[<<Previous Entry]
[^^Up^^]
[Next Entry>>]
[Menu]
[About The Guide]
Int 15 Fn 41 - System - Wait On External Event (convertible And Some Oth [B]
AH = 41h
AL = condition type
bits 0-2: condition to wait for
0 any external event
1 compare and return if equal
2 compare and return if not equal
3 test and return if not zero
4 test and return if zero
bit 3: reserved
bit 4: 1=port address, 0=user byte
bits 5-7: reserved
BH = condition compare or mask value
BL = timeout value times 55 milliseconds
00h means no timeout
DX = I/O port address if AL bit 4 set
ES:DI -> user byte if AL bit 4 clear
Note: call AH=C0h and examine bit 3 of feature byte 1 to determine whether
this function is supported
See Also: AH=83h,AH=86h,AH=C0h
This page created by ng2html v1.05, the Norton guide to HTML conversion utility.
Written by Dave Pearson