INT 13,1A - Format Unit (PS/2 model 50+)

AH = 1Ah

AL = defect table count

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

ES:BX = far pointer to defect table

CL = modifier bits

¦7¦6¦5¦4¦3¦2¦1¦0¦ Format Unit Modifier Bits

¦ ¦ ¦ ¦ ¦ ¦ ¦ +---- 1=ignore primary defect map, 0=use map

¦ ¦ ¦ ¦ ¦ ¦ +----- 1=ignore secondary defect map, 0=use map

¦ ¦ ¦ ¦ ¦ +------ 1=update secondary defect map, 0=don't

¦ ¦ ¦ ¦ +------- 1=do extended surface analysis, 0=don't

¦ ¦ ¦ +-------- 1=periodic interrupt status on, 0=off

+------------- reserved

returns nothing

- only the disk number is checked for validity

- see ~INT 13,STATUS~