this post was submitted on 27 Jun 2023
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It was a Radio Shack 300 baud modem. A little googling seems to indicate is would likely have been a Tandy DCM-3 “Direct Connect” (as opposed to acoustic coupler) modem.
It was in-line between the wall and a phone so you would pick up the phone, dial the number, head the modem tone, press a red button on the top of the modem and hang up the phone.