Bally MPU-35 'best' jumper settings? (Is my assumption correct?)

AE35

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Bally MPU-35 'best' jumper settings? (Is my assumption correct?)

Hi

I'm fixing a board with battery damage, and all the chips are gone.
I do have the rams, CPU, and PIA though.

I've been looking through this list of jumper settings:
http://www.flippers.com/bally-tips.html

...and I feel that the
U1 2716 PROM 1-5, 2-4, 7-8, 11-25, 10-12,
U2 2716 PROM 13A-14, 31-32, 33-35, 16A-18
U6 2716 PROM

is the smartest, since U1, U2 and U6 then use 2716s which I can burn
on my EPROM burner.

Is this sound reasoning, or should I choose another setting?

Thanks!

Nicholas
 
If I'm building a board up where I don't have existing PROM's/EPROMS's, I typically just configure it for 2732's:

Jump E4 to E13a
Jump E12 to GND
Jump E7 to E8
Jump E10 to E11
Jump E31 to E32
Jump E16a to E29
Jump E33 to E35

If you've got piles of 2716's laying around however, and not many 2732's, you can certainly stick with having it configured for 2716's - all depends on what you have on hand at the time. I've got plenty of both, so depending on what I'm using the board for, I'll go one way or the other.

If you're going to be burning EPROMs either way, you may find it easier to just modify the jumpers based upon which configuration it's closest to in it's current setup, but going with the 2732 configuration gives you maximum flexibility in my opinion..
 
Basically, you can jumper the board once, and it'll work for any Bally game. You also can get by with two 2732's (one at U2, one a U6), vs. three 2716's (one at U1, one at U2, and one at U6. Plus, if you wanted to take that board and use in a game that requires a larger EPROM, you'll end up having to restrap it to 2732's (or 2532's) anyway.

So - strap it for 2732's right off the bat, and unless you absolutely must use the original chips from a game for some reason, you can just burn up some 2732's (even if you're doing an early Bally game that doesn't need the full capacity) and you're set.

If I'm just repairing a board that has a full set of known-good PROM's or EPROM's, I don't bother - no need to take the chance in damaging a trace.
 
Ok, thanks!

So this config:

Jump E4 to E13a
Jump E12 to GND
Jump E7 to E8
Jump E10 to E11
Jump E31 to E32
Jump E16a to E29
Jump E33 to E35

Would allow me to use 2732s in U1, U2 and U6? Or only U2 and U6? or both?

Could you give me an example as to what games need the larger eproms?

Thanks for your help!! I really appreciate it
 
Newer Bally games like Centaur and Fathom would use them, for example, at U2 and U6 - you wouldn't need to use U1.

Some sources of the ROM's will already have them combined/configured for burning directly to a 2732, but worst-case you can download them from IPDB and combine them yourself as well.
 
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