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IBM 2.0 Megabyte Expanded Memory Card

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    IBM 2.0 Megabyte Expanded Memory Card

    I picked up a PS/2 8530 this weekend; I had originally thought it was 286 model but I had said I'd buy it since it came with some nice accessories (the 5.25 HD external disk drive and controller card) but one thing the seller mentioned to me was that it has the 2 meg card installed inside; I thought to myself without asking for clarification; was this really the 286 model but pictures and looking at the back of the system unit indicated to me otherwise. It wasn't until I got to my overnight destination did I get a chance to root through some of the stuff did I see, it was a 2 meg expanded memory card. Now the documentation says this thing is only compatible with the the 8530 (8086), the PC XT, and the PC AT.

    I wonder a couple of things?

    If it works in an 8530 (8086) surely it would work in the 8525 (8086) wouldn't it?
    Would it work in a 5150 or (since I also have a 5161 would it work in there)

    It is an interesting card; it also has a LPT port on it which can be set as disabled, primary, or secondary LPT port.
    Daniel P. Cayea - The Lyon Mountain Company - Plattsburgh, New York 12901
    Vintage Equipment: IBM 5150 * IBM 5161 * ThinkPad 770ED
    Modern Equipment: MacBook Pro 13 * Alienware M15R3

    #2
    I'm like 99% sure, the 25/30 are identical motherboards. at least between 8086 and 286

    also are you talking about that giant 16-bis isa card with 16 30-pin simm slots?
    It is a mistake to think you can solve any major problems just with potatoes.

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      #3
      The 3905 and 3910 were cards designed for the 3270. XMA and able to be used as EMS 3.2 only. If that is the card, I doubt it would fit in the Model 25. Should work but would be hanging out the case.

      The XT/286 is specifically called out as not working in the product reference. I think a 5150 might work with it if the motherboard has 256 K. The notes regarding the board mention backfilling from 256 K. Haven't tested the 5150 so that may be wrong. If it works on the Model 30, it doesn't need any 3270-PC cards.

      Canada - IBM System Unit provides a little information on the card and the required drivers. NEW MODELS OF THE IBM 3270-PC (5271) AND EXPANDED MEMORY ADAPTER (XMA) might provide a little more.
      Last edited by krebizfan; April 25, 2021, 10:30 PM.

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