for Space Invaders..

SW1: ON- Coin information is displayed on screen
     Off- Coin information is not displayed

SW2:      On- Bonus base awarded at 1500 Pts
     Off- Bonus base awarded at 1000 Pts

                    SW3  SW4
3 Bases per game         On   On
4 Bases per game         On   Off
5 Bases per game         Off  On
6 Bases per game         Off  Off

SW 5,6,7,8 are not used.