0:490h                   Diskette Drive 0 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 0.

                        Diskette Drive Media State

7 6 5 4 3 2 1 0
x x . . . . . .      Diskette Drive Data Rate (See below)
. . x . . . . .      Double Stepping Needed
. . . x . . . .      Media known
. . . . x . . .      Reserved
. . . . . x x x      Media/Drive Types (See below)


                   Diskette Drive Data Rate (Bits 7 and 6)

00        500K per second
01        300K per second
10        250K per second
11        Reserved


                    Media/Drive Types (Bits 2, 1, and 0)

000       360K/360K not established
001       360K/1.2M not established
010       1.2M/1.2M not established
011       360K/360K established
100       360K/1.2M established
101       1.2M/1.2M established
110       Reserved
111       None of the above

See also: 0:491h

0:490h Diskette Drive 0 Media State