Apple Newton Press (for Windows) - Manual (Page 16)

3 Plug the other end of the cable into the Newton PDA’s communication port.
That’s it! You can go on to “Installing Newton Press,” next.
IMPORTANT You can use the Newton Press application to create and format
books on your computer without connecting a Newton PDA to your
computer. To install a book package on a Newton PDA, however, you must
connect it. To complete the installation procedure given here and to test
whether Newton Press is installed correctly, be sure to follow the connection
instructions given next.
Serial ports
Newton PDA
communication port
Serial cable
4 Chapter 1