INT 15,91 - Interrupt Complete
AH = 91h on return: CF = 0 if successful = 1 if error AH = when CF set, 80h for PC & PCjr, 86h for XT (BIOS 11/8/82) AL = type code: = 00 disk = 01 diskette = 02 keyboard = 03 pointing device = 80 network (ES:BX = NCB) = FC fixed disk reset (PS/2) = FD diskette motor start = FE printer - should not be used by applications software - used by the BIOS to indicate device interrupt is complete - used for multitasking OS development