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The graphics card was used to map inside of the memory of IBM PC a set of routines which enhanced the CGA mode of displaying. Moreover, it offered an existing memory instead of the empty space which served for displaying a picture from more pixels than CGA. Also text mode processing was enhanced. The first graphics adapter was Hercules which allowed the excellent text mode characters. (Any program obviously had to know which graphics adapter is connected to IBM PC and most of them asked the user to specifiy it.)

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7y ago

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