Programma 101 was the first commercial "desktop computer". It was produced by Italian manufacturer Olivetti and invented by the Italian engineer Pier Giorgio Perotto. It was launched at the 1964 New York World's Fair, volume production started in 1965. About 44,000 units were sold, primarily in the US. It is equipped with a 240 byte memory.
It is usually considered a printing programmable calculator or desktop calculator because three years later the Hewlett-Packard 9100A, a model that took inspiration from the P101, was advertised by HP as a "portable calculator", in order to be able to overcome the fears of computers and be able to sell it to corporations without passing through the corporate computer department.
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