Keio specialises in gaming hardware, as well as other digital electronics. All designs are open source.

Retro Adapter: Connect almost any joystick, gamepad or controller to USB for use with a PC, Mac or Playstation 3. The list of supported devices is long and includes most "retro" systems from Atari, Commodore, Sega, Nintendo and more.

Console Converters: Connect a Sega Saturn or SNES gamepad to a Playstation 2, Playstation 3* or XBOX 360*, Neo Geo or Supergun. Perfect for serious gamers thanks to zero lag and a wide variety of button button mappings tailored for specific games.

* With a suitable adapter.

SUPERPLAY: Currently in development the SUPERPLAY is a controller PCB for building the ultimate custom arcade stick. Compatible with all major and many minor systems both new and old, with advanced features and high performance.

My name is Paul, aka MoJo. I started doing electronics as a hobby, with a focus on gaming. Now that I have several products available I thought it would be a good idea to create a brand for them, and thus Keiō was born.

Thinking of a good name these days is hard. Finding one with an avilable domain name is even harder. Eventually I picked Keio because I liked the sound (京王, pronounced "kay-oh") and I travel on the Keio-sen railway a lot. Denshikougaku (電子工学) means "electronics" in Japanese.