; set item in interrupt vector table
; in:	bx	interrupt number
;	ds:dx	new handler address
ivt_set:
  push es
  push ax

  xor ax,ax
  mov es,ax

  sal bx,1
  sal bx,1

  mov [es:bx], dx
  mov [es:bx+2], ds

  pop ax
  pop es
  ret