INT 13,18 - Set Media Type for Format (BIOS date specific)

AH = 18h

CH = lower 8 bits of number of tracks (0-1023 dec., see below)

CL = sectors per track (1-17 dec., see below)

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

on return:

ES:DI = pointer to 11-byte ~Disk Base Table~ (DBT)

AH = 00h if requested combination supported

= 01h if function not available

= 0Ch if not supported or drive type unknown

= 80h if there is no media in the drive

CF = 0 if successful

= 1 if error

- valid only for XT BIOS dated after 1/10/86, AT after 11/15/86,

XT 286 and the PS/2 line

- only disk number is checked for validity

- track 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¦4¦3¦2¦1¦0¦ CX

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

¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +-------------- high order 2 bits track/cyl count

+-------------------------- low order 8 bits of track/cyl count

- see ~INT 13,STATUS~