17 Feb
2013
17 Feb
'13
11:53 a.m.
On Tuesday (01/29/2013 at 11:30AM -0600), Chris Elmquist wrote:
Are there any recomendations for a converter that can
take RGB with
sync on GREEN as input and produce a VGA (or HDMI) output suitable for
driving a modern LCD?
I seem to be accumulating numerous older pieces of gear that produce RGB
output and space and reliability of the old tubes to which they connect
is becoming more and more premium. Would like to be able to use an
LCD as an alternative.
A couple DEC VT240 came my way this weekend and they will need some TLC to
restore but the VR240 that came along with them is in even worse shape.
I'll give it my best shot but ability to use an LCD as Plan B would
be nice.
Any recomendations from success?
Thought I would follow-up on this and give my own recommendation from
a success...
I got one of these boards,
http://www.jammaboards.com/store/cga-ega-yuv-to-vga-arcade-hd-converter-pcb…
which is intended for the arcade space-- replacing failed CRTs with LCDs.
The board does not accept RGsB input directly however, so I put a sync
separator using a TI/National LMH1980 to pull sync from green and then
fed the composite sync output from the '1980 into the GBS-8220 along
with RG&B and voila got a nice crisp display on a 1024x768 VGA LCD.
I originally tried separate H and V sync from the '1980 to the GBS-8220
but it would not properly detect this input format. When I used
composite sync from the '1980 however, it lit right up.
I used this TI eval kit for the LMH1980,
http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=snla0…
Now that the concept is proven, will probably make some dedicated PCBs
for the LMH1980 with 5V regulator and convenient connectoring/cabling
to make a more general solution.
--
Chris Elmquist