5.25" (360k and 1.2M) - and they worked fine. But I only used the controller, which came with the machine. Also I did no extensive testing, just read, write and format. I have absolutely no experience with sound...
  4. W

    NCR 8707 (aka NCR MODEL 3279 PC8) needs some help

    Thank you for these helpful facts (y) It is not so easy to buy this device here in Austria. There are a few online shops, which I don't know. Well, so far my cheap ZD-552 works fine. I just need to be patient, until I find a good offer for the Hakko.
  5. W

    Very quick repair of post code 07 of a random mainboard with a Pentium CPU (maybe also 486, 386, ???)

    Hi, I had to post this. Although for the experienced guys here, this might not even be worth posting. Surprisingly I did not find much about this, so maybe it might help others to do a very easy fix on a retro mainboard. What was the problem? The other day I pulled out my trusty working...
  6. W

    NCR 8707 (aka NCR MODEL 3279 PC8) needs some help

    I think I want that Hakko-Thing too.......... :love: although it's quite expensive. But since my next birthday will be soon (in November), I should make myself a gift :p
  7. W

    NCR 8707 (aka NCR MODEL 3279 PC8) needs some help

    Hi Rodney, the Commodore Thread exists already: https://forum.vcfed.org/index.php?threads/commodore-pc40-40-repair-mainboard-is-a-pc-900-2-pb85065-i-2f.1247658/ For diagnosing XTs and ATs I learned, that you need an EGA/MDA/CGA graphics card. Therefor I keep one on hand, which works very well...
  8. W

    Commodore PC40-40 repair, mainboard is a PC/900-2, PB85065-(I)-2F

    I also think, that this board is not a development of Commodore. The graphics card, which is in my machine, is certainly also not the one, with which the machine came back in the day. It is an interesting little... ok - very big - machine.
  9. W

    Commodore PC40-40 repair, mainboard is a PC/900-2, PB85065-(I)-2F

    That confirms, what my many google searches revealed: There is almost nothing to find about this machine. Hopefully this thread will be used in future to collect information about it.
  10. W

    Commodore PC40-40 repair, mainboard is a PC/900-2, PB85065-(I)-2F

    I forgot to mention, that I replaced the original clock chip HD146818P on position U120 by a replacement from Necroware. It's a nwX287, which I bought from eBay. But you can't use that out of the box. As Necroware mentions on his Github page, you either need to put a pullup or pulldown on pin 1...
  11. W

    Commodore PC40-40 repair, mainboard is a PC/900-2, PB85065-(I)-2F

    Unfortunately I forgot to make photos. It is now already inside of the case and I do not want to remove it again, since I hate these tabs, which hold it in place. The photos which I just made are already in the case. But you should see, that this is a completely different board than the one of...
  12. W

    Commodore PC40-40 repair, mainboard is a PC/900-2, PB85065-(I)-2F

    Hi, this is not a request for help; I just want to document my repair of a Commodore PC40-40. It seems that the mainboard is quite rare and maybe this thread helps somebody else to repair his machine. I did not find much information about that machine and board. There are no videos on Youtube...
  13. W

    NCR 8707 (aka NCR MODEL 3279 PC8) needs some help

    Hi Rodney, what do you mean with 9 pin connector? Do you mean that CGA/EGA/MDA connector? If yes, I agree, that these are quite rare already. But I mostly use a RGBTOHDMI. If this does not work, then I use my Eizo. If the computer and graphics card works, then the Eizo shows something. I don't...
  14. W

    NCR 8707 (aka NCR MODEL 3279 PC8) needs some help

    WOW! I am just a beginner and I need lots of external knowledge (like this forum) to repair such computers. On this mainboard 3 tantalums were broken: One had exploded already and I just found the lower part. Two others (on +12V and -12V) looked fine, but were shorted. It's a pity... I liked...
  15. W

    NCR 8707 (aka NCR MODEL 3279 PC8) needs some help

    Hi Rodney, that's a pity, that your machine makes so much troubles. Mine seems to be "Made in Germany". The soldering is perfect (except of the parts, which I had to solder.... :cool:). The machine works now fine. Even the 5.25" disc drive works fine. The hard drive is one of the most...
  16. W

    NCR 8707 (aka NCR MODEL 3279 PC8) needs some help

    Hi again, modem7, you are my hero (y)(y)(y) With Supersoft/Landmark for AT I finally got a picture and a hint what was wrong: It told me "16K Critical Memory Region" failed. I then removed the entire RAM bank 0. My RAM tester told me, that 10 of the 12 ICs were faulty. 10 of 12!!! Luckly I...
  17. W

    NCR 8707 (aka NCR MODEL 3279 PC8) needs some help

    Hi! Thank you very much for your help! My post code card is exactly the one, which you've mentioned above. And now I finally understand, how this codes work :-) Of course you are right.... I resocketed and used some Deoxit on the sockets and the ISA slots, without any change. So far I could...
  18. W

    NCR 8707 (aka NCR MODEL 3279 PC8) needs some help

    Hi! I just purchased a giant computer, a NCR 3279-0202. It is a 286 with (I guess) 640kB of RAM and a big, fat ISA-card, which contains (I guess) serial, parallel and some graphics stuff. The mainboard is this one: https://theretroweb.com/motherboards/s/ncr-model-3279-0xxx-pc8-rev.-03-92 In this...
  19. W

    (Another ?) IBM 5150 with "Parity Check 1"

    Hi again, this is another repair thread, this time without needing some help and with a happy end :) I spent so much time with that bloody machine and I want to help others which maybe have the same issue. It is about an IBM 5150. It boots, but always shows a "Parity Check 1" - after...
  20. W

    IBM 5160 does not post with original ROMs, but no error with Landmark Diagnostic ROM

    Yes, indeed. These are really very difficult to fix. You never know: Does not now work by chance - or is the issue gone (but why!?)..... Sorry... the next computer of my friend is already waiting for me. This is an IBM 5150 with RAM issues (intermittent... of course). It always boots, but...
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