It's probably very simple. It'll map its memory a page at a time into a
selected area of high memory, and you tell it which page you want to see by
outputting a byte/word to an IO address.
mharris@ican.net said:
> I have the MSDOS driver for the card, and could possibly reverse
> engineer it, but I don't know how .SYS files load under DOS. Any
> ideas?
Hehe - One or two. http://www.imladris.demon.co.uk/devload/
There's a lot of documentation on the layout of DOS device drivers. I'm not
sure if I've linked any from there, but there's some sample source for one,
at least.
Scan the driver for outb instructions, and it will probably make itself very
clear.
---- ---- ----
David Woodhouse, Robinson College, CB3 9AN, England. (+44) 0976 658355
Dave@imladris.demon.co.uk http://www.imladris.demon.co.uk
finger pgp@dwmw2.robinson.cam.ac.uk for PGP key.
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