Nebulous Bee (Galaga bootleg) First EPROM (location 4R) checksum $DBE1 Typed in by Martin Olsson (martin@algonet.se) 01-07-19. I take no responsibility whatsoever to what may happen to your circuit board if you use this pin configuration. 36-pin edge connector: Component side Pin Solder side 1 VIDEO SYNC 2 VIDEO GREEN 3 VIDEO BLUE VIDEO RED 4 LEFT FIRE 5 RIGHT PLAYER 2 START 6 PLAYER 1 START 7 COIN 8 9 COIN +5V 10 +5V +5V 11 +5V 12 13 +12V 14 +12V SPEAKER + 15 SPEAKER - GND 16 GND GND 17 GND GND 18 GND DIP Switch settings: DIP Switch 1 (location 1J) Galaga 'standard' DIP Switch 2 (location 1M) Galaga 'standard' except FREE PLAY (switch1=ON switch2=ON switch3=ON (doesn't work)) ======= Nebulous Bee (36-pin Galaga Clone) Parts Side | Solder Side --------------------------|-------------------------- P2 Fire | 1 | A | Video Sync --------------------|-----|-----|-------------------- P2 Left | 2 | B | Video Green --------------------|-----|-----|-------------------- P2 Right | 3 | C | Video Blue --------------------|-----|-----|-------------------- Video Red | 4 | D | P1 Left --------------------|-----|-----|-------------------- P1 Fire | 5 | E | P1 Right --------------------|-----|-----|-------------------- P2 Start | 6 | F | P1 Start --------------------|-----|-----|-------------------- Table* | 7 | H | Coin 1 --------------------|-----|-----|-------------------- GND** | 8 | J | GND** --------------------|-----|-----|-------------------- N/C | 9 | K | Coin 2 --------------------|-----|-----|-------------------- +5V | 10 | L | +5V --------------------|-----|-----|-------------------- +5V | 11 | M | N/C --------------------|-----|-----|-------------------- Test Switch | 12 | N | N/C --------------------|-----|-----|-------------------- N/C | 13 | P | N/C --------------------|-----|-----|-------------------- +12V | 14 | R | +12V --------------------|-----|-----|-------------------- Speaker(+) | 15 | S | Speaker(-) --------------------|-----|-----|-------------------- GND | 16 | T | GND --------------------|-----|-----|-------------------- GND | 17 | U | GND --------------------|-----|-----|-------------------- GND | 18 | V | GND ----------------------------------------------------- *Test - Ground this pin for Cocktail mode **GND - Pins 8 and J are tied together and lead to the same ground as pins 16-18,T-V. Maybe it is Video Ground or the grounds that are run out to the control panels? DIP Switch settings: DIP Switch 1 (location 1J) Galaga 'standard' DIP Switch 2 (location 1M) Galaga 'standard' except FREE PLAY (switch1=ON switch2=ON switch3=ON (doesn't work))