0:491h                   Diskette Drive 1 Media State
 
 Length: 1 byte
 
    This byte is reserved for the PC, PCjr, PC XT dated 11/8/82, and the
    PC Convertible. For all others, this byte contains the state of the
    floppy diskette drive 1. See the description at address 0:490h for the
    format for the Diskette Drive Media State.

Seealso:
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