I had one of those when I was in high school. It was
a Terminet 300 and
didn't have any keyboard attached to it. Right after I got it (in trade
for a wrecked R/C helicopter of all things), I loaned it to a friend that
discovered the hard way that Form Feed _really_ meant Feed All 2500 Sheets
of Paper Out of The Box And On To The Floor. He wasn't amused. :)
There was a little cardboard disk at the rear left side, belt-driven from
the platten. Notches in the edge of the disk (and, IIRC, the belt ratio)
determined the form length. I guess if this was malfunctioning, or the
disk was missing, or... then it would feed the entire box of paper...
-tony