What a DJ will use to control the music for a set. Huge boards with lots of buttons, sliders, knobs, and other such complexities. Despite this seemingly being isolated from EOPs, a large amount of this DJ equipment has a level of technical capability, typically running some sort of Linux variant paired with an ARM chip.

Connect a 3.3v UART to port CN1002 on the main PCB

The stock Linux install on this thing can be changed, it appears. Furthermore, it is possible to run Doom (or other programs) on it by simply acquiring root and killing rbp. More could probably be done with this.

https://twitter.com/G33KatWork/status/1146860054718509056

https://www.youtube.com/watch?v=pa5Of7wFJfQ