RGB to VGA converter, your posting at classiccmp.org/pipermail/cctech/2005-March/041987.html

[Eric J Korpela]

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.

Eric

On Fri, Jun 20, 2008 at 10:29 AM, Eric J Korpela <korpela at ssl.berkeley.edu>
wrote:

>
> 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:
>
>> Hello,
>>
>> would your circuit work for RGsB to VGA, 1280x1024 resolution,
>> to connect an old digital workstation to a TFT?
>>
>> thank you!
>>
>> best regards
>> Gunter
>>
>
>