LEO tape (1958 – 1981)

The LEO (Lyons Electronic Office) was a series of mainframe computer systems, first used in 1951.

LEO was the first computer system used for commercial business applications, initially for J. Lyon and Co., and later for other companies when LEO systems were marketed after 1954.

Initially, punched tape and punched cards were used for input and output, with ¾-inch magnetic tape being used later on the LEO II series.

LEO series computers were still in use until 1981 by the GPO.

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