汇编语言(王爽)--实验14 访问CMOS RAM

assume cs:code,ds:data

data segment
    db 9,8,7,4,2,0
    db '00/00/00 00:00:00'
data ends

code segment 
start: 
       mov ax,data   ;
       mov ds,ax
       mov si,0
       mov di,6 
       mov cx,6
    s0:mov al,ds:[si]     
       out 70h,al
       in al,71h
       
       mov ah,al
       shr ah,4      
       add ah,30h
       mov ds:[di],ah
       
       and al,00001111b 
       add al,30h
       mov ds:[di+1],al
       
       add di,3
       inc si      
       loop s0 
       
       mov cx,17
       mov si,6
       mov di,0
       
    s1:mov ah,ds:[si]           
       mov bx,0b800h
       mov es,bx
       mov byte ptr es:[160*12+40+di],ah
       inc si
       add di,2
       loop s1
       mov ax,4c00h
       int 21h
code ends

end start