However, if you have an old amiga monitor on your test bench (like i do) then you can just run the video straight into its composite video input. No board hacking neccesary. These monitors are great, with RGB input on the back, and composite RCA phono jacks on the back, with a mode switch on the front. I modified my jamma test rig pinout to include a composite video input on the end of the jamma connector, so i can hook up my b/w games to my regular jamma connector, flip the mode switch and et voila i'm in b/w mode.
Okay, this is something that is very interesting to talk about because I have built a few monitor hook ups and have yet to find the "ideal" solution. I currently run a 13" monitor off my bench that has a few simple switches to switch into composite mode. It can only handle negative sync right now, so it I have to run a bypass when I'm running Williams Defender type of games. And if I recall correctly, Mortal Kombat boards (usually I am just testing them) are special too. My notes aren't in front of me... so it's fuzzy. (I seem to remember having to run each H and V sync line separately for MK.) What do you do when you have positive sync? Or does the Amiga monitor have a mode for that? Not being familiar with the Amiga monitors, are you talking about the 1080, 1084 monitors? Or something else. I'd keep my eyes open for one to try out. There is a flea market near here and chances are I could get something pretty cheap. (Come to think of it... I believe I have an old Apple II mono monitor lying around. That'd probably work for this Pong.) --James Bright www.QuarterArcade.com Restored Arcade Games for your Home