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The First Solid State Computer (April 1955 – December 1957)

In April 1955 IBM announced the development of the IBM 608 calculator, the first all solid-state (fully transistorized) computer commercially marketed. The machine was first shipped to customers in December 1957. Development of the 608 was preceded by prototyping an experimental all-transistor version of the 604. This was built and demonstrated in October 1954, but was not commercialized.