Las instrucciones que tengo dicen esto de los pines:
Sega C64
(male) (female)
5 7
6 1 or 5 (see notes**)
7 6
8 8
Notes:
** 1) If Sega Switch wired to Ground signal, then connect to C64 Pin1
Method is Light Pen compatible, eg Micro Illustrator
2) If Sega Switch wired to 5V signal, then connect to C64 Pin5
Method is Light Gun compatible, eg Operation Thunderbolt
3) The "button" with GEOS's LightPen Driver is supposedly Pin 5