TITLE INT.MAC

;=======================================================================
; setInt (Number, Offset, Segment) -- Sets an interrupt vector (number)
;           to the code located at segment:offset
;       PreCond  --  None.
;       PostCond --  Nothing (no registers modified)
;=======================================================================
setInt  MACRO       Number, Offset, Segment
    push    ax
    push    dx
    push    ds

    mov     dx, Offset
    mov     ax, Segment
    mov     ds, ax
    mov     al, Number
    mov     ah, 25h
    int     21h

    pop     ds
    pop     dx
    pop     ax

ENDM

;=======================================================================
; getInt (Number, Offset, Segment) -- Gets an interrupt vector (number)
;           and returns the location of the code at segment:offset
;       PreCond  --  None.
;       PostCond --  Nothing (no registers modified)
;=======================================================================
getInt  MACRO       Number, Offset, Segment
    mov     al, Number
    mov     ah, 35h
    int     21h

    mov     Offset, bx
    mov     Segment, es

ENDM