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AH = 08h AL = function 00h wait in increments of 15.025 microseconds CX = number of time increments to wait (0000h = maximum) 80h wait in increments of 840 ns ECX = number of time increments to wait 81h I/O event wait BH = bitmask of bits to check BL = expected pattern DX = I/O port address ECX = number of 840 ns microticks to waitReturn:
ECX = 00000000h if expected pattern did not occur 82h memory event wait BH = bitmask of bits to check BL = expected pattern ES:SI -> BYTE to check ECX = number of 840 ns microticks to waitReturn:
ECX = 00000000h if expected pattern did not occur other reserved
Return:
CF clear if successful CF set on error AH = status 00h successful 01h used 15.025 microsecond interval, time rounded up 08h reserved subfunction 86h function not supported
Notes: IBM classifies this function as optional. If the POST determines that the timer is nonfunctional, this function uses the 15.025 microsecond refresh timer instead of the full-resolution timer
See Also: AH=07h"IBM" - AH=09h"IBM" - AH=86h
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