How do you make a Sync combiner for cheap? I want to use my old Windows 98/MS-DOS 6.22 rig and my Dreamcast via RGB SCART, but in higher resolutions. How do you combine the H-Sync and V-Sync signals into one C-Sync signal? Can someone give me a parts list and instructions? I've been having trouble find good info with a parts list online. I know there are Sync combiners available for purchase online, but I can't afford them right now. I would like to be able to build a simple circuit that does the job.