DEC VAX/VXT2000 and monitors

From: Peter C. Wallace <>
Date: Sat Feb 1 11:40:01 2003

On Sat, 1 Feb 2003, Fred N. van Kempen wrote:

> Hi all,
> Trying to clean up the "inbound" queue of systems-to-check-and-fix, and here's a few boxes I
> cant seem to figure out. Heeeelp ! ;-)
> Basically, the monitor madness I guess.
> I have:
> - various VAXstation 3100-family systems with mono, GPX and SPX cards
> - various VXT2000 boxes with their SPX card
> - a VXT2000+ box with "SPX PLUS" card
> and, two monitors (only.. gave the rest away long time ago.), a VR19-D3 (seems to be a
> generic GDM1960 - it also has the HI-LO switch on the back) and a VRT320.
> The VRT320 is the one that actually seems to work on all the GPX cards, and on the SPX
> cards in the VXT2000's. It does NOT sync with the SPX cards in the -M38 and -M76's, and
> neither for the SPX PLUS card in the VXT2000+.
> Obviously, I would want the -M38 and -M76's SPX cards to be used, and the
> SPX PLUS in the VXT2000+. No specs on the latter can be found, though,
> although I did notice that there is a 74.3MHz xtal on it, rather than the
> 69.9 one on the regular card, so it might be doing the 1280x1024_at_74 rather
> than _at_70.
> Does anyone have info on this?
> Cheers,
> Fred

69 MHz pixel clock is for GPX resolution and refresh rate (1024x 864 x 60 Hz
refresh) 74 is only a little faster not sure what monitor that works with

SPX normally does 1024x1280 at 66 Hz (VR19 lo range ) uses a ~119 MHz pixel

The SPX cards can be switched from GPX (1024x864 60 Hz refresh) to SPX
resolutions (1280x1024 66 Hz refresh) see:

Its funny that your VRT320 works with GPX because I have a few of those and
they work and the SPX rates only... The VR19 should work with the SPX cards if
they are set in SPX mode...

Peter Wallace
Received on Sat Feb 01 2003 - 11:40:01 GMT

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