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The first desktop and mass-market computer. In 1964, the first desktop computer, the Programma 101, was unveiled to the public at the New York World's Fair. It was invented by Pier Giorgio Perotto and manufactured by Olivetti. About 44,000 Programma 101 computers were sold, each with a price tag of $3,200.
ENIAC was preceded in 1941 by the German Z3, which was the first general purpose, programmable electro-mechanical computer. It was also preceded by the Colossus, which was built in 1944 in the UK and which was all electronic and reprogrammable by rewiring but was not general purpose (it was used only for code breaking).he IBM ASCC (Automatic Sequence Controlled Calculator), delivered to Harvard University in the same year, was the first large-scale automatic digital computer in the U.S. Whereas the Z3 and ASCC used electro-mechanical relays in their arithmetic operations, the Colossus and ENIAC utilized vacuum tubes.