Semiconductor & Computer Engineering
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The idea of using [[relay]]s to realize [[logic circuit]]s was not new even in the 1920s. However it was not until the late 1930s that actual full-scale computers and calculators were developed. However, it was not until the end of [[wikipedia:World War II|World War II]] that a large number of systems were built. | The idea of using [[relay]]s to realize [[logic circuit]]s was not new even in the 1920s. However it was not until the late 1930s that actual full-scale computers and calculators were developed. However, it was not until the end of [[wikipedia:World War II|World War II]] that a large number of systems were built. | ||
| − | The choice of using relays instead of [[vacuum tube]] boiled down to cost and availability. Standard telephone relays were already in wide use and were considerably cheaper than any other alternative, albeit slow and power hungry. | + | The choice of using relays instead of [[vacuum tube]] boiled down to cost and availability. Standard telephone relays were already in wide use and were considerably cheaper than any other alternative, albeit slow and power hungry. Since most of the early relay computers were developed by independent individuals such as [[George Stibitz]] and [[Konrad Zuse]] and without a large budget, using relays made the most sense. |
== Relay Systems== | == Relay Systems== | ||
Revision as of 17:33, 17 December 2015
A relay computer is a computer system built primarily using relays and relay logic.
Overview
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This section requires expansion; you can help adding the missing info. |
The idea of using relays to realize logic circuits was not new even in the 1920s. However it was not until the late 1930s that actual full-scale computers and calculators were developed. However, it was not until the end of World War II that a large number of systems were built.
The choice of using relays instead of vacuum tube boiled down to cost and availability. Standard telephone relays were already in wide use and were considerably cheaper than any other alternative, albeit slow and power hungry. Since most of the early relay computers were developed by independent individuals such as George Stibitz and Konrad Zuse and without a large budget, using relays made the most sense.
Relay Systems
This list is incomplete; you can help by expanding it.
| System | Developer | Company/Institution | Relay Count | Year Complete | Notes |
|---|---|---|---|---|---|
| Model K | George Stibitz | Bell Labs | 1937 | ||
| Model I | George Stibitz | Bell Labs | 400 | 1939 | |
| Z2 | Konrad Zuse | 600 | 1939 | ||
| Z3 | Konrad Zuse | 2,000 | 1941 | ||
| Model II | Bell Labs | 440 | 1943 | ||
| Z4 | Konrad Zuse | Zuse Apparatebau | 2,500 | 1944 | |
| Model III | Bell Labs | 1,400 | 1944 | ||
| Harvard Mark I | Howard Aiken | IBM | 3,500 | 1944 | |
| Model IV | Bell Labs | 1400 | 1945 | ||
| Model V | Bell Labs | 9,000 | 1946 | ||
| Harvard Mark II | Howard Aiken | IBM | 1947 | ||
| SSEC | IBM | 21,400 | 1948 | vacuum tubes & relays hybrid | |
| Model VI | Bell Labs | 1950 | |||
| BARK | Matematikmaskinnämnden | 8,000 | 1950 | ||
| Mark I | Electrotechnical Laboratory | 1952 | |||
| Z5 | Konrad Zuse | Zuse KG | 2,500 | 1953 | |
| FACOM 100 | Fujitsu | 1954 | |||
| Z11 | Konrad Zuse | Zuse KG | 1,665 | 1955 | |
| Mark II | Electrotechnical Laboratory | 22,253 | 1955 |
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