Apple knowledge base article number 2238 titled
 "Macintosh: How to reset PRAM and NVRAM" may be of use to you.

The following URL may index it:
  http://docs.info.apple.com/article.html?artnum=2238

Darrin

Mark Hofhuis <markh@mpg.nl> writes:

> Hi there,
> 
> I tried installing netbsd on my G3 blue and white, but things went horribly
> wrong.
> 
> How do I set back my open firmware so my mac boots in OS9 again???
> 
> thanks!!!
> 
> Mark