0:48Bh                   Diskette Media Control

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 last diskette
data rate selected and the step rate.

                      Diskette Media Control

7 6 5 4 3 2 1 0
x x . . . . . .      Last Diskette Drive Data Rate (see below)
. . x x . . . .      Last Diskette Drive Step Rate
. . . . x x x x      Reserved

               Last Diskette Drive Data Rate (bits 7 and 6)

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


0:48Bh Diskette Media Control