The Digi-Comp 1 form I-Cor Systems was manufactured by E.S.R. for use as a demonstration toy in 1963. It initially sold for $4.99 which is $40 (£30) in 2019. The Digi-Comp 1 in our collection has been re-badged as I-Cor Systems for sale in the UK. The Digi-Comp demonstrates how to add binary with the use of three flip-flops and several control wires, the same principle as used in computers.