Hakase137 wrote:
Does it mean that 2.X and some 1.X features are supported?
VBE never really caught on for more than basic mode setting (and bank switching, before linear framebuffers were an option), so I expect most software that uses VBE will work fine with whatever you've got. VBE 2 made some breaking changes to both VBE 1 (removing fixed mode numbers) and VGA itself (removing the 8x14 font), so you may run into some software that gets upset over one of those two things.
Hakase137 wrote:
What about CGA?
The hardware is only partially compatible at best, but the BIOS calls are nearly identical, so some software will work. Maybe most software?
Hakase137 wrote:
I found "no MC6845 registers, unless a extra emulation mode is activated via mode utility", what does it mean?; does such an utility exist if needed for something? is it an emulation layer?
Some SVGA cards had a function to raise a NMI any time software tried to access CGA registers. A card-specific utility program would hook the NMI handler and program the SVGA registers to fit the intended CGA configuration. There's no utility program for either of your display adapters, and I doubt they're even capable of generating a NMI.