I have a 386SX that I use to test my software on. I've always wished to
get some extra conventional memory by loading the DOS kernel and some
TSRs high, but none of the UMB drivers I tested worked with the chipset
of this mainboard, an UMC 82C336F chip codenamed "Twinstar".
Yesterday I dumped and disassembled the BIOS of this PC so I could
figure out how the BIOS configures the chipset's shadow RAM. Once I got
it, I made a driver that allows to transform up to 64K of shadow RAM
into UMBs. I published the result of this work today.
People having a mainboard based on the UMC UM82C33x "Twinstar" chipset
can now enjoy some UMBs.
http://mateusz.fr/twinumb/
Mateusz
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