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Int 15 Fn 86 - BIOS - Wait (at,ps) [B]
AH = 86h
CX:DX = interval in microseconds
Return: CF clear if successful (wait interval elapsed)
CF set on error or AH=83h wait already in progress
AH = status (see AH=84h)
Note: the resolution of the wait period is 977 microseconds on most systems
because most BIOSes use the 1/1024 second fast interrupt from the AT
real-time clock chip which is available on INT 70
See Also: AH=41h,AH=83h,INT 1A/AX=FF01h,INT 70
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