Taito G-Net info

I've been looking around for some info on the Taito G-Net board and games. The best I found was a
text doc describing the layout of the board. Anyone have a more descriptive picture of these pinouts:

CN506 - Connector for optional 3rd player controls
CN505 - Connector for optional 4th player controls
CN503 - Connector for optional 15kHz external video output (R,G,B,Sync, GND)
CN504 - Connector for optional 2nd speaker (for stereo output)
CN652 - Connector for optional trackball
CN651 - Connector for optional analog controls
CN654 - Connector for optional memory card

S551 - Dip switch (4 position, defaults all OFF)

If I remember right, DIP 2 is system settings and DIP 4 is game settings. Any idea what the other two are for?

Also looking for translated game setup screens. Any help would be appreciated.

Thanks!