First post, by AlaricD
I have an M-321 rev 2.6 (or 2.7?) board and recently acquired four 30-pin, 16MB SIMMs, hoping to bring it up to 64MB or potentially 80MB by having four 4MB SIMMs in the other bank, but the RAM counts up to only 16000 bytes with those 16MB SIMMs in either Bank 0 or Bank 1 and the other bank left unpopulated. I'm not sure if it's a BIOS thing or a chipset thing, or if Address 11 or Data 7 are not connected somewhere (since the board was probably built with the idea that noöne in their right mind would ever install 64 or 128MB of RAM in a 386).
I've seen videos of the M-326 board using four 16MB SIMMs (a video in which someone 'ran' a Quake 3 timedemo, the YouTube video ID is DlxlOtupnUc) and so thought that perhaps my M-321 would also support that much RAM. I've tried with parity on and off (they are 60ns, 9-chip SIMMs with parity) but the memory count remains at 16000 either way.