Just a hunch - I bet a lot of the printers from the 80s (eg the TRS-80 one) speak plain ASCII over a standard parallel port, with CHR(10), CHR(11) and CHR(13) f

Just a hunch - I bet a lot of the printers from the 80s (eg the TRS-80 one) speak plain ASCII over a standard parallel port, with CHR(10), CHR(11) and CHR(13) for line feed, page feed and carriage return. (Although I'm guessing, so check before you buy!)