oxalis@ccb.ucsf.edu (Michael Sintchak) (05/04/89)
Does anyone have experience using a DTK 286 motherboard (AT clone) with an expanded memory board (Rampage AT)? I've gotten the memory board to back-fill the 512k on my motherboard up to 640k, but I'd really like to have only 256k on my motherboard and have the memory board back-fill the rest (for Desqview purposes). It seems I can't have only 256k on my motherboard, the machine won't boot. I was under the impression AT's could work on only 256k main memory. This leads me to my next question: does anyone have experience using a BIOS other than DTK's in one of their motherboards? I've experienced excellent compatibility in the past, but once in a while I have to use non-standard program set-ups to get things to run. Will a "better" BIOS (e.g., Phoenix or AMI) give me better (i.e., perfect) compatibility? More importantly, will another BIOS even work :-) -- mike. ================================= Mike Sintchak (oxalis@ccb.ucsf.edu) Dept. of Pharm. Chem. - UC San Francisco =================================
dave@westmark.UUCP (Dave Levenson) (05/06/89)
In article <1939@ucsfcca.ucsf.edu>, oxalis@ccb.ucsf.edu (Michael Sintchak) writes: > ... It seems I can't > have only 256k on my motherboard, the machine won't boot. I was under > the impression AT's could work on only 256k main memory. The AT motherboard usually takes 18 256-k dram chips to make 512-k. If you remove 9 of these, you'll have 256-k, but you're removing every odd (or even) byte, not the upper half of the 512-k context. The CPU expects memory to be 16 bits wide. There's no way to make 256-k of 16 bit memory (i.e. 128-k 16-bit words) out of 256-k x 1 chips.