MOV R0,#20H
MOV R7,#0AH
MOV R2,#00H
MOV R3,#00H
MOV R4,#00H
LOOP: MOVA,@R0
JZX1
JNBACC.7 ,X2
INC R3
SJMPX3
X2:INC R2
SJMP X3
X1: INC R4
X3:INCR0
DJNZR7,LOOP