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Programma 101, the very first PERSONAL COMPUTER ever: https://www.youtube.com/watch?v=WnItIQSwfSw

The Programma 101, also known as Perottina, was the first commercial “desktop computer”.[1][2] Produced by Italian manufacturer Olivetti, based in Piedmont, 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 usually called 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.Although, the concept of “stored program” allows this machine to be considered a true computer. [source: wikipedia]