Program 101 (in the acronym P101) is an electronic table calculator developed by the Italian firm Olivetti in 1965. It is widely considered the first personal computer produced in the world.
It was designed by the engineer Pier Giorgio Perotto, in honor of the nickname Perottina, together with Giovanni De Sandre and Gastone Garziera.
The designer Mario Bellini gave it a decidedly modern and elegant look for the time.
It was born to respond to a recurring need in the technical-scientific field: the need was created for an intermediate machine between the electromechanical desk calculator and the large electronic processor (mainframe) managed by specialized technicians and shared among all users.
