Question about typical RGB/Sync values when read with a DMM...

Hi all,

I picked up an untested Venture board which I'm testing out on my rig. I've
gotten the power lines hooked up OK, and I'm getting pulses on the composite
sync line, so at least *some* of the circuitry is working. For some reason,
the board pinouts are showing 12V(hi) and 12V(lo) - I'm feeding 12V to both
pins, although I wonder if that's correct. Does anyone know what the board
is really expecting on those lines? I've never seen a board that asked for
hi and lo versions of the same voltage...

I've read values with my DMM from the RGB lines and from the composite sync
line, and they look a little odd. The R,G,B lines read around 4.5-4.9 VDC,
which seems higher than other boards, even if the board were generating a
pure white screen. The pulsing sync line is reading 0.65V, which leads me to
believe that it's positive sync, not negative, so I'm thinking that I'll
have to invert it.

What would typical values be for RGB/CS when read with a DMM on a board?
Sadly, I don't have a scope, so I can't really see what the signals look
like. I don't want to just start hooking things up to my monitor if the
voltages are way out of range.

Thanks in advance for any information,

Drew

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Received on Sun Dec 30 17:03:05 2001