Hello!
I have one... this was taken from the manual:
The Game switch:
0 - Both RAM and the hard drive are disabled
I - Only the hard drive is disabled
II - RAM and the hard drive are both enabled
The DIP switch:
1 - ON: Enable Hard disk / OFF: Disable Hard disk
2 - ON: Enable expansion RAM / OFF: Disable expansion RAM
3 - ON: For Kickstart 1.2 / OFF: For Kickstart 1.3 or higher
4,5,6,7,8 - ON/OFF: Reserved
Regards!