maybe this helps:
Question: I'm looking for the optional printer kit for a
Williams/Bally pinball, but am having a hard time finding
one. Can Uncle Willy help?
Answer: Have your local distributor order a "PRINTER OPTION KIT",
part number 63110 from WMS Part Sales. This kit comes
complete with cables and instructions.
The Printer Option can be installed in any Williams/Bally
game, starting from Funhouse. The Printer circuit board
mounts in the backbox on the studs above the CPU circuit
board. In games with a Fliptronics circuit board (Addams
Family and later), the Printer board mounts in front of the
Fliptronics board with standoffs.
Cables are run from the backbox into the cabinet to connect
to a small interface board. The interface board should be
mounted in the cabinet where it will be easily accessable
from the coin door. Uncle Willy likes to mount the
interface board just to the right of the coin door on the
inside front of the cabinet.
best place to find one is on ebay......