debaser138
Well-known member
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.
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.