Thanks to Coyote for sharing informations about the WPC printer

Here some tips, if you're looking for more generics infos about printers used in pinballs (not tickets dispensers !).

For the alpha-numeric/DOT generations, a kit was indeed produced in january 1993, by WILLIAMS for WPC games. This kit had the reference 16-9464 :
2018-06-01_15h59_22 (resized).png

But this was not the first time a printer was used for pinball. Many years before, in 1980, ZACCARIA implement a printer interface in their pinballs. It used a specific connector (CN10 - interface connector) on their 1B1110 CPU board. The serial interface was directly connected to the input/output lines of the Signetics 2650 microprocessor. I have never see this printer, but it is clearly mentionned on the schematics :
2018-06-01_15h56_40 (resized).png

But may be, the first printer was implemented by GOTTLIEB a few years before, in their SYSTEM 80.
I don't have a picture of this one, but I've seen one, many years ago on eBay. The printer had no dedicated connector. It used some wires on the switch matrix and was used in conjunction with the bench test fixture. This "serial" printer was very similar to the one used on AIM-65 (built in 1978 by Rockwell). This was a narrow thermal printer. The datas printed were the same as thoses displayed in the bookskeeping/test menu.
For fun, we had made a LCD-device that simulate this printer : https://www.flipprojets.fr/Printer80_EN.php
Note that, this printer only exist for SYSTEM-80. Later, on SYSTEM-80A this function had been removed.