Something like:
Code:
' test every location

bruteforce var byte
tencounter var byte
howeverlongittakestoseethedisplaywrittenlive var word

    tencounter = 0
    FOR bruteforce = $00 TO $FF
    
    READ tencounter, OUTP
    I2CWRITE SDA, SCL, bruteforce, OUTP
 
    tencounter = tencounter + 1
    IF tencounter > 9 THEN
    tencounter = 0
    ENDIF

    PAUSE howeverlongittakestobeabletoseethedisplaywrittenlive
    NEXT bruteforce