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The Harvard Mark 1 is a room-sized, relay-based calculator.  The Mark 1 produced mathematical tables but was soon superseded by electronic stored-program computers.

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Physicist Stan Frankel, intrigued by small, general-purpose computers, developed the MINAC at Caltech. Used for science and engineering as well as simple data processing, the LGP-30 was a “bargain” at less than $50,000 and an early example of a ‘personal computer,’ that is, a computer made for a single user.

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HP employees, co-founder Bill Hewlett issues a challenge to his engineers in 1971: fit all of the features of their desktop scientific calculator into a package small enough for his shirt pocket. The HP-35 helped HP become one of the most dominant companies in the handheld calculator market for more than two decades.

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The Macintosh was introduced with a television ad during the 1984 Super Bowl. The Macintosh was the first successful mouse-driven computer. Cost $2500.00

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The Apple Watch was designed to be compatible with other devices. Almost a million units were ordered on the day of release. 