> Back in the day I got to go to a demo and presentation about the machine. > > An interesting thing about the design was that it had a 5” screen, but it could only show about 50 columns at a time of the 80 column display. There was a knob you turned to pan the display.

On mine it's keyboard ctl-left/right arrow. Paint is worn off the metal surround as a result. I don't recall a knob.