I've got one
I've got one in my retro collection. Classic computer, and great for running CP/M stuff.
"There was also support for other printers, using the optional and rare RS232 serial interface."
I've got two of these. They also have Centronics. I've used the serial interface to send software from a PC using Kermit. Lot's of CP/M stuff is archived on the 'net. You need to set the terminal/console as VT52, and the printer emulates the Epson FX-80.