Like the Colossus, ENIAC required rewiring to reprogram until September 1948. Three months earlier, in June 1948, the Manchester Small-Scale Experimental Machine (SSEM) ran its first program and earned the distinction of first stored-program computer. Though the idea of a stored-program computer with combined memory for program and data was conceived during the development of ENIAC, it was not initially implemented in ENIAC because World War II priorities required the machine to be completed quickly, and ENIAC's 20 storage locations would be too small to hold data and programs.

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