https://sites.google.com/site/tandycocoloco/wordpak-rs http://www.colorcomputerarchive.com/coco/Documents/Manuals/Hardware/Wordpak%20Users%20Manual%20(PBJ%20Inc).pdf
http://users.axess.com/twilight/sock/rs232.html http://www.cocopedia.com/wiki/index.php/Deluxe_RS232_Pak