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  Description:  Set Day Count      [PS/2]
 
  Stores an arbitrary value in the system's day counter.
 
  Input                             Output
  ══════════════════════            ══════════════════════════════
  AH=0BH                            If function successful
  CX=count of days since            Carry flag=clear
     January 1, 1980                If function unsuccessful
                                    Carry flag=set
                                    -♦-