8 Feb
2001
8 Feb
'01
6:49 a.m.
I've yet to find any docs on how to seperate out
the sync-on-green. I
have an HP X term that outputs sync-on-green VGA and no compatible monitor.
Its trivial these days, think of it as RS-170 composite video on the green
channel. National used to make a great little 8 pin DIP part that with a
few passive components would take composite video in and output separate
sync and video. Search for 'sync separator' on the web or in the library.
One trick I saw (but never figured out if it was actually necessary) was
that the sync was separated but the original video was used to the green
gun. The author claimed that the phase shift introduced in going through
the sync separator caused the colors to be 'off' on his monitor so he just
fed the original signal back into the monitor.
--Chuck