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    Wanted: Microsoft Mach 20 / Memory Plus

    Hi nikyo! I am apparently not getting notifications on thread replies. Very interested, please message me with details if you still have this. Thanks!
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    Wanted: Microsoft Mach 20 / Memory Plus

    Looking for a Microsoft Mach 20 CPU upgrade board, preferably with Memory Plus expansion. Our family IBM XT has one of these when I was growing up. I've resurrected the machine but had to use a V20 CPU, the Mach 20 and blanking plug were lost to time. Would love to have a Mach 20 so I can put...
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    IBM XT 640K mod: when it goes wrong

    So just a little note for anybody doing the 640K mod on the 64-256K motherboards: if your POST is stuck at "064 KB OK" once you're done, and you can't figure out why... The 256K chips go in banks 0+1, not 2+3. :roll: :lol:
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