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
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
What does it take to connect these to inexpensive, modern VGA light
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.
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.