NCR Tower 32/500- lost root password

I've got a NCR Tower 32/500 (3466-500) running Unix that has a mixed-up root password- see, I got it in working condition, with no password on root. Like a dolt, I changed the password before setting up an account for myself. It happily took the password, and I did an orderly shutdown. Later, I re-started and went to log in, and it kept coming up with 'login incorrect'. I did a disorderly shutdown (no way to log in to do it right) and now it comes up in single-user mode saying it needs to be fsck'ed (no problem), but it still wants a password. I've tried every convolution of the password I used (it was a simple word, a numeral, and the # sign) with no luck. I do not know any other accounts/passwords, nor do I have a system install tape. Is there any way to get in without a password and edit the /etc/.passwd file? Richard