Posted by cityfly on 19, 2001 at 7:15 PM:
In Reply to: I don't think so. posted by scotto on 19, 2001 at 3:46 PM:
: I have the same card and have done some investigation of this idea. Specifically, I wanted to be able to display TV to my arcade monitor, which is probably what you're after.
: I don't really understand what it is that you're trying to accomplish with that circuit, but it seems to me the problem is a fairly basic one: Can a composite video signal be converted to RGB?
: The answer seems to be yes and no. I understand that there are some (stupidly expensive )converters available. Old Space Ace and Dragon's Lair video games made use of these, I believe. But in terms of a hackable solution, I have yet to find one. And I've done some digging.
: Sorry, buddy. If you find a solution, though, I'd love to hear about it.
the rgb signal comes from the vga port like in pc2jamma, the circuit just takes the composite video and outputs composite sync compatible with a tv/arcade monitor(15.7xxx k)
from the F.A.Q
http://www.arcadecontrols.com/arcade_monitors.shtml#Sync
Arcade monitors use rgb and composit sync. They run at the same frequency as a normal television.
saint's note: I had formerly commented I thought this was incorrect. Since then, a former tv/monitor tech named Don wrote me to say that this is in fact correct.
"A normal TV DOES have the same horizontal frequency as an RGB monitor out of our classic machines. It is 15.7xxx where as a VGA monitor is about 31k. Basically those RGB monitors are regular TV parts for the most part."