# Mach 3 A 3x3 macropad with RGB underglow. Note: It sets an output pin to high, which is the alimentation of the backlight circuit. * Keyboard Maintainer: [etiennelepagel](https://github.com/etiennelepagel) * Hardware Supported: Mach 3 from Mach Keyboards * Hardware Availability: [Mach Keyboards Official Website](https://machkeyboards.com/) ## Bootloader Enter the bootloader in 3 ways: * **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard * **Physical reset button**: Briefly press the button on the back of the PCB * **Keycode in layout**: Press the key mapped to `RESET` if it is available Make example for this keyboard (after setting up your build environment): make machkeyboards/mach3:default 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).