The Minivac 601 Digital Computer Kit was an electromechanical digital computer created by Claude Shannon. The kit was sold by Scientific Development Corporation as early as 1961 as an educational kit for digital circuits. It used electrical relays as logic switches and for storage. It had a six-bit binary input/output array consisting of simple switches and indicator lights and a dial to input decimal numbers. Its design just barely allowed it to play winning Tic-Tac-Toe.
Our Minivac was donated by Dr. Richard Taylor, a System Source client. He received it as a gift for his Bar Mitzvah.