I took the boards out of my galaga last night. If you have some of the following problems, a little "house cleaning" can get you going! Using two 2148s require that all 2147s be removed!
#Galaga free play dip switch install
Or you can remove the eight above rams and install two 2148s (1K x 4) in their place: Note: 2148 RAMs go in positions 6H and 6B. Note: 2147 RAMS are in positions 6M, 6L, 6K, 6J, 6F, 6E, 6D and 6C. Take a look at the pictures below, and this screen shot.īelow is a picture of the eight 2147 (4K x 1) RAMs that could cause the above problem: Normally you would have to swap out one ram at a time until you find the culprit. Bad video ram usually causes vertical lines in some or all of the graphics. If other manufacturers IC's are used it can cause timing problems.Ī classic case of bad video ram on the video pcb. When replacing a defective IC, use only Texas Instruments type (Ti). Here is a pic of the sound section containing the MB3730 Sound AMP and volume adjustment dial. On the Video board, there is a 6-in Molex video out connector. This is a secondary power feed along with the main harness. On the CPU board there is a 3-pin Moldex power connector. Galaga PCB edge connector pinoutsġ Ground this pin for cocktail mode 2 Extra pins for Gaplus/Galaga 3/Metro Cross/Namco Dig Dug, etc.
#Galaga free play dip switch Pc
RAM located on Video PC board at position K6 is bad RAM located on Video PC board at position J6 is bad RAM located on Video PC board at position M6 is bad RAM located on Video PC board at position L6 is bad RAM located on Video PC board at position H6 is bad RAM located on Video PC board at position F6 is bad ROM located on CPU PC board at position 3E is bad ROM located on CPU PC board at position 3J is bad ROM located on CPU PC board at position 3K is bad ROM located on CPU PC board at position 3L is bad ROM located on CPU PC board at position 3M is bad ROM located on CPU PC board at position 3N is bad RAM located on Video PC board at position 3J is bad RAM located on Video PC board at position 3H is bad RAM located on Video PC board at position 3L is bad RAM located on Video PC board at position 3K is bad RAM located on Video PC board at position 3F is bad RAM located on Video PC board at position 3E is bad RAM located on Video PC board at position 1K is bad
Below are the switch settings:ġ Player Game Press Player 1 Start 2, 3, 4 or 5 FightersĢ Player Game Press Player 2 Start 2, 3, 4, or 5 Fighters Eachġ Player Game Press Player 2 Start 5, 7, 9, or 11 Fightersĭifficulty Level Settins - "A" is the easiest and "D" is the most difficultĮrror codes.
Shown above are two banks of DIP switches on the Galaga CPU board.
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