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Document Title: [Galaga.txt (text file)]
Galaga pinouts.  This also works on Midway's Mappy game

                               GALAGA/MAPPY

                        PARTS SIDE  |  SOLDER SIDE
------------------------------------|--------------------------------------
                      LOGIC GND | A | 1 | LOGIC GND
--------------------------------|---|---|----------------------------------
                           SPKR | B | 2 | SPKR (Not sure of polarity)
--------------------------------|---|---|----------------------------------
                            --- | C | 3 | COIN METER
--------------------------------|---|---|----------------------------------
                            --- | D | 4 | ---
--------------------------------|---|---|----------------------------------
                                | E | 5 |
--------------------------------|---|---|----------------------------------
                            +5v | F | 6 | +5v
--------------------------------|---|---|----------------------------------
                      LOGIC GND | H | 7 | LOGIC GND
--------------------------------|---|---|----------------------------------
                      CREDIT SW | J | 8 | TEST SWITCH (Tilt connected to this)
--------------------------------|---|---|----------------------------------
 (2nd coin mech also) 1 COIN SW | K | 9 |
--------------------------------|---|---|----------------------------------
                       1P START | L | 10| 2P START
--------------------------------|---|---|----------------------------------
  (To rapid fire brd #7)   FIRE | M | 11|
--------------------------------|---|---|----------------------------------
                      MOVE LEFT | N | 12|
--------------------------------|---|---|----------------------------------
                                | P | 13|
--------------------------------|---|---|----------------------------------
                     MOVE RIGHT | R | 14|
--------------------------------|---|---|----------------------------------
                                | S | 15|
--------------------------------|---|---|----------------------------------
                            --- | T | 16| ---
--------------------------------|---|---|----------------------------------
                            --- | U | 17| ---
--------------------------------|---|---|----------------------------------
                            --- | V | 18| ---
--------------------------------|---|---|----------------------------------
                            --- | W | 19| ---
--------------------------------|---|---|----------------------------------
                                | X | 20|
--------------------------------|---|---|----------------------------------
                                | Y | 21|
--------------------------------|---|---|----------------------------------
                      LOGIC GND | Z | 22| LOGIC GND
---------------------------------------------------------------------------


On the CPU board there is an additional 3-part connector.  This is power.
It's wired as follows:

            1 - +12v
            2 - GND
            3 - +5v

On the Video board, there is an additional 6-part connector.  This is
the video connector.  It's wired as follows:

            1 - RED
            2 - GRN
            3 - BLU
            4 - SYNC
            5 - VIDEO GND
            6 - (Not used)

Galaga also has the option of a Rapid Fire board.  This is a small board
that allows the fire button to be held down and your ship to continuously
fire shots at the enemy.  Holding this board with the circuits facing you 
and the connectors on the bottom, the pins are numbered 1-9 (with #3 missing).
The top set of connectors (J-1) is used for rapid fire, the bottom set (J-2)
is used for single fire.  It's wired as follows:

            1 - (Not used)
            2 - (Not used)
            3 - (Not present)
            4 - (Not used)
            5 - FIRE BUTTON (GND)
            6 - LOGIC GND
            7 - FIRE (From Galaga CPU board)
            8 - FIRE BUTTON
            9 - +5v


z_morganrw@ccsvax.sfasu.edu

                                 Addendum
                                 ========
From: vecoven@montefiore.ulg.ac.be (Frederic Vecoven)
Newsgroups: rec.games.video.arcade.collecting
Subject: GALAGA error messagesFor information :
Date: Thu, 23 Feb 1995 10:18:57 MET

Here are the error messages displayed by Galaga. (original boards set,
and pirated one !)


2 boards Galaga (midway)

Display     Description
RAM OK      All RAMs are good
RAM 0L      RAM located on Video PC board at position 1K is bad
RAM 0H      RAM located on Video PC board at position 1K is bad
RAM 1L      RAM located on Video PC board at position 1K is bad
RAM 1H      RAM located on Video PC board at position 1K is bad
RAM 2L      RAM located on Video PC board at position 3E is bad
RAM 2H      RAM located on Video PC board at position 3F is bad
RAM 3L      RAM located on Video PC board at position 3K is bad
RAM 3H      RAM located on Video PC board at position 3L is bad
RAM 4L      RAM located on Video PC board at position 3H is bad
RAM 4H      RAM located on Video PC board at position 3J is bad

ROM OK      All ROMs are good
ROM 01      ROM located on CPU PC board at position 3N is bad
ROM 02      ROM located on CPU PC board at position 3M is bad
ROM 03      ROM located on CPU PC board at position 3L is bad
ROM 04      ROM located on CPU PC board at position 3K is bad
ROM 11      ROM located on CPU PC board at position 3J is bad
ROM 21      ROM located on CPU PC board at position 3E is bad
}