C64: Test kernal version

?peek(65408)

-> 170 = kernal version 1   (poke 1024,81 results in a white ball)
-> 0 = kernal version 2   (poke 1024,81 results in a blue ball which cannot be seen)
-> 3 = kernal version 3 (poke 1024, 81 results in a light-blue ball which is visible on screen)

Kernal version 3 is the one everyone uses.