Old Bally jumper confusion/query

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By pinballslave

4 years ago


  • Started 4 years ago
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  • Latest reply 4 years ago by pinballslave
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    #1 4 years ago

    I'm trying to understand the significance of the jumpers on old Bally/Stern CPUs...

    I was hoping the jumper locations would help me identify what some boards I took out of some games (and like an idiot didn't mark up!!) are for which game, but I'm starting to think that maybe the jumper locations won't help...

    So, here are some general questions for anyone who understands these things;

    1) Does each game have a unique set of jumpers that would identify which game the board is from (or at least pin it down to a handfull of options)?

    2) I have 2 boards with these jumpers:


    Which game(s) could this board be from?

    Any general advice about what jumpers are for and how to identify these boards is greatly apppreciated!!

    #2 4 years ago

    Three masked 9316 = E1-4,2-6,7-8,9-11,12-36,13-15,16a-19,31-32,33-34

    Could be a lot of different games. If your not sure what roms it would be any game that uses three 9316 roms.

    #3 4 years ago

    So is it true to say that the jumper locations are more a reflection of the type of ROM used instead of a reflection of the which game it is...?

    I recently found this:


    Here you can read the printed info on the ROM and identify it from this chart if it's a Bally game, so this is a great healp for what I'm trying to achieve

    #4 4 years ago

    Right, jumpers just tell you what type of ROMS the board is strapped for. There are many choices from this era.

    Generally, the accepted 'standard' seems to be converting the board to use 2732s at U2 and U6, because they are more available than other types. Some chips, like the 9316s, are long obsolete.

    #5 4 years ago

    Thanks for you input JW!

    I'm a dumb-ass when it comes to these things, electronics being something I definitely need to get to grips with in this hobby!!

    I also found this site:


    Which lists games versus jumpers... or is it saying that certain games had certain ROMs and THAT's why they have the stated jumpers (and not because of the game)? I have a Playboy and the board has jumpers that are different from those stated on this list... All my games are exports because I'm from Europe, so maybe this affects things??

    Your patience is greatly appreciated in trying to help me on this... like I say, I'm very dumb in these things!! Is there a site that explains this stuff for dummies?? Understanding how to convert to 2732's would be useful/educational no doubt!! Most of my boards are original using the 9316's... I guess that's fine as long as they still work...

    Thanks for all advice!!

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