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{{title|Relay Computer}} | {{title|Relay Computer}} | ||
− | [[File:Harvard Mark I.jpg|thumb|right|250px|The {{ibm|Harvard Mark I}}, a [[relay logic|relay-based]] computer, one of the earliest, made by | + | [[File:Harvard Mark I.jpg|thumb|right|250px|The {{ibm|Harvard Mark I}}, a [[relay logic|relay-based]] computer, one of the earliest, made by [[IBM]] in 1944.]] |
A '''relay computer''' is a computer system built primarily using electromechanical [[relay]]s and [[relay logic]]. Obsoleting most of the earlier [[mechanical computer]]s, relay were a short-lived technology during the late 1930s to early 1950s. By the late 1950s technology has shifted almost exclusively to [[vacuum tube]]s. From the mid 1950s onward, [[vacuum tube computer]]s superseded relay logic. | A '''relay computer''' is a computer system built primarily using electromechanical [[relay]]s and [[relay logic]]. Obsoleting most of the earlier [[mechanical computer]]s, relay were a short-lived technology during the late 1930s to early 1950s. By the late 1950s technology has shifted almost exclusively to [[vacuum tube]]s. From the mid 1950s onward, [[vacuum tube computer]]s superseded relay logic. | ||
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| [[BARK]] || || [[Matematikmaskinnämnden]] || 8,000 || 1950 || | | [[BARK]] || || [[Matematikmaskinnämnden]] || 8,000 || 1950 || | ||
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− | | [[WITCH | + | | [[WITCH]] || || [[Atomic Energy Research Establishment|Harwell]] || 480 || 1951 || Made with 480 [[relay]]s, 828 [[Dekatron valves]] for math |
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| {{etl|Mark I}} || || [[Electrotechnical Laboratory]] || || 1952 || | | {{etl|Mark I}} || || [[Electrotechnical Laboratory]] || || 1952 || |