Hello, 

I have a spare HP 98774B greyscale monitor (19", 1280x1024 with 72Hz).

Is it possible to use it with an HP433S system running NetBSD-hp300 1.2 
and X11R5?

This is what the kernel says about the graphics card:
grf0 at scode133: 1280 x 1024 256 color hi-res catseye display (console)

But, the multisync monitor currently connected to the system says the
refresh rate is only 60Hz. How to increase it?

Regards (and happy Holidays),

--
Ville Warsta
vwarsta@cc.hut.fi