Re: Galaga - problems setting Rank D

From: Rodger Boots <>
Date: Fri Nov 05 2010 - 01:20:21 EDT

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 01:20:24 2010

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