                          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| ?
---------------------------------------------------------------------------
