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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. Galaga DIP switch settings. The following information has been copied from wiretap.spies.com (original submission by z_morganrw@ccsvax.sfasu.edu) but slight changes have been made to reflect my game. There are two sets of DIP switches on the Galaga CPU board. I'll label them SWA and SWB following the schematic. SWA is closest to the corner of the board (located at 11C), SWB closest to the main connector (located at 11E). Switch bank SWA sets the number of credits, lives and lives given at certain scores. (This is identical to switch bank 6K as specified by z_morganrw@ccsvax.sfasu.edu) : SW1 SW2 SW3 (Coins per Credit) -------------------------------------------- ON ON ON FREE PLAY (although this doesn't seem to work for me) ON ON OFF 4 Coins 1 Credit ON OFF ON 3 Coins 1 Credit ON OFF OFF 2 Coins 1 Credit OFF ON ON 2 Coins 3 Credits OFF ON OFF 1 Coin 3 Credits OFF OFF ON 1 Coin 2 Credits OFF OFF OFF 1 Coin 1 Credit SW4 SW5 SW6 (Bonus ships awarded.) Began with 2, 3, Began with 5 or 4 fighters fighters. ---------------------------------------------------------------- 1st SHIP 20000 1st SHIP 30000 ON ON OFF 2nd SHIP 60000 2nd SHIP 100000 AND EVERY 60000 AND EVERY 100000 ----------------------------------------------- 1st SHIP 20000 1st SHIP 30000 ON OFF ON 2nd SHIP 70000 2nd SHIP 120000 AND EVERY 70000 AND EVERY 120000 ----------------------------------------------- 1st SHIP 20000 1st SHIP 30000 ON OFF OFF 2nd SHIP 80000 2nd SHIP 150000 AND EVERY 80000 AND EVERY 150000 ----------------------------------------------- 1st SHIP 30000 1st SHIP 30000 OFF ON ON 2nd SHIP 100000 2nd SHIP 100000 AND EVERY 100000 ----------------------------------------------- 1st SHIP 30000 1st SHIP 30000 OFF ON OFF 2nd SHIP 120000 2nd SHIP 120000 AND EVERY 120000 ----------------------------------------------- 1st SHIP 20000 1st SHIP 30000 OFF OFF ON 2nd SHIP 60000 2nd SHIP 150000 ----------------------------------------------- 1st SHIP 30000 ONE SHIP 30000 OFF OFF OFF 2nd SHIP 80000 ONLY ----------------------------------------------- ON ON ON NO BONUS SHIPS GIVEN WITH THIS SETTING ---------------------------------------------------------------- SW7 SW8 (Number of fighters to start with) ---------------------------------------------------------------- ON ON 2 Space Fighters ON OFF 3 Space Fighters OFF ON 4 Space Fighters OFF OFF 5 Space Fighters SWB is used for setting the difficulty of Galaga. Switches SW4, SW7, and SW8 don't appear to do anything. (This differs slightly from switch bank 6J as specified by z_morganrw@ccsvax.sfasu.edu) : SW1 SW2 ------------------------------------------------- OFF OFF Rank "A" - Easiest level of play. ON ON Rank "B" OFF ON Rank "C" ON OFF Rank "D" - Hardest level of play. SW3 ------------------------------------------------- ON Some sort of test/debug mode, do not use OFF Normal operation SW5 (The "damn the phone's ringing" switch :-) ------------------------------------------------- ON Freeze game OFF Normal operation SW6 ------------------------------------------------- ON Automatic rack advance (cheat mode). OFF Normal operation

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