汇编&端口

输出年月日 时分秒

assume cs:code , ds:data
data segment
    db 0
data ends
code segment
start:
    mov ax,data
    mov ds,ax
	mov cx,3
	mov di,100
	mov bl,0
	mov ah,0
    mov byte ptr ds:[0],0
st1:

	mov al,bl
    out 70h,al
    in al,71h
    call showptr
    sub di,2
    add bl,2
    add byte ptr ds:[0],1
    loop st1

    mov cx,3
    mov bl,7
st2:mov al,bl
    out 70h,al
    in al,71h
    call showptr
    sub di,2
    add bl,1
    add byte ptr ds:[0],1
    loop st2
    
    jmp start
    
    mov ax,4c00h
    int 21h
    
showptr:
	push cx
	push bx
	mov bx,0b800h
	mov es,bx
  s:
    mov dl,al
    and dl,0fh
    add dl,30h
    mov dh,02h
	mov word ptr es:[160*12+di],dx
    sub di,2

    shr al,4
    mov dl,al
    and dl,0fh
    add dl,30h
    mov dh,02h
	mov word ptr es:[160*12+di],dx
    ;mov byte ptr ds:[160*24+si+1],02h
    sub di,2h

    mov bh,02h
    mov bl,0h
    
    cmp byte ptr ds:[0],2
    je outp
    cmp byte ptr ds:[0],5
    je outp

    cmp byte ptr ds:[0],2
    jnb tp2
    mov bl,':'
    jmp outp
tp2:mov bl,'/'
    
    
    
outp:mov word ptr es:[160*12+di],bx
    
  e:pop bx
  	pop cx
  	ret


code ends
end start