Still struggling with the colors. Mostly looks like grey is missing even if white or black is available. Maybe somebody is having an idea or hint?
The signal is going from video board to a GBS8200 (with gbscontrol) into a NEC Multisync X555UNV display. The result looks like this:
The signal is going from video board directly to upscaler (GBS8200):
The pinout is from here but I've compared it also with my original Virtua Racing Twin and schematics from owners manual (which seems to have green and blue swapped):
Pinout:
https://arcarc.xmission.com/PDF_Dip_Switches_and_Pinouts/Sega Model 1_pinout.pdf
Owners manual:
https://arcarc.xmission.com/PDF_Arcade_Manuals_and_Schematics/Virtua Racing Owner's Manual.pdf
What I have tried so far:
- Used another input of the scaler but pins seem to be connected so no difference in results. Also reset all scaler settings.
- Connected the scaler (with a beamer at the VGA output) directly to the filter board on game stack within Virtua Racing Twin but exact same results.
As results are same with or without filter board I assume it's not required.
So my conclusion is that either scaler is not compatible or my cabling is somehow incorrect.
Maybe somebody has already experience in connecting a Model 1 to a VGA output / LCD display?
I am a totally newbie when it is about video signals.
Model 3 is just working from VGA output of filter board to the same display using a VGA cable.