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Copyright 1991 David Jurgens |
INT 15,90 - Device Busy
AH = 90h
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
ES:BX = pointer to network control block if waiting for network
on return:
CF = 0 if wait not satisfied
= 1 if wait time satisfied
AH = when CF set, 80h for PC & PCjr, 86h for XT (BIOS 11/8/82)
- tells the OS a a program is about to wait for a device
- used for multitasking OS development
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| Esc or Alt-X to exit |
int 15,90 |
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