Largest Number in External Memory

    MOV R2, #4h             ;counter
    MOV DPTR, #3000h        ;External Memory
        MOVX A, @DPTR
L1:     MOV B, A
L2:     DJNZ R2, L3             ;counter check
        SJMP STP
L3:     INC DPTR
        MOVX A, @DPTR
        CJNE A, B, NEQ
        SJMP L2
NEQ:    JC L2
        SJMP L1
STP:    MOV R1, B
        END