INTERRUPT

ORG 00H     ; SET ADRESS AS 00H
LJMP MAIN   ; LONG JUMP TO MAIN
ORG 0003H   ; SET ADDRESS AS 0003H
MOV A, #15H ; MOVE 15h INTO A
RETI        ; RETURN FROM INTERRUPT(EXIT FROM INTERRUPT)
ORG 0080H   ; SET ADDRESS AS 0080H
MAIN : MOV IE,#81H  ; SET IE REGISTER VALUE TO #81H
MOV A, #45H         ;MOVE 45H INTO A
SWAPPING: SWAP A    ; SWAPS VALUES TO 45H <-> 54H
SJMP SWAPPING       ; SHORT JUMP SWAPPING
END                 ; END OF PROGRAM]