When using Telnet to enter super user mode on the LaserWriter Pro 810, you must change the carrige return configuration from CR-LF to CR-NUL. Here is how to make this change.
1. Launch NCSA Telnet
2. Choose Preferences from the Edit menu, and choose Sessions from the submenu.
3. Click New to create a session, or highlight the session you normally use and Click Change.
4. Select Berkley 4.3 CR mode. (This changes the carriage return mode to CR-NUL.)
5. Select OK to close the Sessions options dialog.
6. Select OK to close the Sessions dialog.
Once you have changed the CR mode, you can enter the super user mode.
The password to enter the super user mode is: SYSTEM