Hello,
I would like to introduce the DIY Chess Computer "Mysticum" to you; it is a non-commercial project, which was developed by Guido Marquardt.
Do you play chess and you don't like to play always on the computer screen against chess engines but on a "real chess board" with "real chess pieces"??
With the help of this board you can download the technical documentation including the assembly manual. In the dropbox you can find the software. Here you can find a description of Mysticum including an instruction manual. Sorry, all documentation is written in German, but in the board you can post in English and you'll get an English answer.
Regards,
Michael