If you have a SWTPC PR-40 that you would consider selling or offering in trade, please contact Tom Owad at firstname.lastname@example.org. Thank you!
SWTP PR-40 Printer Interface Schematics
The above was the most commonly used schematic for connecting a printer. It allowed the user to switch between two outputs: to the video monitor, and to both the video monitor and the printer.
The below schematics functions as the prevous one, but adds a third switch setting for printing without sending output to the video monitor. This increased the data output speed to the printer.