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.

See also: 0:490h

0:491h Diskette Drive 1 Media State