Most CSYNC cables have this reistor already in place. But if you plan to use a composite video cable for sync you must either have an attenuation resistor in the cable or you can make a simple modification to the GCDUAL.
Replace R3 with a resistor between 430-570 Ohms on the main PCB and this will force attenuated sync out
Horizontal and Vertical Sync signals are located on the main board. They are easily accessed by test pads. A jumper wire must be used. If want VGA into the multi-out I recommend connecting them to the Chroma/Luma Test pads on the QSB. Remember on NTSC consoles Chroma & Luma must be disconnected from the motherboard.
There are many combinations that you can choose to fit your needs and specific setup. For NTSC consoles if use the Chroma / Luma / Composite video on the multi-out you must disconnect these from the system. This is accomplished by either a trace cut or lifting a component. PAL consoles have the R/G/B/S connected and must be disconnected, but do not have Chrome/Luma Connected.
|CSYNC from GC-Video is connected to the CSYNC pin on the mutli-out. This is going be the most common setup. 99% of users will have this setup.|
|CSYNC from GC-Video is connected to the Luma pin on the mutli-out.
On NTSC Consoles luma pin must be disconnected from the motherboard.
|CSYNC from GC-Video is connected to the Composite Video pin on the mutli-out.
*composite video pin must be disconnected from the motherboard.
|CSYNC from GC-Video is connected to the CSYNC pin on the mutli-out. Mode detect is connected to the Luma pin on the mutliout. RGBS works as normal, but if a custom cable is connected that grounds the luma pin, YPbPr is automatically turned on.
on NTSC consoles luma pin must be disconnected from the motherboard.
|Mode pin is connected to ground all the time. RGBS will never be shown and the reason CSYNC from GC-Video is not connected to anything.|