I hope someone clever can help!
For some reason I'm really struggling to get my MISTer working properly with the 15khz RGB CRT monitor in my Jamma arcade cabinet - my plan was to finally replace my old PC + ArcadeVGA combo. I have the v6 IO board and 64mb SDRAM module and can get everything working well over HDMI. However, I have two problems when hooking up to the arcade monitor:
1 - The green channel is entirely missing - red and blue are fine, green is totally absent.
2 - I cannot figure out the proper settings to get vertical arcade cores to rotate for my horizontal monitor.
The missing green signal is very odd. I am 100% certain that the cabling from the VGA connector all the way to the monitor is good as I have tried swapping the red, green and blue signals around - the MISTer is simply outputting nothing on the green signal pin when configured for 15khz output.
I don't think it's a hardware problem, because if I reconfigure with scandoubler enabled and try on a 31khz VGA monitor the green signal is present and correct.
As for rotating vertical cores, the image is brilliant (apart from the missing green) with the default settings but vertical arcade cores are unusable and don't seem to have a rotate option. If I enable the scaler on VGA I can rotate the image, but I can't get a decent picture - anyone have a good custom video mode they can suggest?