I found these information, tested and seems correct. * = Default value DIP SW 1 ======== 1 - Demo Sounds OFF - Disabled ON - Enabled * 2 - In Game BGM OFF - Disabled ON - Enabled * 3 - Coinage: 4 - Coinage: 3 4 <- DIP# ------------- OFF OFF 1 COIN 1 CREDIT * ON OFF 1 COIN 2 CREDITS OFF ON 2 COINS 1 CREDIT ON ON 3 COINS 1 CREDIT 5 - Female Voices OFF - Enabled * (notice OFF enables here) ON - Disabled 6 - Difficuilty 7 - Difficuilty 8 - Difficuilty 6 7 8 <- DIP# ----------------- OFF OFF OFF - 1 EASIEST ON OFF OFF - 2 OFF ON OFF - 3 ON ON OFF - 4 OFF OFF ON - 5 * ON OFF ON - 6 OFF ON ON - 7 ON ON ON - 8 HARDEST DIP SW 2 ======== 1 - Unused OFF * 2 - Unused OFF * 3 - Test Mode OFF - Game Mode * ON - Test Mode 4 - Screen Flip OFF - Normal * ON - Inverted 5 - Unused OFF * 6 - Unused OFF * 7 - Unused OFF * 8 - Unused OFF *