Just found on Lulu.com: Building a Better Mouse by Steve Alcorn and David Green.

According to Wikipedia: Steve Alcorn joined Walt Disney Imagineering as a consultant, where he worked on the electronic systems for Epcot Center. During his two years with Imagineering he designed show control systems for The American Adventure, wrote the operating system used in the parkwide monitoring system, and became Imagineering’s first Systems Engineer, heading up mechanical, electronic and software systems for the Journey Into Imagination ride.

Not sure what this is worth but I have just ordered it and will find out in a few weeks.