Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 25h
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  Interrupt:   21h     Function:   25h
 
  Title:       Set Interrupt Vector
 
  See also:    Get Interrupt Vector, Interrupt Vector Table,
               Terminate and Stay Resident, @SetInt
 
  Description:
 
     Initializes a CPU interrupt vector to point to an interrupt
     handling routine.
 
     Input                                   Output
 
     AH = 25h                                None
     AL = Interrupt number
     DS:DX = segment:offset of interrupt
             handling routine
                                    -♦-