INT 0x13 - 0x08 - Get Current Drive Parameters (XT & newer) [1]

Request/Call:

reg	value	descr
AH	0x08
DL	var	Drive number (0=A, 1=2nd floppy, 0x80=drive 0, 0x81=drive 1)
	0x_

reg	descr
CF	0 if successful 1 if error
AH	status (see INT 13,01)
BL	CMOS drive type 01 - 5^1/4: 360K 02 - 5^1/4: 1.2Mb 03 - 3^1/2: 720K 04 - 3^1/2: 1.44Mb
CH	cylinders (0-1023 dec. see below)
CL	sectors per track (see below)
DH	number of sides (0 based)
DL	number of drives attached
ES:DI	pointer to 11 byte Disk Base Table (DBT)

the track/cylinder number is a 10 bit value taken from the 2 high order bits of CL and the 8 bits in CH (low order 8 bits of track)
many good programming references indicate this function is only available on the AT, PS/2 and later systems, but all hard disk systems since the XT have this function available
only the disk number is checked for validity

bit	descr
0-5	sector number
6-7	high order 2 bits of track/cylinder
8-15	low order 8 bits of track/cyl number