Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 1Ah Function 00h
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  Interrupt:   1Ah     Function:   00h
 
  Title:       Get Tick Count
 
  See also:    Timer Data Memory
 
  Description:                                               [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)
                                    -♦-