ce1zzes@prism.gatech.EDU (Eric Sheppard) (10/06/90)
I want to be sure I am getting the correct chips for my 512k IBM AT board. It currently has 256k in the slots, with two banks empty. The chips in this board are strange; two chips are soldered together, and inserted in each socket. Are these 64k x 4 chips? Eric
schuster@cup.portal.com (Michael Alan Schuster) (10/06/90)
>I want to be sure I am getting the correct chips for my 512k IBM AT board. >It currently has 256k in the slots, with two banks empty. The chips in this >board are strange; two chips are soldered together, and inserted in each >socket. Are these 64k x 4 chips? No, they are 128K chips that are produced by soldering two special-pinout 64K chips back-to-back. Some chip houses still carry these. Be aware, though, that filling the motherboard will only get you 512K; you want 640. If I were you, I'd get a cheap 16-bit memory expansion card, and backfill ALL of the missing motherboard memory from that card, using cheap modern RAM chips. If you shudder at losing a slot, get one of those cards having serial/parallel I/O as well, so you'll be consolidating function.