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AH = 41h AL = condition type (see #00463) 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
Return:
After event or timeout occurs
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
Bitfields for external event wait condition type: Bit(s) Description (Table 00463) 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 3 reserved 4 1=port address, 0=user byte 5-7 reserved
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