INT 13,C - Seek to Cylinder (XT & newer)

AH = 0C

CH = low order byte of cylinder number (see below)

CL = high order byte of cylinder number (see below)

DH = head number (0-15)

DL = fixed drive number (80h=drive 0, 81h=drive 1)

on return:

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

CF = 0 if successful

= 1 if error

- 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

- notice that CX is in reverse byte format similar to the way data

is stored in memory and reverse of normal register storage

- only the disk number is checked for validity

- the parameters in CX change depending on the number of cylinders;

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):

¦F¦E¦D¦C¦B¦A¦9¦8¦7¦6¦5-0¦ CX

¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +----- unused

¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +--------- high order 2 bits of track number

+------------------------ low order 8 bits of track number