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Thread: IBM PGC appears "dead"

  1. #31
    Join Date
    Jun 2006
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    Very cool ! So how are you converting the PGA output to run on a VGA monitor ?

  2. #32
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    Sep 2017
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    Principality of Xeon
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    The way I've always done this is to add hsync and vsync to the green input with a resistor or trimpot. If you use a trimpot, start high and dial it down until you get a picture. I've never had to do that, but can't remember what value of resistors I used. Back then I was able to consult an ancient tome explaining how to adapt fixed frequency monitors for use with a pc. Macs were dead simple, you just needed a dongle.

  3. #33

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    Quote Originally Posted by mikey99 View Post
    Very cool ! So how are you converting the PGA output to run on a VGA monitor ?
    Its very simple, you just need to convert 9pin cable to 15pin. So you can make your own cable or just use couple of reductions like me

    IMG_6293.jpg
    IBM PC 5150(A): IBM PC 5150(B): IBM PC 5160 (64-256k): IBM PC 5160 (256-640k): IBM PC 5170 (099): IBM PC 5170 (319/339): IBM PC 5140: IBM PC 5162: IBM PC 5155: IBM PC Expansion Unit 5161:
    WANTED! : IBM 5175 monitor, IBM 5145 monitor, IBM PC screws,
    My IBM PC hardware collection

  4. #34

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    Quote Originally Posted by mikey99 View Post
    Drivers and sample programs are in this zip, the scanned articles are also zipped but quite large.
    I'll try to find a place to upload these scans to and PM the link


    Attachment 44723
    I too would love a copy of the scanned articles. Thanks!

  5. #35

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    I apologize for bumping this older thread, but I am curious what diagnostic software you used to test your PGC? I used the IBM diagnostics that came with it, but it only gives me a numeric error code. I found a table online that gives me the descriptions, but it's still pretty vague. Did the diags you used actually tell you to replace that chip directly, or did you have to look up an error code?

  6. #36

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    I dont remember so well, software was IBM diagnostics or Advanced diagnostic disk. Also I tried it on IBM PC AT 6Mhz, so diagnostics disk for this computer may be different. I remember that I got exactly which memory chip is faulty.
    IBM PC 5150(A): IBM PC 5150(B): IBM PC 5160 (64-256k): IBM PC 5160 (256-640k): IBM PC 5170 (099): IBM PC 5170 (319/339): IBM PC 5140: IBM PC 5162: IBM PC 5155: IBM PC Expansion Unit 5161:
    WANTED! : IBM 5175 monitor, IBM 5145 monitor, IBM PC screws,
    My IBM PC hardware collection

  7. #37

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    well, I figured out why the diagnostics were giving me such a vague error. It was because a whole 8 out of the total 40 dram chips were bad, and that very much confused the diagnostics. Anyway, I already have another thread going about my specific issue, so I'm going to move over there to avoid duplicate threads going on.

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