* sample solution to HW5
RAM     equ     0
EEPROM  equ     $f800
RESET   equ     $fffe

        org     RAM
dest    rmb     1           * actually dynamic;  this will grow as needed

        org     EEPROM
src     fcc     '@AZ[`az{'  * test string looking for off-by-one errors

start   ldx     #src        * X will be used as pointer into source string
        ldy     #0          * Y will be used as index into dest string

top     ldaa    0,x         * get char from src string
        cmpa    #'a         * if char >= 'a...
        blt     noshift
        cmpa    #'z         * ...and <= 'z then
        bgt     noshift

        suba    #'a-'A      *    change to lower case

noshift staa    dest,y      * put upper case char in dest string
        beq     done        * if it was a null, we're done

        inx                 * update pointer
        iny                 * and index
        bra     top

done    bra     done        * end

        org     RESET
        fdb     start