Galaga - problems setting Rank D

debaser138

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I've got a 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.

Any help would be appreciated. Thanks.
 
Figured out the problem and thought I would post it for others. Apparently some Galaga boards use SW1 & SW2 for the Rank setting and not SW2 & SW3 like the Galaga manual says. Once I figured that out I was able to successfully set the game to Rank D.

FYI, this is an official Midway Galaga CPU & Video board although some Galaga bootleg boards use this same dip switch setting.

Rodney
 
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