IBM rebadged and resold the HP 7470 and 7475
plotters. That's
I thought htere were minor mechancial differneces too, it
wasn't a simple
rebadging. IIRC when loading paper into the hP one, you have
to line the
edge up with a mark on the plotter. With the IBM one, there;'s little
plastic stop that's raised when you flip the load lever, you
just put the
paper against that.
Early HP plotters have the strip. Later ones don't...