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int 13h, ah = 41h

Discussion in 'PC Hardware' started by Allan Adler, Oct 21, 2007.

  1. Allan Adler

    Allan Adler Guest

    According to the book, The Undocumented PC, by Frank Gilluwe, 2d ed,
    this interrupt subfunction, if it runs successfully, will leave some
    information in register CX in bits 2,1,0. When one of those bits is 1,
    it means something about availability of other subfunctions. In particular,
    subfunction 48h of int 13 will be available if any of those bits is 1.

    My question is this: if all of those bits are 0, does that mean that
    this subfunction didn't run successfully?
    Allan Adler, Oct 21, 2007
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