I realize this post has been brought up in this forum but at this point I havn't found the solution to what I'm seeing.
I have a red board GT complete, the CRT monitor is toast but the person I bought it from was using an old 13" monitor connected directly to the vga port coming off the voodoo card. I bought a GBS-8200 in hopes that I could convert the CGA signal and play it on an LCD. So far I've bought a VGA male to female cord to connect the voodoo card back to the motherboard (since the one it comes with was missing), I've spliced the video wires coming out of the JAMMA and connected them to the 8 pin connector that comes with the GBS-8200. I've connected the GBS directly to a 12v adaptor that I plugged into the power strip inside the GT. After all that I went into the GBS-8200 settings, changed to English and messed around with the H-Size and V-Size settings, changed the ClampST to 03 and ClampSP to 04.
This has gotten me pretty close but I'm getting shaking and some picture distortion. Not sure what else to try at this point, I've heard people having various success with this setup, hoping it's something I can fix.
I've attached some pictures below.