Meet the CXG Portachess: a portable chess computer from the 1980s that can give you a good game. The CXG-202 was first introduced in 1983. It has a 0.4 Mhz processor with 80 bytes of RAM. It has 16 levels and a peg sensory board. You can follow the moves with LEDs.
The below video shows this electronic chess board in action.