In the past few years, we have covered some of the most powerful chess computers on the market. The Saitek Travel Champion 2100 is from 1994. It is a portable, travel chess computer with a 10MHz processor with 1kb RAM. It has an estimated rating of 2000 ELO.
This computer has a peg sensory board. It runs on 4 AA batteries. It has lights and a display to show the moves.You can see it in action in the above video.