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  Description:  Get Tick Count      [AT] [PS/2]
 
  Returns the contents of the clock tick counter.
 
  Input             Output
  ══════            ═══════
  AH=00H            AL=rolled-over flag
                       00H if midnight not passed since last read
                       <>00H if midnight was passed since last read
                    CX:DX=tick count (high 16 bits in CX)
                                    -♦-