http://www.ebay.com/itm/Multi-Coin-Acceptor-CH-924-USB-time-control-PCB-kiosk-/250795593505
http://www.waferstar.com/en/EU1-Coin-Acceptor.html http://www.waferstar.com/en/EU2-Coin-Acceptor.html SERIAL! RS232 output
http://www.jcmglobal.biz/en/products/productdetails.aspx?ProdID=EBA-32-34-SD3
http://www.casino-software.de/
http://www.hobbytronics.co.uk/raspberry-pi-serial-port
https://logicethos.com/blog/raspberry-pi-touch-screen-lcd/#!prettyPhoto
http://www.berryterminal.com/doku.php/berryboot
https://projects.drogon.net/raspberry-pi/wiringpi/
http://www.raspberrypi.org/phpBB3/viewtopic.php?f=63&t=25118&p=231345
