Before reading about it on your web page, I'd totally forgotten that you'd written Empire in 1972, on an HP2000 no less, which you were famous for long before your seminal Eddie and Eedie Usenix paper!
I heard the HP2000 had a command to rewind the tape drive, but you could also use it to rewind the disk drive! But it crashed the whole system. I always wondered if that was from a sudden release of kinetic energy, sparks, smoke, and flames, or if the device driver just crashed.
Walter Bright, who made the 1977 version of Empire, hang out here on Hacker News, too. Are you guys old friends or mortal enemies? ;)