In April 1969, Busicom approached Intel to produce a new design for an electronic calculator. They based their design on the architecture of the 1965 Olivetti Programma 101, one of the world's first tabletop programmable calculators.[5][6] The key difference was that the Busicom design would use integrated circuits to replace the printed circuit boards filled with individual components, and solid-state shift registers for memory instead of the costly magnetostriction wire in the 101.