Engineering:ECHO IV

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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 engineer James (Jim) Sutherland in the mid-1960s (1965-1966).[1][2][3]

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 design, some of the Westinghouse controller hardware was declared surplus in 1965.[3][2] 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.[4][2]

The computer was working in the Sutherland's house until 1976, and was donated to the Computer Museum in Boston in 1984.[2][5][6]

Technical specifications

  • Processor
  • Add time: 216 μs
  • Frequency: 160 kHz[11][5][10]
  • Main memory:
  • Input/Output:
    • paper tape reader and punch
    • keyboard made from parts of IBM Selectric typewriter
    • Kleinschmidt teleprinter
  • Physical specifications:
    • Four large wooden cabinets,[13] each with approximate dimension of:
      • Width: 4 feet
      • Height: 6 feet
      • Depth: 2 feet[3]
    • Weight: about 800 pounds (360 kg)[13]

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[14]

References

Bibliography

External links