Mail Archives: djgpp/1994/12/08/21:58:21
> So we simply need to add some VESA Bios Extension routine in a basic gfx
> library (without having to mess with CBGRX) and the toy will be back again,
> is this right?
For VESA cards, yes. For non-VESA cards, no.
> A question about that: in VBE paging can be done usign both interrupt and
> a far procedure call (an interrupt gives you the address to call).
> Are there any tourble calling such a thing from DPMI?
The interrupt is OK but slow (mode switch). The far call won't work
from protected mode, so there's another mode switch. 1.X added a
special option to map selector 0x40 to segment 0x40, but you can't
often do that in DPMI because 0x40 is a ring zero selector, and DPMI
often gives you lesser rings.
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