Important Notice

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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     On PCs, PC/XTs, and PC/ATs with ROM BIOS dated earlier than
     11/15/85, ES:BX should point to a valid buffer.
 
     On fixed disks, the upper 2 bits of the 10-bit cylinder number are
     placed in the upper 2 bits of register CL.
 
     This function can be used to test whether a readable media is in a
     floppy disk drive. An error may result from the drive motor being
     off at the time of the request, because the ROM BIOS does not
     automatically wait for the drive to come up to speed before
     attempting the verify operation. The requesting program should
     reset the floppy disk system (Int 13h Function 00h) and retry the
     operation three times before assuming that a readable floppy disk
     is not present.
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