An Avitech Rainier multiviewer, seen from behind. Ooo-err!
https://digipres.club/system/media_attachments/files/113/783/082/978/801/238/original/4a69b0d9d3fd8862.png
This is what lurks under the Eldrich horror of cabling. A pair of fairly boring grey boxes with a pretty nice front panel.
They talk to each other over a standard RJ45 straight cable strung between the RS485 ports, and the video is chained with a normal DVI-I monitor cable.
Aside from broadcasting, these were also popular for shop CCTV systems - those would have had a composite output, connected to a VCR. These days you'd use a digital video recorder.
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