I'm glad you're rounding up help on the ROM hacking hardware front. A simple copy of the ROM is probably not what's necessary to get your card to do the higher resolutions at a lower bit-counts that you're after. It might be that simple, but we don't encourage the flashing of VidCard EEPROMs here and specifically prohibit the posting of links to Hacked Apple ROM SIMM files.

I'm not sure where we stand on tweaking the Declaration ROMs of 19 year old Video Cards made by a company that's about 16 years in the grave, but we'll work that out in the War Room.

Short version as I understand it:

Theoretical discussions about any kind of hardware, firmware or software hacking is encouraged here, playing with Paleolithic'puters is what we're all about. However the nitty-gritty of the physical ROM hacking procedure and linkage to stock ROM files is specifically prohibited by the rules. We've prohibited linkage to Apple's ROM files for emulation purposes from the very beginnings of the 68kMLA.