Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 1Ch
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  Interrupt:   1Ch
 
  Title:       User Timer Service
 
  See also:    Timer Tick
 
  Description:                                          [PC] [AT] [PS/2]
 
     Invoked from Int 08h each time it executes.
 
     Default service is interrupt return (IRET). To trap Int 1Ch calls,
     a program must set up a handler routine to gain control when the
     interrupt occurs.
 
     Input     Output
 
     None      None
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