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View Diary: A partial response to Bill Gates' op ed about teachers (247 comments)

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  •  And QDOS was a copy of CP/M (0+ / 0-)

    ported from the 8080 8-bit architecture to the 8086/8 16 bit architecture. It used the same Program Segment Prefix (PSP) that CP/M copied from DEC operating systems, and MS-DOS used a lot of the same interrupt handler structure as CP/M originally.

    There's a quote from Gary Killdall (DRI), who wrote CP/M originally for Intel, where Killdall asks Gates to explain why a certain interrupt handler returns a '$' character (which both CP/M and MS-DOS versions did). It appears to serve no function, but Killdall said he knew why it returned a '$' - and nobody at MS could, because Killdall wrote the code they copied nearly verbatim.

    We choose to go to the Moon in this decade and do the other things, not because they are easy, but because they are hard. - John F Kennedy

    by badger on Mon Feb 28, 2011 at 11:34:23 AM PST

    [ Parent ]

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