MOV AX ,123H ;ax==0123hMOV AL ,81H ;ax==0181hMOV AH ,96H ;ax==9681hMOV AL ,98H ;ax==9698hMOV AL ,AH ;ax==9696hADD AH ,AL ;ax==2c96h,cf==1ADC AX ,0DEH ;ax==2d76hSUB AX ,0FFFH;ax==1d77h