INT 15H 91H: Interrupt Finished
Expects: AH 91H
AL device type: 00H fixed disk time-out
01H diskette time-out
03H pointed device time-out
21H waiting foe keyboard input
fcH fixed-disk reset time-out
fdH diskette drive motor start
feH pointing device time-out
ES:BX addr of network control block (if AL = 80H or higher)
CF must be NC (0) before calling
Info: This service is designed to be intercepted by a multitasking
operating system. It could be used by disk or other hardware
handlers so the handler can be notified when I/O is completed.
This fn could also be used by an operating system to learn when
I/O is completed so the requesting task could be reactivated.
When unintercepted, the BIOS simply sets AH to 0 and clears CF.
See Also: INT 15H (extended AT services)
BIOS Data Area