Subject: Re: PMAGB-B out of sync
To: Simon Burge <>
From: Michael L. Hitch <>
List: port-pmax
Date: 09/21/1999 19:44:10
On Wed, 22 Sep 1999, Simon Burge wrote:

> Jared Smolens wrote:
> > I recently came across a DECstation 5000/260 with a PMAGB-B framebuffer.
> >  Since this machine is a whole lot faster than my 3100, I'd like to
> > upgrade. It seems as if there's a problem syncing with my monitor.  When
> > doing the framebuffer tests, everything is extrememly squiggly and when
> > the boot prompt comes up, it's spread all over the screen, of course. 
> > The monitor is a DEC VR 160-DA, something like 14 or 15" screen and it
> > works fine with the 3100.  
> The problem here is that the 3100 does 1024x864 and the PMAGB-B does
> 1280x1024.

  The PMAGB-B can do 1024x864 with the appropriate crystal (I don't recall
what frequency is required at the moment).

> To use the same monitor on the 5000/260, you'll need either a PMAG-B or
> a crystal to put in the spare socket of the PMAGB-B to drive it at the
> lower resolution (the the Out=osc0 jumper will do something useful).
> The crystal you need is a 69.1968MHz one.
> I'm not 100% sure if Xpmax (the X server) supports a PMAGB-B running at
> the lower resolution - anyone?

  It's supposed to - the sfb driver now gets the resolution from the card.


Michael L. Hitch
Computer Consultant
Information Technology Center
Montana State University	Bozeman, MT	USA