Need Docs for XT RAM Board... - test-drb@ccmp.vtda.org

8 Nov 2006

I'll take a look. But I think all four rows are soldered in.

Thanks!!!

Al
...
  If it's an IBM XT mainboard, there's an easy
way to do this (and not use 
 up any expansion slots).

 Put 41256 chips in banks 0 and 1, and 4164s in banks 2 and 3 on the 
 mainboard. Put a 74S158 (or 74F158) multiplexer chip in the emptu socket 
 at the front right, pointing the same way as the chips around it. Set the 
 DIP switches for 256K RAM, and solder a jumper wire between pads E1 and E2.

 That's it. You have a 640K XT mainboard.

 -tony 