In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Heineken wrote:

hello,

sorry for the mistakes the code had, thats the correct code 

[code]
device SX28L, OSCHS,TURBO
reset start_point
freq 4000000                   ;4Mhz resonator

 		org	8
addend 		ds	1
adder		ds	1
Sum		ds	1
Subtrahend	ds	1	
subtractor	ds	1	
difference	ds	1	
X		ds	1

		 org       0 	; begin code on page 0
start_point      mov     !ra,#$f    ; all of port A lines are input              
	  	 mov     !rb,#$ff   ; all of port B lines are output
 
; main program starts here
arithloop	mov     Addend,#137  ; Addend value
		mov     X,Addend
		call      output	; display Addend
 
		mov	Adder,#27    ; Adder Value
		mov	X,Adder
		call	output	     ; display Adder
		
		mov	Sum,Addend    ; first value in Sum  
		add	Sum,Adder	; perform addition
		mov	X,Sum
		call	output	; display Sum
 



 
		mov	Subtrahend, #137	; Subtrahend value

		mov	X,Subtrahend
		call	output	; display Subtrahend

		mov	Subtractor,#27; Subtracter Value
		mov	X, Subtractor
		call	output	; display Subtracter
 
		mov     Difference,Subtrahend ; first value in Difference
		sub      Difference,Subtractor     ; perform subtraction
 
 

		mov     X,Difference   ; display Difference
		call      output
		jmp      arithloop	; start again

; The subroutine defined below displays the value contained in X at LEDs attached to all
;	lines of Port B
output  	mov	W,X   
		not	W  ; invert the bits, l's complement
		mov	rb,W
ra0ontest     	jb      ra.0,ra0ontest
ra0offtest	jnb	ra.0,ra0offtest
ra1ontest 	jb	ra.1,ra1ontest
ra1offtest 	jnb	ra.1,ra1offtest
		ret
 [/code]

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