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AH = 83h AL = subfunction 00h set interval CX:DX = microseconds to delay ES:BX -> byte whose high bit is to be set at end of interval 01h cancel wait interval
Return:
CF set on error or function already busy AH = status 80h invalid command (PC,PCjr) 86h function not supported (XT and later) CF clear if successful
Notes: The resolution of the wait period is 977 microseconds on many systems because many BIOSes use the 1/1024 second fast interrupt from the AT real-time clock chip which is available on INT 70. IBM AT 1984/1/10 BIOS ignores AL and always performs subfunction 00h
See Also: AH=41h - AH=86h - INT 70 - MEM 0040h:0098h - MEM 0040h:009Ch
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