18 Jul
2012
18 Jul
'12
1:44 p.m.
It depends on the monitor. You need to be able to
control the gain and
offset (black level) of each colour to get both the highlights and
lowlights a neutral grey. Some monitors, particularly the better ones,
have 6 presets for this In other cases, one of the presets is not there,
in that you can get the right effect using the 5 you do have.
And this is a no go because that monitor is KVMed to several other systems,
not just the Indy.
In this case, I was able to find a circuit that will separate sync off
the green line into H/V sync, so this should suffice. SI87.com sells them
as well.
Be casreful. Most such circuits (based on the LM1881 or improved versions
thereof) simply extract the sync signals from the Sync-on-green composite
signal, but leave the signal unchaged to be fed to the green input of the
monitor. They do not clip off the sync signals and thus leave a green
video signal where the most -ve value is the black level. If that's the
case with the circuit you are using, it will nto make much (if any)
difference.
-tony