Int 15/AH=08h

IBM SurePath BIOS - WAIT REQUESTED TIME PERIOD

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 wait
Return:
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 wait
Return:
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

Category: Bios - Int 15h - I

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