National Instruments PC-DIO-96 User Manual page 62

Register-Level Programming
; on input, isr_block points to the data structure that will be used by
; the isr_handler function
;
; void isr_handler(void);
;
; the isr_handler() function will never be called from C.....
;
; void remove_isr(void);
;
public _install_isr, _isr_handler, _remove_isr
_DATA segment word public 'DATA'
; declarations
ackm equ
acks equ
eoi equ
maskm equ
masks equ
int_addr dd
int_mask dw
isrb_addr dd
slave_ack db
vect_num db
_DATA ends
_TEXT segment word public 'CODE'
assume cs:_TEXT, ss:_TEXT, ds:_DATA
; install_isr
;
; bp reg
; ret addr ofs
; ret addr seg
; level
; isr_block ofs
; isr_block seg
;
_install_isr
cli
push
mov
push
push
push
push
push
push
mov
mov
; save the pointer for the isr_block structure--used in isr_handler
PC-DIO-96 User Manual
00020h
000a0h
00020h
00021h
000a1h
0
0
0
0
0
at [bp+0]
at [bp+2]
at [bp+4]
at [bp+6]
at [bp+8]
at [bp+10]
proc far
bp
bp,sp
ax
bx
cx
dx
ds
es
ax,seg _DATA
ds,ax
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Chapter 4