11 Oct
2013
11 Oct
'13
1:24 p.m.
In article <20131009145643.GB7248 at n0jcf.net>,
Chris Elmquist <chrise at pobox.com> writes:
The colour video output from the VT240 unit (VS240) is analogue RGB with
sync-on-green. The VR241 monitor has a switch to select between separate
sync and sync-on-green -- from memory it simply swithces the input of
the sync separate between the seprate sync input and the green video input.
Anyway, I think the board refered to is a sync separator. Anything
designed to conenct ot a PC video output (like the first device mentioned
above) is likely to need separate syncs
BUT...
Having followed the second URL above, it appears that evaluation board is
not cheap. A TV-rate sync separator is pretty easy to make usign the
LM1881 or its successors. Personally,. I'd jsut buy the chip and wire up
the few passive components needed. It woudl take a few minutes at most.
-tony
If the VR241 is a loss, I have successfully
adapted a modern VGA LCD to
a VT240 terminal using a simple sync seperator circuit ahead of a scan
converter board intended for arcade game restoration.
You need one of these,
http://www.jammaboards.com/store/cga-ega-yuv-to-vga-arcade-hd-converter-pcb…
bs-8220-gbs-8220.html
and one of these,
http://www.ti.com/tool/lmh1980mmeval
Why do you need the latter?