The matrix is electrically 1x12 with no diodes, with a thirteenth pin used for the column rather than a ground in order to be compatible with all the listed microcontrollers..
The default keymap is a testing keymap that is intended to make sure all of the keys on the matrix are working and properly assigned.
[The original (minimal arduino sketch) firmware, with support for some unsupported controllers](https://git.40percent.club/di0ib/Misc/src/branch/master/polyandry)
Keyboard Maintainer: QMK Community
Hardware Supported: Polyandry PCB
Hardware Availability: [Polyandry gerbers are on 40percent.club](https://www.40percent.club/2019/07/polyandry.html)
Make example for this keyboard (after setting up your build environment):
See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).