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 Sutherland in the mid 1960s (1965-1966).
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. 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.
- Add time: 216 μs
- Frequency: 160 kHz
- Main memory:
- paper tape reader and punch
- keyboard made from parts of IBM Selectric typewriter
- Kleinschmidt teleprinter
- Physical specifications:
- Household inventory
- Manage all digital clocks through the house
- Real-time clock with delay of 1 second
- Air conditioning management
- TV and television antenna management, during school night children were required to answer the question 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
The Tin Men
- For the Future, a Household Computer. House & Garden. 130. Condé Nast Publications. Jul 1966. p. 30.
- Tomayko 1994.
- Cortesi 2015, p. 2.
- "The Family of The Future with their Computer". cortesi.smugmug.com.
- The ECHO IV Home Computer: 50 Years Later.
- "The End Bit: ECHO IV". The Computer Museum Report. 14 (Fall/Winter): last page. 1985.
- Cortesi 2015, p. 3.
- "ECHO 14 Plug-in Module". cortesi.smugmug.com. pp. 5–6.
- Living with ECHO-IV, 21:46.
- "ECHO-4". Amateur Computer Society Newsletter (8): 4 (49). Jan 1968. 102654910.
- Libes, Sol (July 1978). "Background: The First Ten Years of Amateur Computing". Byte Magazine. 3 (7): 64.
- Tomayko 1994, p. 61.
- Tomayko 1994, p. 60.
- Infield 1968, p. 79, 209.
- ACS Newsletter, Feb 1970, no. 5, p. 3 (96).
- Cortesi, Dave (Sep 2015). "The First Home Computer" (PDF). Volunteer Information Exchange. 5 (8): 2–3.
- Infield, Glenn (April 1968). "Science and inventions: A Computer in the Basement?". Popular Mechanics. 129 (4): 77–79, 209, 229.
- Tomayko, James E., ed. (1994). "Anecdotes: Electronic Computer for Home Operation (ECHO): The First Home Computer". IEEE Annals of the History of Computing. 16 (3): 59–61. doi:10.1109/mahc.1994.10011. ISSN 1058-6180.
- ECHO IV photos with description: "ECHO IV article - David & Marian Cortesi". cortesi.smugmug.com.
- Spicer, Dag. "The ECHO IV Home Computer: 50 Years Later | @CHM Blog | Computer History Museum". www.computerhistory.org.
- Computer History Museum (January 13, 2015), Living with ECHO-IV (video) (published 21 Feb 2018), Timecodes: 0:00 - What was "Advanced Technology" in 1965?, 13:55 - Was ECHO IV a Real Computer?, 23:46 - What Tasks did ECHO IV Perform?, 47:23 - Magazine and Newspaper Articles, 48:27 - Where is ECHO IV Now?, retrieved 2019-02-09
- "Amateur Construction of Computers: Building your own computer - Part 2: Completed Computers". Computers and Automation (1): 20–21. Jan 1972.