RGB to VGA converter, your posting at classiccmp.org/pipermail/cctech/2005-March/041987.html
Eric J Korpela
korpela at ssl.berkeley.edu
Fri Jun 20 12:56:28 CDT 2008
The sync separator portion of the board is at
http://setiathome.berkeley.edu/~korpela/sync_separator.png, and it's
unforunately the only portion I have on this machine.
Sorry for the large size. So I think the drill is connect R directly to
H/C, although its possible the some initial conditioning (an inverter or
comparator) was required. It's been a while since I thought a lot about
that board. If I were to do it today I might switch to an LMH1980, which
supports more input formats.
ePanorama.net is a good source for a lot of video circuits.
On Fri, Jun 20, 2008 at 10:29 AM, Eric J Korpela <korpela at ssl.berkeley.edu>
> I have used it to convert "sync on green" RGB at NTSC rates to a separate
> sync for input to a scan doubler (such as the "CGA to VGA" board previously
> discussed. Although I don't have the circuit in front of me, I think it was
> as simple as using G as the "composite" input to the LM1881.)
> On Thu, Jun 19, 2008 at 3:56 AM, gii dii <giidii at gmail.com> wrote:
>> would your circuit work for RGsB to VGA, 1280x1024 resolution,
>> to connect an old digital workstation to a TFT?
>> thank you!
>> best regards
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