INT 13,8 - Get Current Drive Parameters (XT & newer)

AH = 08

DL = drive number (0=A:, 1=2nd floppy, 80h=drive 0, 81h=drive 1)

on return:

AH = status (see ~INT 13,STATUS~)

BL = CMOS drive type

01 - 5¼ 360K 03 - 3½ 720K

02 - 5¼ 1.2Mb 04 - 3½ 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)

CF = 0 if successful

= 1 if error

% Cylinder and Sectors Per Track Format

¦F¦E¦D¦C¦B¦A¦9¦8¦7¦6¦5¦4¦3¦2¦1¦0¦ CX

¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +------------ sectors per track

¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +------------ high order 2 bits of cylinder count

+------------------------ low order 8 bits of cylinder count

- 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