> > Hercules Graphics Adapter
>
> This is not good enough, since there are non-hercules mda cards.
> Also, vga cards might emulate that port io aliasing as well.
The reliable way to detect an HGA card is to run through the VGA/EGA detect
and only if VGA/EGA fails then check that the light pen port is changing value
as you would expect. The light pen port check is used heavily - clone Herc
cards emulate its behaviour even if they dont have one
This is well documented in some of the PC video books
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This archive was generated by hypermail 2b29 : Sun Jul 09 2000 - 14:50:17 EDT