BIOS / Memory / 0040:008B


        0040h:008Bh         Diskette Media Control

Diskette Media Control
Bit	Dec	Hex	Description
0	1	01h	Reserved
1	2	02h
2	4	04h
3	8	08h
4	16	10h	Last diskette drive step rate
5	32	20h	Last diskette drive step rate
6	64	40h	Last diskette drive data rate
7	128	80h	Last diskette drive data rate

        Data Rate

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