中断数码管一.asm

汇编程序

	assume cs:code
        code segment public
        org 100h
 
start: mov cx,0
          jmp start1
           segcod db 3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fh,77h,7ch,39h,5eh,79h,71h
start1:  cli
	mov dx,04a0h
        mov ax,13h
        out dx,ax			;ICW1, ICW4 NEEDED
        mov dx,04a2h
	mov ax,80h
	out dx,ax 	 	 	;ICW2 中断类型80h
	mov ax,01h
	out dx,ax   			;ICW4
	mov ax,00h
	out dx,ax    	              	;OCW1, 开放所有中断
	nop	              		;以上为8259初始化
        mov ax,0
	mov ds,ax
	mov di,200h  		   ;初始化中断向量表
	mov ax,offset int0
	mov ds:[di],ax
	add di,2
	mov ds:[di],100h           ;上述程序为芯片8259的初始化程序 
               sti 
     main: mov ax,7fh
               mov dx,04b0h
               out dx,ax
               
               jmp main
      
    int0: 	cli                                            ;关中断
	        nop
                mov si,offset segcod 
                mov bx,0                                            ;此两行为IR0的中断服务程序
circle1:    mov ax,100h
               mov ds,ax
               mov ax,[si+bx]
                mov dx,04b0h
	out dx,al 
                mov cx,50000
                lop1: loop lop1
                inc bx
                cmp bx,10h
                jne circle1
                mov dx,04a0h
                mov ax,20h
                out dx,al
                sti
	iret                                          ;中断返回


code ends
end start