daver@ux1.cso.uiuc.edu (07/18/90)
I bought a used XT several months ago and decided to learn about it's insides the hard way. I bought a 12 mhz mother board thinking I could just take my old one out and put my new one in. This is mostly true except that I found out that they don't use the same ram chips. The old one has one row of 256x1 chips, the new one requires 2 256x4 and 1 256x1. So I bought a set of 100ns chips and figured, hey, I've got 256k, but the dip switch on the board only started at 512. I went out and bought the second set. Here lies my problem. I also have an i/o board with memory. It has 384k in 64k chips. I figured that I could use it with 256k on the new mb and have 640. With the minimum at 512, I hoped that it would ignore that extra 256 on the card. It started to work. The ram check at the start up gets to 624 and says "parity error" I figure I have more ram than it is expecting, or it doesn't like 64k chips. So, I could just take off a bunch of 64k chips ( i need the i/o part of the board at the moment), but there are these 6 dip switches on the board that I assume tell it how much ram is there. Anybody know how to tell what brand of i/o-memory card I have? Anybody have an idea what switches to flip? (is it safe to experiment?) And while I'm at it, how do I tell how fast the chips are? Thanks ---------- David Ruby University of Illinois "This calls for a special blend of psychology and extreme violence" vyvyan