Function selects media characteristics for the specified drive therefore A floppy disk must be present in drive INT 13H (0x13) Function 17H (0x17 or 23) Set disk type Function 18H (0x18 or 24) Set media type for format

INT 13H (0x13)

Function 17H (0x17 or 23) >> Set disk type

Call with: AH = 17H
AL = floppy disk type code

SL = drive
00H-7FH floppy disk

Returns: If function successful
Carry flag = clear
AH = 00H

If function unsuccessful
Carry flag = set
AH = status

Comments:

This function selects a floppy disk type for the specified drive.

INT 13H (0x13)

Function 18H (0x18 or 24) >> Set media type for format

Call with: AH = 18H
CH = number of cylinders
CL = sector per track
DL = drive
00H-7FH floppy disk

Returns: If function successful
Carry flag = clear
AH = 00H
ES: DI = segment: offset of disk
parameter table for media type

If function unsuccessful
Carry flag = set
AH = status

Comments:
This function selects media characteristics for the specified drive therefore A floppy disk must be present in the drive.

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