Enter this command to enable the port, From the terminal, enter your login name and pa, From the terminal, move around the system and o – Comtrol SCO OpenServer User Manual
Page 20: When you are finished, type exit and log out

20
Terminal Sessions in SCO OpenServer
SCO OpenServer
4.
Enter this command to enable the port:
enable ttyr0a
The system should respond with:
/etc/inittab updated
/etc/conf/init.d/rckt updated
5.
From the terminal, enter your login name and password. If you
cannot log in, check the baud rate setting on the terminal and
verify that it matches the baud rate setting on the server port.
To see the current settings for the port, enter this command on the
system console:
stty -a < /dev/ttyr0a
6.
From the terminal, move around the system and open files to
verify that everything is working correctly. Access the custom
utility to verify that the system is interpreting ASCII control
sequences correctly.
7.
When you are finished, type exit and log out.