Video hardware detection?

[Lionel Pinkhard <lionelp@worldonline.co.za>]

Hey guys/girls!

I have another question about the Hercules: How do I distinguish between a
Hercules and MDA adapter? (I mean, using software :-) )

Basically, I'm reading from ports 0x3b0 through 0x3b8, and if I get any
value between those that aren't 0xff, then I assume a HGA/MDA is
installed, but how do I know which one? Since, AFAIK anyway, it isn't
possible to do graphics on an MDA, but it is definitely possible on a
Hercules. Now, just to be polite, I wouldn't want my game to crash on a
system with an MDA adapter, I'd rather write a friendly message to
b000:xxxx instead :-).

Hope somebody can help me out here? BTW Is my detection routine okay? It's
just something I thought up, since AFAIK if an adapter isn't installed,
it's ports read out 0xff all the way, but somebody correct me if I'm
wrong, please.

Caio,

Lionel

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