ORG 0000H 
	LCALL START 		;; Should be LJMP START here -cb
ORG 0003H 
	LJMP ISR2 
ORG 000BH 
	LJMP DEBOUNCE 
ORG 0013H 
	LJMP ISR 
ORG 0050H 
ISR2: 	CLR EX0 
	MOV TL0,#00H 
	MOV TH0,#00H 
	SETB TR0 
	MOV A,R1 
	INC A 
	MOV R1,A 
RANGE2:CJNE R1,#01H,RANGE3 
	SETB P3.5 
	CLR P3.6 
	CLR P3.7 
	LJMP ER2 
RANGE3:CJNE R1,#02H,RANGE4 
	CLR P3.5 
	SETB P3.6 
	CLR P3.7 
	LJMP ER2 
RANGE4:CJNE R1,#03H,RANGE5 
	SETB P3.5 
	SETB P3.6 
	CLR P3.7 
	LJMP ER2 
RANGE5:CJNE R1,#04H,RANGE6 
	CLR P3.5 
	CLR P3.6 
	SETB P3.7 
	LJMP ER2 
RANGE6:CJNE R1,#05H,RANGE7 
	SETB P3.5 
	CLR P3.6 
	SETB P3.7 
	LJMP ER2 
RANGE7:CJNE R1,#06H,RANGE8 
	CLR P3.5 
	SETB P3.6 
	SETB P3.7 
	LJMP ER2 
RANGE8:CJNE R1,#07H,RANGE1 
	SETB P3.5 
	SETB P3.6 
	SETB P3.7 
	LJMP ER2 
RANGE1:CJNE R1,#08H,RANGE2 
	MOV A,#00H 
	MOV R1,A 
	CLR P3.5 
	CLR P3.6 
	CLR P3.7 
	LJMP ER2 
ER2:	RETI 
ORG 0250H 
DEBOUNCE: 
	CLR TF0 
	CLR TR0 
	JNB EX1, STEX1 
	JNB EX0,STEX0 
STEX1:	SETB EX1 
	LJMP ER3 
STEX0:	SETB EX0 
	LJMP ER3 
ER3:	RETI 
ORG 0350H 
ISR: 	CLR EX1 
	MOV TL0,#00H 
	MOV TH0,#00H 
	SETB TR0 
	MOV A,R0 
	INC A 
	MOV R0,A 

SINE:	CJNE R0,#01H,TRIANGLE 
	CLR P1.0 
	SETB P1.1 
	LJMP ER1 
TRIANGLE:CJNE R0,#02H,SQUARE 
	SETB P1.0 
	CLR P1.1 
	LJMP ER1 
SQUARE:	CJNE R0,#03H,SINE 
	MOV A,#00H 
	MOV R0,A 
	CLR P1.0 
	CLR P1.1 
	LJMP ER1 
ER1: 	RETI 
ORG 0500H 
START: 	MOV R0,#00H 		
	MOV R1,#00H 		
	MOV SP,#02FH 		
	MOV IE,#087H 		
	MOV TMOD,#01H 		
	MOV IP,#07H 
	SETB IT1 
	SETB IT0 
	;; This part of program requires a loop
	;; loop1:	...
	;;	...
	;; loop2:    SJMP LOOP1
END