Busicom had designed their own special-purpose LSI chipset for use in their Busicom 141-PF calculator with integrated printer. They based their design on the architecture of the Olivetti Programma 101, one of the world's first tabletop programmable calculators, which Olivetti introduced in 1965. Busicom commissioned Intel to develop their design for production. Like the Olivetti Programma 101, the Busicom design used serial read-write memory. The Busicom memory was based on MOS shift registers rather than the costly Olivetti memory based on magnetostriction wire.