Several things:
> NetBSD 1.4L (NEWUBA) #527: Tue Oct 26 20:45:16 CEST 1999

Pretty old kernel, -current is 1.4Y, I use 1.4X on my M76

> primary cache status: 21a<DPERR,HIT,REFRESH,ENABLE>
> secondary cache status: ffe1<TPE,DPE,MISS,ENABLE>
> total memory = 32508 KB
> memory error!
> primary cache status: 21a<DPERR,HIT,REFRESH,ENABLE>
> secondary cache status: ffe1<TPE,DPE,MISS,ENABLE>
> avail memory = 27492 KB

This looks very scary. Perhaps your memory has become unseated? Try
re-seating the SIMMs (open the box, remove and replace them). Or have
you recently tried to add memory? 

--Chuck