ECHO IV, or ECHO 4 (Electronic Computing Home Operator, or Electronic Computer for Home Operation) is a prototype of a home computer developed by

Westinghouse Electric The Westinghouse Electric Corporation was an American manufacturing company founded in 1886 by George Westinghouse. It was originally named "Westinghouse Electric & Manufacturing Company" and was renamed "Westinghouse Electric Corporation" in ...

engineer Engineers, as practitioners of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considering the limit ...

James (Jim) Sutherland in the mid 1960s (1965-1966).

History

James Sutherland worked as an engineer for the American company Westinghouse Electric, designing fossil and nuclear power plant control systems. In 1959 the company built a computer called PRODAC IV (he was the designer of the arithmetic logic unit), using destructive-readout core memory and NOR logic. When PRODAC IV was replaced by a

UNIVAC UNIVAC (Universal Automatic Computer) was a line of electronic digital stored-program computers starting with the products of the Eckert–Mauchly Computer Corporation. Later the name was applied to a division of the Remington Rand company an ...

design, some of the Westinghouse controller hardware was declared surplus in 1965. Sutherland took up surplus boards and memory to build a home computer, ECHO IV (the "IV" in ECHO IV came from the PRODAC IV). It was made public for the first time in 1966. The computer was working in the Sutherland's house until 1976, and was donated to the Computer Museum in Boston in 1984.

Technical specifications

* Processor ** Transistorized (2N404), with RTL NOR logic elements ** 120 circuit modules ** 18 commands ** 4 registers * Add time: 216 μs * Frequency: 160 kHz * Main memory: ** 8,192 15-bit words, magnetic core * Input/Output: ** paper tape reader and punch ** keyboard made from parts of IBM Selectric typewriter ** Kleinschmidt teleprinter * Physical specifications: ** Four large wooden cabinets, each with approximate dimension of: *** Width: 4 feet *** Height: 6 feet *** Depth: 2 feet ** Weight: about

Uses

* Accounting * Household inventory * Calendar * Manage all digital clocks through the house * Real-time clock with delay of 1 second * Air conditioning management * TV and television antenna management; on school nights children were required to answer questions if they wanted to watch television * Meteorological program for reading and storing data from a meteorological station that was connected to ECHO IV and weather forecast

References

Bibliography

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External links

*ECHO IV photos with description: * * *{{cite journal, title=Amateur Construction of Computers: Building your own computer - Part 2: Completed Computers, journal=Computers and Automation, date=Jan 1972, issue=1, pages=20–21, url=https://archive.org/details/bitsavers_computersA_7037108/page/n19 Home computers Pages with unreviewed translations Early microcomputers Computer-related introductions in 1966