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                            G A L A G A
                           =============
                          by Brian Murray
                   (brian@demon.csd.unsw.edu.au)

There are apparently many different galaga implementations, this one
happens to be mine. I don't know how I would identify my particular
boards, but I'll give as much as I can. (They were from a tabletop
if that matters). There are two boards, both with blue solder masks.
The top one (slightly larger) is the CPU board, has the 4 processors
and program EPROMS, and holds a small credit-card sized daughter
board that plugs into a 28-pin DIP socket near the EPROMS. It also has
'DG-09-2' silk-screened in one corner near the main connector. The bottom
board is the video board. It has a small 5 pin connector in one corner
for the video output signal, wired as follows :

(closest to corner of board) 1 - Red
                             2 - Blue
                             3 - Green
                             4 - Sync
                             5 - Video GND

Note in my game, this connector has had wires soldered straight to it
and these brought around and soldered to the main connector in the
positions shown below, and the monitor wired to this connector instead.

Main connector:

                        PARTS SIDE  |  SOLDER SIDE
------------------------------------|--------------------------------------
                            GND | A | 1 | GND
--------------------------------|---|---|----------------------------------
                            GND | B | 2 | GND
--------------------------------|---|---|----------------------------------
                            +5V | C | 3 | +5V
--------------------------------|---|---|----------------------------------
                            +5V | D | 4 | +5V
--------------------------------|---|---|----------------------------------
                                | E | 5 |
--------------------------------|---|---|----------------------------------
                                | F | 6 | tabletop (closed) or upright (open) SW
--------------------------------|---|---|----------------------------------
              Player 1 RIGHT SW | H | 7 | Player 2 RIGHT SW
--------------------------------|---|---|----------------------------------
               Player 1 LEFT SW | J | 8 | Player 2 LEFT SW
--------------------------------|---|---|----------------------------------
               Player 1 FIRE SW | K | 9 | Player 2 FIRE SW
--------------------------------|---|---|----------------------------------
              Player 1 START SW | L | 10| Player 2 START SW
--------------------------------|---|---|----------------------------------
                                | M | 11| Coin SW
--------------------------------|---|---|----------------------------------
                                | N | 12| Test/Setup Mode SW
--------------------------------|---|---|----------------------------------
          Video Red (see above) | P | 13|
--------------------------------|---|---|----------------------------------
        Video Green (see above) | R | 14|
--------------------------------|---|---|----------------------------------
         Video Blue (see above) | S | 15|
--------------------------------|---|---|----------------------------------
         Video Sync (see above) | T | 16|
--------------------------------|---|---|----------------------------------
                                | U | 17| Speaker (to GND)
--------------------------------|---|---|----------------------------------
                           +12V | V | 18| +12V
--------------------------------|---|---|----------------------------------
                            +5V | W | 19| +5V
--------------------------------|---|---|----------------------------------
                            +5V | X | 20| +5V
--------------------------------|---|---|----------------------------------
                            GND | Y | 21| GND
--------------------------------|---|---|----------------------------------
                            GND | Z | 22| GND
---------------------------------------------------------------------------

Power comes in on the above connector.

                                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

The standard Galaga pinout (for the Midway boards) contains the error
messages for that boardset and which location on the board is causing
the problem.

Now, this information does NOT correspond with the galaga pirated
(the "blue" boards). As I had to desolder all the RAMs of my board,
I noted the error messages (I removed one RAM at a time, boot the game,
and see the error message !) Here are the results :

All RAMs are 2114.

Video Board
===========
6F      RAM 2L
        G
6H      RAM 2H
        G
6J      RAM 4L
        G
6K      RAM 4H
        G
6L      RAM 3L
        G
6M      RAM 3H
        G

Main board
==========
5D      the game displays "RAM OK" but you can't exit the setup page.

5C      the game displays "RAM OK", then reboot forever.

 


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