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Assembly Source File  |  1988-08-11  |  1.3 KB  |  25 lines
  1.         ;************************************************************;
  2.         ;                                                            ;
  3.         ;              Function 25H: Set Interrupt Vector            ;
  4.         ;                                                            ;
  5.         ;              typedef void (far *FCP)();                    ;
  6.         ;              int set_vector(intnum,vector)                 ;
  7.         ;                  int intnum;                               ;
  8.         ;                  FCP vector;                               ;
  9.         ;                                                            ;
  10.         ;              Returns 0.                                    ;
  11.         ;                                                            ;
  12.         ;************************************************************;
  13.  
  14. cProc   set_vector,PUBLIC,ds
  15. parmB   intnum
  16. parmD   vector
  17. cBegin
  18.         lds     dx,vector       ; Get vector segment:offset into
  19.                                 ; DS:DX.
  20.         mov     al,intnum       ; Get interrupt number into AL.
  21.         mov     ah,25h          ; Select "set vector" function.
  22.         int     21h             ; Ask MS-DOS to change vector.
  23.         xor     ax,ax           ; Return 0.
  24. cEnd
  25.