Thinking out loud. . . . Most (almost all) PCI display adapters are VGA-compatible (not concerned about VGA BIOS extensions, which would require an x86 emulation layer, but just the layout of the card itself). So, given knowledge of the inner workings of the various PCI busboards and an MMU, wouldn't it be possible to write a ROM update that sets up the MMU to monitor changes to chip RAM, intializes the display adapater, and updates the display as appropriate? Or would this be too slow to be useful (pixel conversion, memory reads/writes, etc.)?
Trev