These telnet sessions still require the java PDP-8 interface to be running from the link on the previous page, and the PDP-8 powered on and booted. Use the help button from the java program for more information. These links will allow you to use your computers local telnet program instead of the java one I provide.
If you find the java console doesn't work well on your system you can use these:
Telnet to Main PDP-8 Console using
Telnet to second PDP-8 Console using your telnet