- rev 1
- rev 2
- breakout various pins
- rev 3
- larger holes for Zealio switches
- rev 4
- speaker added to C6
- rev 5
- mounting holes increased from 2.2mm to 2.85mm for Hi-Pro/EOTW cases
- rev 6
- Complete redesign, upgrade to Arm
- USB Type-C
- 2x2u support
- No in-switch LEDs
- Speaker tied to two outputs
- Many footprints for addons
- rev 6.1
- USB-C to USB-C bi-directionality fixed
- Sturdier 2u stabiliser holes
- rev 1
- rev 2
- mounting holes increased from 2.2mm to 2.85mm for Hi-Pro/EOTW cases
- rev 3
- Complete redesign, upgrade to Arm
- USB Type-C
- 2x2u support
- No in-switch LEDs
- Speaker tied to two outputs
- Many footprints for addons