Strikes and Spares
Bally, 1978The switches all register in switch test, but four of them will not register in game play. Also, this game has two 100 point pop bumpers. If I hit one, it scores points, but the other one fires. Same if I activate the other one; it scores points but the other one fires.
I have swapped U-10 with a known good chip with no changes. Why would they register in test but not gameplay? And the opposite bumper firing is very strange. Anybody have any ideas?
Quoted from Bodean:Why would they register in test but not gameplay? And the opposite bumper firing is very strange. Anybody have any ideas?
Could be in test you’re activating the switch with your finger and a ball doesn’t do exactly the same thing.
The bumpers are wired wrong somewhere. Pins switched at the board or wires crossed on the playfield. Double check the wire colors in the manual and make sure they are connected at the right spots.
Ok, figured out the pop bumper problem; the pins were indeed switched. Not sure how I missed that. Anyway, Switches 12,13,14, and 31 all work in test mode, but will not work in game mode. I'm using my finger to actuate them in both test and game mode. I've tried different PIAs and 6800s with no change. This is a strange one. I've brought back quite a few Ballys and have never seen this.
If the diodes were bad, they wouldn't work at all. Hate to throw another MPU in it just for this.
You're not by any chance running Power Play ROMs which doesn't use switches 12, 13, 14, and 31 for game play?
Wow, Quench! You da man! It does indeed have a Power Play ROM at U2. U6 is correct. I just ASSumed the ROMs were correct. I should have known better. A friend asked me to revive this machine. Total basket case. Every board needed work.
Anyway, haven't had to order ROMs for a while. Who does it now that John Wart is out of the game?
Quoted from Bodean:Anyway, haven't had to order ROMs for a while. Who does it now that John Wart is out of the game?
I program my own so don't know who provides this service. Hopefully someone else can comment - otherwise pretty sure you can get licensed copies on ebay.
Quoted from Bodean:had to order ROMs for a while. Who does it now
Meloyelo51 has a Pinside shop at https://pinside.com/pinball/biz/directory/1335-matt-s-basement-arcade
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