Re: Rampage Plus 286 EMS boards programming info.

David Woodhouse (
Tue, 19 May 1998 22:09:23 +0200 said:
> It is an AST Rampage Plus 286 card.
> I have no idea how these cards work. What ports are used? IRQ's, DMA?
> Any pointers would be greatly appreciated.

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. 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.
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

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David Woodhouse, Robinson College, CB3 9AN, England. (+44) 0976 658355
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