微机原理8255实验代码

COM_ADD  EQU 0F003H
PA_ADD   EQU 0F000H
PB_ADD   EQU 0F001H
PC_ADD   EQU 0F002H
IO8259_0 EQU 0E000H
IO8259_1 EQU 0E001H
_STACK SEGMENT STACK
DW 100 DUP(?)
_STACK ENDS
_DATA SEGMENT WORD PUBLIC'DATA'
_DATA ENDS
CODE SEGMENT
 ASSUME CS:CODE,DS:_DATA,SS:_STACK
START:     MOV AX,_DATA
           MOV DS,AX
           MOV ES,AX
           NOP
           CLI
           MOV DX,COM_ADD
           MOV AL,86H
           OUT DX,AL
           MOV AL,5
           OUT DX,AL
           CALL Init8259
           CALL WriIntver
A1:        STI
           HLT
           JMP A1
Init8259   PROC NEAR
           MOV DX,IO8259_0