CPU, you want to simulate the Atari hardware? I'd suggest coding your own engine in C, here's a link to the specs,
http://en.m.wikipedia.org/wiki/MOS_Technology_6507
He mean the enemy AI <img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" />
You can set the AI to move toward the pong in Y axis