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  Description:  Event Wait      [AT] [PS/2]
 
  Requests setting of a semaphore after a specified interval or cancels
  a previous request.
 
  Input                                   Output
  ════════════════════════════            ═══════════════════════════════════
  If requesting event wait                If called with AL=00H,
  AH=83H                                  and function successful
  AL=00H                                  Carry flag=clear
  CX:DX=microseconds                      If called with AL=00H, and function
  ES:BX=segment:offset of                 unsuccessful (Event Wait already
                semaphore byte             active)
  If canceling event wait                 Carry flag=set
  AH=83H                                  If called with AL=01H
  AL=01H                                  Nothing
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