National Instruments PC-TIO-10 User Manual page 50

Chapter 4
mov cx,[bp+6]
mov bx,1
shl bx,cl
mov cx,bx
not bx
in al,maskm
jmp $+2
and cl,al
and al,bl
out maskm,al
jmp $+2
in al,masks
jmp $+2
and ch,al
and al,bh
out masks,al
mov int_mask,cx
; restore saved registers
ii_exit:
pop es
pop ds
pop dx
pop cx
pop bx
pop ax
pop bp
sti
ret
_install_isr endp
; remove_isr
;
; bp reg at [bp+0]
; ret addr ofs at [bp+2]
; ret addr seg at [bp+4]
;
_remove_isr proc far
cli
push ax
push bx
push cx
push dx
push ds
push es
mov ax,seg _DATA
mov ds,ax
; see if our vector is installed--if not, do not remove the vector
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; get interrupt level
; generate some masks
; cx has 1 in bit pos of int-level
; bx has 0 in bit pos of int-level
; get mask data from master chip
; delay--wait for data transfer
; determine setting of mask bit
; enable interrupts for selected level
; delay--wait for data transfer
; get mask data from slave chip
; delay--wait for data transfer
; determine setting of mask bit
; enable interrupts for selected level
; save the previous value of the mask
4-17
Programming
PC-TIO-10 User Manual