The present invention is a method and apparatus enabling a low cost hardware upgrade path and low cost processor board retrofit for gaming machines. The enabling features include a two-board set made up of an industry standard form factor processor board (a single board system, able to support an operating...http://www.google.com.hk/patents/US7351151?utm_source=gb-gplus-share專利 US7351151 - Gaming board set and gaming kernel for game cabinets
