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IBM's first large-scale digital calculating machine, the Selective Sequence Electronic Calculator (SSEC)IBM's first large-scale digital calculating machine, the Selective Sequence Electronic Calculator (SSEC), is announced. The SSEC is the first computer that can modify a stored program, and featured 12,000 vacuum tubes and 21,000 electromechanical relays.


IBM 604 Electronic Calculating Punch IBM introduces the IBM 604 Electronic Calculating Punch. The mass-produced 604 features the industry's first assemblage of digital electronics replaceable as a unit. Service engineers can simply pull out a defective unit of the 604 and plug in a replacement, reducing downtime.

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