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IBM XT 640K mod: when it goes wrong

brtb

New Member
Joined
May 24, 2020
Messages
4
Location
FL
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:
 

brtb

New Member
Joined
May 24, 2020
Messages
4
Location
FL
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