Mayday!! [and bootleg Defender] CPU/Sound board connector: COMPONENT SIDE | SOLDER SIDE ------------------------------------|-------------------------------------- GND | A | 1 | GND --------------------------------|---|---|---------------------------------- +5V | B | 2 | +5V --------------------------------|---|---|---------------------------------- +12V | C | 3 | +12V --------------------------------|---|---|---------------------------------- -5V | D | 4 | -5V --------------------------------|---|---|---------------------------------- ===== KEY ===== | E | 5 | ===== KEY ===== --------------------------------|---|---|---------------------------------- (GND) SPK - | F | 6 | SPK + --------------------------------|---|---|---------------------------------- NC | H | 7 | NC --------------------------------|---|---|---------------------------------- | J | 8 | --------------------------------|---|---|---------------------------------- | K | 9 | --------------------------------|---|---|---------------------------------- | L | 10| --------------------------------|---|---|---------------------------------- | M | 11| Fire Forward --------------------------------|---|---|---------------------------------- Thrust | N | 12| Mayday [Smart Bomb] --------------------------------|---|---|---------------------------------- [Hyperspace] Fire Back | P | 13| [Reverse] --------------------------------|---|---|---------------------------------- Down | R | 14| Up --------------------------------|---|---|---------------------------------- 2P Start | S | 15| 1P Start --------------------------------|---|---|---------------------------------- | T | 16| --------------------------------|---|---|---------------------------------- | U | 17| --------------------------------|---|---|---------------------------------- | V | 18| --------------------------------|---|---|---------------------------------- | W | 19| --------------------------------|---|---|---------------------------------- Test? | X | 20| Coin --------------------------------|---|---|---------------------------------- | Y | 21| Service/Coin? --------------------------------|---|---|---------------------------------- Coin | Z | 22| NC --------------------------------------------------------------------------- Video board connector: COMPONENT SIDE | SOLDER SIDE ------------------------------------|-------------------------------------- GND | A | 1 | GND --------------------------------|---|---|---------------------------------- GND | B | 2 | GND --------------------------------|---|---|---------------------------------- +5V | C | 3 | +5V --------------------------------|---|---|---------------------------------- +12V | D | 4 | +12V --------------------------------|---|---|---------------------------------- ===== KEY ===== | E | 5 | ===== KEY ===== --------------------------------|---|---|---------------------------------- -5V | F | 6 | -5V --------------------------------|---|---|---------------------------------- Video GND | H | 7 | Sync --------------------------------|---|---|---------------------------------- Red | J | 8 | Green --------------------------------|---|---|---------------------------------- Blue | K | 9 | NC --------------------------------|---|---|---------------------------------- GND | L | 10| ? ---------------------------------------------------------------------------