Re: Galaga - problems setting Rank D

From: Rodney Minch <>
Date: Fri Nov 05 2010 - 10:06:33 EDT

Interesting. This board is an original Midway Galaga CPU and Video board
and has 3 Z80's.

Is it possible a ROM revision is responsible for the dip switch changes?


On Fri, Nov 5, 2010 at 1:20 AM, Rodger Boots <> wrote:

> Looking through MAME it seems there was a bootleg board that used switches
> 1 & 2 for difficulty settings. This is also the board that has 4 Z80s
> instead of 3 Z80s and a custom chip.
> On Thu, Nov 4, 2010 at 10:37 PM, Rodney Minch <> wrote:
>> Matt - you nailed it. I was just getting ready to send out an email with
>> what I discovered tonight when I saw your post. I put the game back in test
>> mode and started moving the dip switches one by one to see what changes it
>> made, which is when I discovered that on this boardset SW1 and SW2 control
>> the difficulty. Once I put SW1 on and SW2 off the game was showing Rank D.
>> Did Namco release a service bulletin or anything like that to let people
>> know that the dip switch settings on some boards are different? I couldn't
>> find any information that talked about this. The multiple sources where I
>> looked up the dip switch settings for Galaga were all the same as the
>> manual, which states SW2 & SW3 control the difficulty/rank.
>> Rodney
>> On Thu, Nov 4, 2010 at 11:15 PM, Matt J. McCullar <>wrote:
>>> Rodney, I don't have my _Galaga_ notes handy right now, but I think
>>> there may be the slight possibility that some _Galaga_ boardsets had
>>> slightly different DIP switch settings for difficulty levels. I think I had
>>> a similar problem a while back but I can't remember for sure. If the
>>> boardset you have is at least working properly, put it into self-test and
>>> see if other DIP switches might have some effect.
>>> Matt J. McCullar
>>> Fort Worth, TX
>>> -----Original Message-----
>>> *From:* [mailto:
>>>]*On Behalf Of *Rodney Minch
>>> *Sent:* Wednesday, November 03, 2010 11:34 AM
>>> *To:*
>>> *Subject:* RASTER: Galaga - problems setting Rank D
>>> I've got an original Galaga board that I've set the dip switches to Rank
>>> D (Dip Switch 6J, SW2=On, SW3=Off) but the game shows it's set to Rank C. I
>>> can only get the game to show Rank A or Rank C. Basically SW2 is always
>>> stuck at Off no matter if the dip switch is set to on or off. I've used my
>>> DMM to verify SW2 is working properly. I also verified the trace going from
>>> SW2 to pin 3 of the 74LS151 at 4K is good per the schematics.
>>> All the other dip switches at 6J are working fine along with all the dip
>>> switches at 6K. Any ideas what could be going on here? Could the 74LS151 at
>>> 4K be bad?
>>> The weird thing is another person local to me had a Galaga board that was
>>> doing the exact same thing as this one. Not sure if this is a common
>>> problem or what.
>>> Any help would be appreciated. Thanks.
>>> Rodney

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Received on Fri Nov 5 10:06:37 2010

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