vtu 4th sem microprocessors hardware programs

program 2.b as per syllebus

.model small
.code
        mov dx,0e803h
        mov al,80h
        out dx,al
        mov al,0
        mov dx,0e800h
     up:out dx,al
        call delay
        add al,1
        daa
        call stop
        cmp al,99
        jne up
   down:out dx,al
        call delay
        add al,99
        daa
        call stop
        cmp al,0
        jne down
   stop:push ax
        mov ah,1
        int 16h
        jnz exit
        pop ax
        ret
   exit:mov ah,4ch
        int 21h
   delay:mov si,2fffh
   ret2: mov di,0ffffh
   ret1: dec di
         jnz ret1
         dec si
         jnz ret2
         ret
         end

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

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