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Thread: IBM Parity Memory Card 128Kb Not working

  1. #21
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    Quote Originally Posted by modem7 View Post
    1. Leave RAM chip U50 in.
    Done

    Quote Originally Posted by modem7 View Post
    2. Using multimeter, ensure zero ohms (or very close to that) between pin A09 on card's ISA edge connector and pin 9 of U8 (the actual pin, not the solder side).
    0 Ohms measured

    Quote Originally Posted by modem7 View Post
    3. Using multimeter, ensure zero ohms (or very close to that) between pin 11 of U8 and pin 2 of RAM chip U50 (the actual pins, not the solder side).
    0 Ohms measured

    Quote Originally Posted by modem7 View Post
    4. Using multimeter, ensure zero ohms (or very close to that) between pins 2 and 14 of RAM chip U50 (the actual pins, not the solder side).
    If you mean pin 2 on U8, then I am reading 10Meg Ohms. If you mean pin 2 on RAM chip and 14 on the RAM chip, then yes I am getting 0 ohms.

    So I am thinking the conclusion here is that U8 is the most likely culprit here?

    IBM 5160 - 360k, 1.44Mb Floppies, NEC V20, 8087-3, 45MB MFM Hard Drive, Vega 7 Graphics, IBM 5154 Monitor running MS-DOS 5.00
    IBM PCJr Model 48360 640kb RAM, NEC V20,, jrIDE Side Cart, 360kb Floppy drives running MS-DOS 5.00
    Evergreen Am5x86-133 64Mb Ram, 8gb HDD, SB16 in a modified ATX case running IBM PC-DOS 7.10

  2. #22
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    Quote Originally Posted by lutiana View Post
    So I am thinking the conclusion here is that U8 is the most likely culprit here?
    My money is on U8 too.

  3. #23
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    So I picked up a 512Kb RAM card (the IBM one) and plugged it in, same error message. But am I correct in saying that this card cannot be used to fill the RAM to 640KB? Or are there jumper settings that would allow me to do this?


    The manual shows how to configure the card as the 1st, 2nd, 3rd etc, and the jumpers are set to the 1st card.

    On another note, I managed to find what I think is an Enhanced Memory Expansion Adapter, which should arrive this weekend. Not sure how much RAM on that card, but time will tell.

    IBM 5160 - 360k, 1.44Mb Floppies, NEC V20, 8087-3, 45MB MFM Hard Drive, Vega 7 Graphics, IBM 5154 Monitor running MS-DOS 5.00
    IBM PCJr Model 48360 640kb RAM, NEC V20,, jrIDE Side Cart, 360kb Floppy drives running MS-DOS 5.00
    Evergreen Am5x86-133 64Mb Ram, 8gb HDD, SB16 in a modified ATX case running IBM PC-DOS 7.10

  4. #24

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    Correct.

  5. #25
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    Quote Originally Posted by lutiana View Post
    So I picked up a 512Kb RAM card (the IBM one) and plugged it in, same error message. But am I correct in saying that this card cannot be used to fill the RAM to 640KB? Or are there jumper settings that would allow me to do this?
    Quote Originally Posted by bear View Post
    Correct.
    "What bear said."

    Extended memory only.
    '1st' setting = 1M to 1.5M
    '2nd' setting = 1.5M to 2M
    '3rd' setting = 2M to 2.5M
    '4th' setting = 2.5M to 3M
    '5th' setting = 3M to 3.5M

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