Clavier Clavier (French for ‘keyboard’) is an FPGA-based mechanical keyboard with an integrated USB hub, and numerous communication interfaces (JTAG, SPI, I²C, UART). Features Full size 105 keys ISO keyboard + one extra Compatible with PCB mounted Cherry MX switches N-key rollover 1000 Hz polling rate No multiplexing, no ghosting 2-port USB 2.0 hub JTAG, SPI, I²C, 2 × UART, and 8 × GPIOs FPGA-based, VHDL only, no ALU Fully open-source, including all design tools (see below) What's the extra key ...