Do an ALP programming to arrange numbers in decending order.

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ORG 0000H

MOV R4,#05H

AGAIN:MOV DPTR,#9000H

MOV R3,#05H

BACK:    MOVX A,@DPTR

MOV B,A

INC DPTR

MOVX A,@DPTR

MOV R1,A

CJNE A,B,TARGET

TARGET: 

JC NOEXCHANGE

MOV A,B

MOVX @DPTR,A

MOV A,R1

DEC DPL

MOVX @DPTR,A

INC DPTR

NOEXCHANGE:

DJNZ R3,BACK

DJNZ R4,AGAIN

END 

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