I recently got hold of an old DEC VR290-AD 19" color monitor
which I would like to use as a display for Xwindows. The
monitor is of a fixed frequency type, resolution 1024x864,
horizontal scan 54kHz and vertical refresh rate 60Hz.
Furthermore, the fixed frequency monitor uses RGB signals
with a composite sync on green, which is incompatible with
a standard PC VGA adapter.
To connect the monitor to a PC I have:
(1) combined the two sync signals (with a handful of ICs)
and superimposed the sync signal on the Green video signal.
The circuit enables the DEC monitor to sync on the video.
(2) set up the Xserver to provide the correct horizontal
and vertical sync (at least I think :-/ )
Modeline "1024x846" 66 1024 1088 1168 1248 864 868 872 880
All this will give me a stable picture, but it looks like
the sync pulse occurs at the wrong time.
The picture I am getting shows the Xdesktop starting somewhere
in the middle of the screen, leaving the right side, and then
re-appearing on the left.
Has anyone succesfully connected this monitor to a PC? If
so, how? It would be a shame to let this (once) expensive monitor
go to waste.
Kind regards, Ivo