The CX-22 has a switch to put it into real trackball mode. There are games that support it in real trackball mode too.
I meant as far as Centipede goes. I would like to find a list of games that actually support the TB mode. I assume they all be A8 games. Other than hacks there aren't any carts for either the 2600 or 7800 that utilized the TB setting is there?