Yep, we old-timers often wrote bitmaps to dot-matrix printers. Fortunately most dot-matrix machines had a pseudo-standard interface usually called Epson compatibility (does Epson even exist now? - they were the KINGS of printers for a long time...). One could as jepri says print a bitmap with a little effort. Naturally you must decode the graphic file format first, then map the colour info to B&W, but that's old hat. If you can't find manuals on dot-matrix printers on the net, I'm sure to have a few exmples in my, uh, collection.

I should also mention that the later 24-pin printers had quite a decent resolution, and IIRC early Ghostscript could do decent postscript on them too. Of course if you want the output the same day, that's where a real postscript printer comes in!