For reference, wanted to document some attempts I made with a few of these BIOSes on a Diamond Flower 386/25-33-40UCE Rev A board. (Board is extremely similar to the 386/33-40UCE that has available jumper info online-- but it isn't the same board! The locations of everything are moved around ever so slightly...) The board uses the UMC UM82C481BF/UM82C482AF chipset. That lines up with the following files listed earlier in the thread:
V037B301 UMC_301 UMC WriteBack 82C48X 386 WriteBack, Rev 0 *ONLY*
V037B302 UMC_302 UMC WriteBack 82C48X 386 WriteBack, Rev A,B *ONLY* (Not REV-0 !)
V037B304 UMC_304 UMC WriteBack 82C48X 386 WriteBack, Rev A,B *ONLY* (Not REV-0 !) x037b302, for Cyrix layout with A20M and FLUSH
None of these worked 100% correctly. V037B301 just causes the speaker to emit a low tone (probably expected since it's "Rev 0 Only"). V037B302 and V037B304 boot fine but only detected memory in Bank 0. (I have eight 1MB SIMMs installed across Bank 0 and Bank 1, which are detected and functional on the original AMIBIOS). I don't expect there's really a solution to this, but I thought I'd report it as it could affect other UM82C48x boards.
Wafflenet OPL Archive - Preserving MS-DOS music in a unified format!