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  Description:  Set Date      [AT] [PS/2]
 
  Sets the date in the CMOS time/date chip.
 
  Input                                                         Output
  ═══════════════════════════════════════════════════           ═══════
  AH=05H                                                        Nothing
  CH=century (19 or 20) in binary coded decimal (BCD)
  CL=year in BCD
  DH=month in BCD
  DL=day in BCD
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