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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. 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. 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. It's for those exact reasons that the earliest digital computers went with relays. |
== Relay Systems== | == Relay Systems== |