Build Your Own Arcade Controls Forum
Main => Monitor/Video Forum => Topic started by: grosenberry on November 01, 2020, 11:32:24 am
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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.
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you'll find another thread where I explain that the video output by golden tee games is not quite standard. the GBS8200 doesn't quite get close enough to the resolution output to sync properly...not an issue with CRT where you can just squash the picture to work...but an LCD needs an exact resolution in order to buffer the frame and send it to the display. golden tee outputs 25.7khz and the standard for EGA (medium) resolution of the GBS is 23.5 - 25.5khz
see my post here regarding the odd resolutions...
http://forum.arcadecontrols.com/index.php/topic,129561.msg1325609.html#msg1325609
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Ok so that definitely explains the reason I can't get picture while in Medium resolution. The picture that I'm showing above is definitely in low resolution. Starting to lose a little faith, rather wouldn't pay 100's of dollars for a new CRT monitor. I know I've seen completes with this setup, just wish someone had the exact formula.
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I've had luck with benq brand LCD's syncing up okay to the golden tee resolution. it's been a while since i've had to convert one (we've since gotten rid of all our machines) but with the way consumer devices and stuff changing al the time has been going the last few years it might not still be the case.
alternatively, betson has some new LCD company goldfinger that looks like they make a pretty capable LVDS board taking in all kinds of resolutions and connections RGB VGA HDMI DVI etc... that may sync up 100%