第三题 code segment assume cs:code con8255 equ 0ff2bh pb8255 equ 0ff29h pa8255 equ 0ff28h
org 4100h start:
mov dx,con8255 mov al,80h out dx,al mov dx,pa8255 L0: mov al,0h out dx,al call delay mov al,0ffh out dx,al call delay jmp L0 hlt
delay: push cx mov cx,005h L3: mov bx,8000h L2: dec bx jnz L2 loop L3 pop cx ret code ends end start 第四题 code segment assume cs:code con8255 equ 0ff2bh pb8255 equ 0ff29h pa8255 equ 0ff28h
org 4200h start:
mov al,80h mov dx,con8255 out dx,al mov dx,pb8255 L0: mov al,0ffh mov cx,08h L1: clc rcl al,1 out dx,al call delay loop L1 mov cx,08h L2: stc rcr al,1 out dx,al call delay loop L2 jmp L0
delay: push cx mov cx,005h L3: mov bx,8000h
L4: dec bx jnz L4 loop L3 pop cx ret
code ends end start 实验四 3
code segment assume cs:code con8255 equ 0ff2bh pb8255 equ 0ff29h pa8255 equ 0ff28h p8259com0 equ 0ff80h p8259com1 equ 0ff81h intq3 equ interrupt3
org 4400h
start:mov al,80h
mov dx,con8255 out dx,al
mov ax,offset interrupt mov ds:[002ch],ax mov ax,0000h mov ds:[002eh],ax
mov al,13h mov dx,p8259com0 out dx,al
mov al,08h mov dx,p8259com1 out dx,al
mov al,09h out dx,al
mov al,11110111B out dx,al