Track down a null modem cable with female connections at either end. Hook it up to your terminal server and your target machine at the available serial ports. Then do the following.
- To see all boot messages on the serial console, issue the following command while logged in as the superuser: # echo 'console="comconsole"' >> /boot/loader.conf
- Edit /etc/ttys and change off to on and dialup to vt100 for the ttyd0 entry. Otherwise a password will not be required to connect via the serial console, resulting in a potential security hole.
- Reboot and check your results.
I followed them as written and had console through HyperTerminal. Now I just need to get a different terminal app, since I hate HyperTerminal so bad.