title: "count no.of 0's"
.model small
.stack 100h
.data
   num1 db 05h
   count db dup(0)
.code
   start:
   mov ax,@data
       mov ds,ax
       xor ax,ax
   mov al,num1
   mov cx,08
   mov bl,0 
   again: rol al,1
          jc noadd
          inc bl
   noadd:loop again
         mov count,bl
   mov ah,4ch
       int 21h
end  

*************************

title: "count no.of 0's"
.model small
.stack 100h
.data
   num1 db 0feh
   count db dup(0)
.code
   start:
   mov ax,@data
       mov ds,ax
       xor ax,ax
   mov al,num1
   mov cx,08
   mov bl,0 
   again: rol al,1
          jc noadd
          inc bl
   noadd:loop again
         mov count,bl
   mov ah,4ch
       int 21h
end