A ZX81 keyboard connected to a breadboarded Teensy microcontroller, with a small OLED displaying "F" https://digipres.club/system/media_attachments/files/111/819/106/115/567/575/original/7a18e4864a69008c.png
okay I implemented switching between all the modes. I'm gonna take a break now, but the next step will be implementing ALL these fucking keyboard functions.