I'm working on a project to try and get RGB from as many of my classic consoles as possible. I've started with a Sega Mark III since it seemed like an easy cable to make, and my SMS and Gen 1 are in storage. The cable works great for SG-1000 games (huge improvement in clarity and color), but Mark 3/SMS games are missing colors. When I use composite it looks fine. I've tried looking online for information, but the majority seems to be related to the Gen 1, since its a far more common system.
My setup is as follows:
Sega Mark III -> Custom Built RGB cable (using pinouts from http://dempa.jp/rgb/heaven/g_mk3.html (http://dempa.jp/rgb/heaven/g_mk3.html)) -> Extron System 4 LDxi -> Samsung 2333HD Monitor
Any thoughts? I'll grab my Gen 1 maybe later today to test it out. Since I've already got the connectors, I'll be working on an MSX2 and a Super Cassette Vision as well.
Here are some screenshots:
Star Force (SG-1000) RGB
(http://img31.imageshack.us/img31/227/starforcergb.jpg)
Space Harrier (Mark II) RGB
(http://img197.imageshack.us/img197/2048/spaceharrierrgb1.jpg)
(http://img43.imageshack.us/img43/2796/spaceharrierrgb2.jpg)
Star Force (SG-1000) Composite
(http://img31.imageshack.us/img31/2396/starforcecomposite.jpg)
Space Harrier (Mark III) Composite
(http://img27.imageshack.us/img27/8629/spaceharriercomposite1.jpg)
(http://img707.imageshack.us/img707/6905/spaceharriercomposite2.jpg)
Place a 75 ohm resistor and 220µF capacitor in series with each video line.
http://members.optusnet.com.au/eviltim/gamescart/gamescart.htm#megamstr (http://members.optusnet.com.au/eviltim/gamescart/gamescart.htm#megamstr)