Sync on Green RGB video
dj.taylor4 at comcast.net
Sat Nov 18 21:57:47 CST 2017
On 11/18/2017 6:44 PM, william degnan wrote:
> On Nov 18, 2017 4:09 PM, "Douglas Taylor via cctech"
> <cctech at classiccmp.org <mailto:cctech at classiccmp.org>> wrote:
> > I have a couple of vaxes that output 'unique' video, Alpha 3000 300,
> Alpha 3000 400, Vax 4000 VLC, and Vax Station 3100 M76.
> > The Alpha and VLC each have a 3W3 type of connector and the 3100 has
> a 15 pin DEC designed connector.
> > What does it take to connect these to inexpensive, modern VGA light
> weight monitors?
> > Doug
> I have played around with that problem. If you have a converter to
> get into a VGA port a newer high-end vga display will be able to
> adjust, but not a cheap one. Because I use my vice vga/digital
> display for mode stuff, I use a huge SGI color display for all of my
> 3w3 outputting systems and I just switch the cable around. If you
> could imagine 5 or 6 systems clustered around the one display.
> I am sure someone here has a technical explanation, but in a nutshell
> the 3W3 world signal isn't the same as a standard vga and cheap vga
> displays can't handle the refresh rate. Someone will prob. refine my
> answer but that's why you can't just stick an adapter on there.
> Bill Degnan
> twitter: billdeg
> vintagecomputer.net <http://vintagecomputer.net>
I ran into a similar comment somewhere on the internet somewhere (it's a
big place) that you had to make sure that the LCD monitor supported the
H,V rates put out by the DEC video frame buffer.
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