After looking at the System Programmer's Manual (I have a printed copy)
i.e. ftp://ftp.netbsd.org/pub/NetBSD/misc/dec-docs/ek-d3sys-pm.ps.gz

It looks like the 3000/300 series have integrated graphics adapters,
but they have just one oscillator for setting the resolution.

What you may have been seeing is related to either the 3000/500 or
more generally TC graphics adapters like the PMAGB-B which has two
oscillators and a jumper selecting 1024x768 or 1280x1024...

Cheers,

-- Ken

Hyung-song Nam wrote:
> 
> That's true--but my google search showed me some page that claimed i
> can change that fixed resolution by adding a crystal.. i.e., change
> 1280x1024@xxHz to 1024x768@xxHz. Has anbody tried this, have more