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Mechanical and many electronic analog computers saved their output data as pen plots on paper.

Some high speed electronic analog computers could read/write data as waveforms on multichannel wide magnetic tape (similar to the master recording tapes used in music studios). Such analog computers were sometimes used as controllers and data collection devices on wind tunnels or in industrial process control before digital computers became affordable and reliable enough. These special tapes could be played back later off line at slow speed if pen plots on paper were desired.

Other high speed electronic analog computers drew their output on CRTs which were then photographed to save it.

There are other ways too.

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Q: Can early analog computer save data?
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