www.ChessComputers.org

Model: Pocket Chess Computer 1450
Manufacturer: Radio Shack
Year: 1987
Est. ELO rating: n/a
Levels of play: 8
Type: Peg sensory

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Radio Shack Pocket Chess Computer 1450. Endorsed by Gary Kasparov.
I like this one because it's really thin. The manual says the 3 AAA batteries should give us over 300 hours of play time. The program is capable of under promoting. It has a schematic diagram at the end of the manual.  But the processor is only listed as "U1".
Even though the name Radio Shack is in it, it has a label saying:  Custom manufactured in Hong Kong by Scisys for Radio Shack.