a.asm

微机原理——接口应用编程源码

stack segment stack
dw 64 dup(?)
stack ends
data segment
q6 db 'I am a good student'
q7 db 'I am a good teacher'
data ends
code segment
assume cs:code, ds:data 

start:

mov ax,data
mov ds,ax
push ds
mov ax,0000h
mov ds,ax
mov ax,offset IRQ6
add ax,2000h
mov si,0038h
mov [si],ax
mov ax,0000h
mov si,003ah
mov [si],ax
pop ds

mov ax,data
mov ds,ax
push ds
mov ax,0000h
mov ds,ax
mov ax,offset IRQ7
add ax,2000h
mov si,003ch
mov [si],ax
mov ax,0000h
mov si,003eh
mov [si],ax
pop ds

mov al,13h     ;icw1:要icw4,单8259，地址间隔4，边延触发
out 20h,al
mov al,08h     ;icw2：初始中断向量08h
out 21h,al
mov al,09h     ;icw4:8086系统，正常eoi，缓冲方式
out 21h,al     
mov al,3fh     ;ocw1:屏蔽中断位
out 21h,al


aa: sti
jmp aa
IRQ6:sti
     call delly
     mov ah,06h
     mov bx,offset q6
     int 10h
     mov al,20h
     out 20h,al
     IRET

IRQ7:sti
     call delly
     mov ah,06h
     mov bx,offset q7
     int 10h
     mov al,20h
     out 20h,al
     IRET

     delly proc
     push ax 
     push cx
     mov cx,1000h
a:   mov ax,1000h
     loop a
     pop cx
     pop ax
     delly endp

     code ends
     end start