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The Traffic Service Position System (TSPS) … The Traffic Service Position System (TSPS) was developed by Bell Labs in Columbus, Ohio to replace traditional cord switchboards. The first TSPS was deployed in 1969 and used the Stored Program Control-1A CPU, "Piggyback" twistor memory (a proprietary technology developed by Bell Labs similar to core memory) and Insulated Gate Field Effect Transistor solid state memory devices similar to dynamic random access memory.s similar to dynamic random access memory.
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, https://telephoneworld.org/pay-telephones/acts-automated-coin-toll-service/ +
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Audible tone which alerts TSPS operator of a new call. 440 Hz 5 ms.
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Zip tone.ogg
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Zip tone
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| rdfs:comment |
The Traffic Service Position System (TSPS) … The Traffic Service Position System (TSPS) was developed by Bell Labs in Columbus, Ohio to replace traditional cord switchboards. The first TSPS was deployed in 1969 and used the Stored Program Control-1A CPU, "Piggyback" twistor memory (a proprietary technology developed by Bell Labs similar to core memory) and Insulated Gate Field Effect Transistor solid state memory devices similar to dynamic random access memory.s similar to dynamic random access memory.
|
| rdfs:label |
Traffic Service Position System
|
