the By using "LOOP" instruction , save number of ones inside Dx register into AL. if DX = 1234 h (ooo! colo od! o!oob) (ex) if AL=05 h CLUE:- 60 CF DX DEL AL-O - Made 16 times shift-left operation - in each shift-Left check af if CF = 1 ; that means the shifted-out bit = is one if Cf=o ; that the shifted out means bit is zero Increment AL whenever CF=1