As masochistic as this may look, handwired projects are still great for prototyping and they deserve to be regularly featured here on KBD.news.
[…]the worst part is not soldering the diodes themselves. It's because I have to use enameled wires to be able to cram everything under there. The worst part was soldering those wires to the switch legs. I swear those wires are solderphobic. It just won't stick to the wire. And because it's hard to see if you actually burned through the coating or not, I had to check the connection with multimeter after every wire.
There are two completely different keyboard matrices referred to as duplex matrix. Let's examine the Japanese one, which makes possible to handle 160-200 keys with a single Pro Micro.