A fan mounted to the chassis inside the Macintosh Plus.

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   retrotechtive (retrotechtive@retrochat.online)'s status on Friday, 01-Dec-2023 03:37:21 JST retrotechtive

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   As soon as I turned it on, I could hear this.

   This looks like part of a very professional mod. I removed the power cable, but saw the fan cable seemed to be trailing off elsewhere...