Int 21 Fn 89  - European Ms-dos 4.0 - Sleep                                [D]

   AH = 89h
   CX = time in milliseconds or 0000h to give up time slice

Return: CF clear if successful
       CX = 0000h
   CF set on error
       AX = error code (interrupted system call)
       CX = sleep time remaining
Desc:  suspend the calling process for the specified duration

Notes: the sleep interval is rounded up to the next higher increment of the
     scheduler clock, and may be extended further if other processes are
     running
   this call may be interrupted by signals (see AH=8Dh)
   reportedly called by Microsoft C 4.0 startup code
   background processes have higher priority than the foreground process,
     and should thus periodically yield the CPU

See Also: AH=81h,INT 15/AX=1000h,INT 2F/AX=1680h,INT 7A/BX=000Ah