I upgraded to 1.6.1 because I thought that would get rid of that loud
infinite beep (btw, that core file that was made in /var/crash is 33MB;
there's noway I can send that for someone to look at).  When I rebooted,
this message came up that said

/etc/rc.conf is not configured.  Multiuser boot aborted.
Enter pathname of shell or RETURN for sh:

When I pressed enter, this came

We recommed creating a non-root account and using su(1) for root access.
No entry for terminal type "dumb";
using dumb terminal settings.

I thought /etc/rc.conf putting rc_configured=YES would work, but vi isn't
there!  When I used ed, this error comes up

ed: /tmp/ed.00020a: Read-only file system.

I can't even copy my old rc.conf file in /etc.old into /etc because it
keeps saying my file system is read only.  Do I have to reinstall NetBSD
from scratch?
By the way, for some reason, the loud sharp beep sound that comes up when
I try to go past end of file is now a soft beep that doesn't make me jump.
Yasir