Problem is, compaq just nuked the older than 286 series from their older section tech-ref. This machine is just run of mill 286 and the jumper and switch settings are on sticker stuck to top of drive cage or under the case cover. To set it up, you need special bootable setup disk. I can send you a file to help this by email attachment. I had 286 w/ 2MB all in 256K x 1 DIPs on motherboard itself. (!!) Whole machine is heavy and power supply fan is NOISY. Wizard

Hi, Count chips in one row (9 or 3), thats one row, then count number of rows. 286 uses two rows as one bank due to 16bit data path, compaq use 9th chip for parity. 16MB max. See where 386sx limitations come from except the brain-dead part which 286 got? Each bank can either have 64K (128K per bank) or 256K (512K per bank) , rarely can have 1MB chips (2MB per bank) but I don't think compaq 286 deskpro supports 1MB chips. That one I had has 72 x 256K x 1bit DIPs, taking up nearly 2/3 of the whole motherboard to bring up 2MB. Use 1.44MB generic FD on it. No problems and easier this way to get setup program to boot. Yeah, Very aucient and good idea of what things were like back then before all the mostly cheap clones few decent clones stuffed into either crappy flimsy finger cutting cases, some decent cases flooded the market. That little round 3 pin socket on back is 12V power for mono TTL monitor. Welcome! Cheers, Wizard