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                VESA    (vesa BIOS driver not included!)
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        Please reference vesa.h and testvl.c for sample code.

        I've currently tested these functions on an ATI VGAWonder with 512k
        memory and a plain ol' VGA monitor. They work fine, albeit slow. My
        VGA card is unfortunately one with only 1 page register and a 64k byte
        page size. This means that copying between pages means copying to 
        system memory, changing the page, and copying back. I haven't 
        experimented with 128k addressing or non-chain-by-4 (i.e. planar 
        memory) mode copying yet, but I'm going to. I suspect that one or both
        of these methods will allow us to do fast copies between pages.
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