There's been a load of these printers from military surplus on E. Bay recently. But they've come from a (classified?) military communication system and have pretty much no documentation at all. This is my attempt at getting it printing something. Hopefully with enough info for you to be able to use them with much less effort.
This is the only information I've found on the internet:
(I'm not sure where I've found these keywords... but they might help with Googling)
There was a promise of a datasheet at the above address but after they got me to create an account (probably just a way to obtain my E. mail address for spamming), The promised datasheet link just takes you to Panasonic's website.