Hello, Computer: Just what was that computer Star Trek's Gene Roddenberry used?

His vision of the future inspired legions of engineers, nerds and techies as well as Bluetooth headsets, the iPad, Siri and cell phones.
But what kind of techie was the late Star Trek creator Gene Roddenberry in real life? Or more specifically, what kind of computer did the man use? 
These questions all bubbled up when Gene Roddenberry’s long-lost floppy disks surfaced. The disks, all artifacts in themselves, were salvaged, but information on the actual computer he used to creat