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Retrocomputing

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    Interesting question, but it may need a bit more qualification, as time discrete can mean multiple stings. For example varying input in discrete steps over time to create a n output series has been done - not at least to cope with slow recording (e.g.printing graphs). Also, please do not open the same question across multiple sites. For the nature of this question CS.SE, where you already asked, may be a better place anyway. Commented Jun 22 at 6:51
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    Discrete-time analog delay lines used to be common in audio and instrumentation. Delaying sound for echo effects, video decoding compensation, short time storage in oscilloscopes, such things. They aren't computers though. Commented Jun 22 at 8:49
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    WW II radar systems used delay lines for removal of reflections, etc. Does that count as computation? Commented Jun 22 at 12:13
  • @pipe - not merely 'used to be'. Analogue modular synthesizers are still a thing, with delay modules common. Commented Jun 22 at 12:16
  • Synthetic aperture radar in the early form could be one of these applications. Commented Jun 22 at 13:11