MEM 0040h:008Bh - DISKETTE MEDIA CONTROL Size: BYTE Bitfields for diskette media control: Bit(s) Description (Table M0028) 7-6 last data rate set by controller 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps 5-4 last diskette drive step rate selected 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah 3-2 {data rate at start of operation} 1-0 reserved Note: EHD BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. sets this byte to 01h and never reads it back