; Exchange four bytes at 50H-53H with 80H-83H
ORG 0000H
MOV R0,#50H
MOV R1,#80H
MOV R2,#04H
L1: MOV A,@R0
MOV B,A
MOV A,@R1
MOV @R0,A
MOV A,B
MOV @R1,A
INC R0
INC R1
DJNZ R2,L1
HERE: SJMP HERE
END
