Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 15h Function C2h Subfunction 04h
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  Interrupt:   15h     Function:   C2h     Subfunction:   04h
 
  Title:       Get Pointing Device Type
 
  Description:                                                    [PS/2]
 
     Returns the identification code for the system's mouse or other
     pointing device.
 
     Input        Output
 
     AH = C2h     If function successful
     AL = 04h       Carry flag: clear
                    AH = 00h
                    BH = Device ID
 
                  If function unsuccessful
                    Carry flag: set
                    AH = Status
                         See: Int 15h Function C2h
                              Subfunction 00h
                                    -♦-