Museum of Portable Sound - The Atari 830 300-baud Acoustic Coupler (1979) was the first Atari-branded modem. It required an Atari 850 Interface Module to connect it to an Atari 400 or
Practical Peripherals 2400 baud modem | My first modem, disc… | Flickr
I found my two first modems in the shed. : r/mildlyinteresting