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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    This function call can be captured by a program so that it will be
    notified as each cylinder is formatted or analyzed. The program can
    count interrupts for each phase to determine the current cylinder number.
 
    The ROM BIOS default handler for this function returns with the carry
    flag set.
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