11 Oct
2013
11 Oct
'13
5:58 a.m.
On Thursday (10/10/2013 at 03:43PM -0600), Richard wrote:
In article <20131009145643.GB7248 at n0jcf.net>,
Chris Elmquist <chrise at pobox.com> writes:
Because the Jammaboard only accepts specific H and V sync configurations
depending on scan rate. We want what it thinks is CGA mode and in that
mode it will only accept seperate H and V sync. The VT240 generates
SYNC ON GREEN and so I use the lmh1980 to extract all syncs from the
green and provide them on seperate wires going into the Jamma board.
Chris
--
Chris Elmquist
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?