+1 for the goats answer.Yes, the 9 pin version requires components in the SCART cable. The 8 pin version doesn't.
8 pin is standard XRGB pinout
(straight through, no resistors or caps in the cable required, sync and r, g, b are already attenuated on the Minigun.)
9 pin is standard Megadrive 2 pinout
red , green and blue are NOT attenuated on the Minigun, will need to be attenuated with resistor and capacitor in the scart shell. ensure the sync jumper is set to 75 ohm on the Minigun itself