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HDOS is an early microcomputer operating system, originally written for the Heathkit H8 computer system and later also available for the Heathkit H89 and Zenith Z-89 computers.
Early versions of AutoCAD were released for the Z-100 because of these advanced graphics.
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Jerry Pournelle in June 1983 praised the Z-100's keyboard, and wrote that it "had the best color graphics I've seen on a small machine".