I went to the Louisville Arcade Expo Saturday, and picked up a Sears Team Play Basketball handheld. handheldmuseum.com has a picture of a very similar game, though the art on mine is a bit different. It says it's licensed from Coleco Head To Head Basketball.

http://www.handheldmuseum.com/Sears/TPBasketball.htm

http://www.handheldmuseum.com/Coleco/H2HBasketB.htm

It's easy to open up. The MCU is a TMS1000:

TMS1000NLL E
MP3320A
WE 8018
SINGAPORE

The PCB also says:

COLECO
(C) 1979
73796 / 73803 REV E


Also, I got to play an Atari Video Pinball Model C-380, which is a dedicated console. This one wasn't for sale, but I definitely found it more interesting than your typical Pong system. Pong Story describes it as using "possibly a microcontroller" labelled C011500-1.

http://www.pong-story.com/atpong2.htm