The RAYDAC (for Raytheon Digital Automatic Computer) was a one-of-a-kind computer built by

Raytheon Raytheon Technologies Corporation is an American multinational aerospace and defense conglomerate headquartered in Arlington, Virginia. It is one of the largest aerospace and defense manufacturers in the world by revenue and market capitaliza ...

. It was started in 1949 and finished in 1953. It was installed at the

Naval Air Missile Test Center Pacific Missile Test Center (PMTC) is the former name of the current Naval Air Warfare Center, Weapons Division. The name of the center was the Naval Air Missile Test Center prior to PMTC. It is located at Naval Base Ventura County/Naval Air Stat ...

Point Mugu Point Mugu (, Chumash: ''Muwu'') is a cape or promontory within Point Mugu State Park on the Pacific Coast in Ventura County, near the city of Port Hueneme and the city of Oxnard. The name is believed to be derived from the Chumash Indian term ...

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

. The RAYDAC used 5,200

vacuum tube A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric voltage, potential difference has been applied. The type kn ...

s and 18,000 crystal

diode A diode is a two-terminal electronic component that conducts current primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance in one direction, and high (ideally infinite) resistance in the other. A diode ...

s. It had 1,152

words A word is a basic element of language that carries an objective or practical meaning, can be used on its own, and is uninterruptible. Despite the fact that language speakers often have an intuitive grasp of what a word is, there is no consen ...

of memory (36

bit The bit is the most basic unit of information in computing and digital communications. The name is a portmanteau of binary digit. The bit represents a logical state with one of two possible values. These values are most commonly represente ...

s per word), using

delay-line memory Delay-line memory is a form of computer memory, now obsolete, that was used on some of the earliest digital computers. Like many modern forms of electronic computer memory, delay-line memory was a refreshable memory, but as opposed to modern ra ...

, with an access time of up to 305

microsecond A microsecond is a unit of time in the International System of Units (SI) equal to one millionth (0.000001 or 10−6 or ) of a second. Its symbol is μs, sometimes simplified to us when Unicode is not available. A microsecond is equal to 1000 n ...

s. Its addition time was 38 microseconds, multiplication time was 240 microseconds, and division time was 375 microseconds. (These times exclude the memory-access time.)

References

One-of-a-kind computers Vacuum tube computers Raytheon Company products {{compu-stub

See also

References