Slightly different machine this time, since it uses the later
1977 GI AY-3-8610 PONG chip that added games like Basketball and Gridball
as well as a couple of shooting games. There was also auto or manual serve and
the ability to change both player sizes separately, not both together as before.
Usually this chip could be coupled with the AY-3-8615 colour picture
generator but looking at the board of this one it uses discrete circuitry to
product colour instead. Judging by the corrosion inside I'd also say it was
bust, but I haven't checked yet.