Video Displays@ Video IO@ Display IO@
IBM's official method of recognizing their original EGA graphics card was to look for the string "IBM, Inc." (or something like that) at a certain address in the card's ROM. 3rd party EGA cards simply put "Not a product of " in front of it - satisfying the protocol, without committing a copyright violation.
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<A HREF="http://techref.massmind.org/techref/io/video/graphics.htm"> Video Graphics IO</A>
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