*
*  HW4
*
*  Purpose: sum up all the values from 1 to n
*
*  Author: Heather D. Pfeiffer
*
RAM     equ    $0010
EEPROM  equ    $f800
RESET   equ    $fffe

* Save space in RAM for the sum
	org    RAM
sum     rmb    1

* Program code where constant n is stored
*    at top of program
	org    EEPROM
n       fcb    $0f
start   ldaa   #0	* initialize sum
        ldab   n        * initialize count down
again	beq    next     * while (countdown != 0)
	aba             *    sum = sum + countdown
	decb
	bra    again    * end while
next    staa   sum      * store sum
	
endloop bra    endloop  * dead loop

* Setup reset vector
	org    RESET
	fdb    start