Img 20190831 123655321

Selective Sequence Electronic Calculator

In January 1948 IBM announced its first large-scale digital calculating machine, the Selective Sequence Electronic Calculator (SSEC) Offsite Link. The SSEC was the first computer that could modify a stored program. It featured 12,000 vacuum tubes and 21,000 electromechanical relays.

The SSEC remained sufficiently influential in the popular view of mainframes that it was the subject of a cartoon by Charles AddamsOffsite Link published on the cover of The New Yorker magazine in February 11, 1961, in which the massive machine produced a Valentine's Day card for its elderly woman operator!

Back Home Next