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Close-up of the right half of the Ergodox keyboard. The Teensy microcontroller, the mini-USB connector, and the four wire 3.5mm audio connector used to connect the other half of the keyboard.

Image images/ergodox/20140726.0112.GO.CanonSX150.web.jpg, size 117286 b
Image #20140726.0112.GO.CanonSX150
Photo © 2014, Giles Orr

https://gilesorr.com/misc/keyboards/Ergodox.20140726.0112.GO.CanonSX150.html 
by giles