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  Interrupt:   08h
 
  Title:       Timer Tick
 
  See also:    User Timer Service, Diskette Data
                   Memory, Timer Data Memory
 
  Description:                                          [PC] [AT] [PS/2]
 
     Invoked when timer chip decrements an internal counter to zero.
     Normally, this occurs an average of 18.2065 times per second.
 
     This interrupt should not be called directly. To trap Int 08h
     calls, a program must set up a handler routine to gain control
     when the interrupt occurs.
 
     Input     Output
 
     None      None
                                    -♦-