vtu 4th sem microprocessors hardware programes

program 1.b as per syllebus


.model small
.code
        mov ax,@data
        mov ds,ax
        mov dx,0e803h
        mov al,82h
        out dx,al
        mov dx,0e801h
        in al,dx
        mov cl,8
        mov ah,0
     n2:ror al,1
        jc n1
        dec cl
        jnz n2
        jmp nxt
     n1:inc ah
        dec cl
        jnz n2
    nxt:mov al,ah
        and al,01
        cmp al,00
        je dff
        mov al,0
        jmp next
    dff:mov al,0ffh
   next:mov dx,0e800h
        out dx,al
     
        mov si,05fffh
   ret2:mov di,0ffffh
   ret1:dec di
        jnz ret1
        dec si
        jnz ret2
        mov al,ah
        mov dx,0e800h
        out dx,al
        mov ah,4ch
        int 21h
        end