It is do-able, but I don't think its been documented. Map out the chip connections with the jumpers in place for a -17 board and then hook up a -35 the same way.

Code memory:
h'1000
h'1800
h'5000
h'5800

The ROM addresses..
U2, U6
Bally mixed and matched the memory.
If an early game most likely the addressing needs to be h'1000,h'1800 for -17 board.
if 2732 then h'1000 through h'1FFF installed in U2
h' = hex ...= 0000 through FFFF..[hex number system = 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F.]
I think Evil Knievel is h'1000, h'1800
--------------------------------------
The problem is, if the ROM program is first h'1000, then h'5800..etc.
The program would jump to say a h'5xxx address and it is not there.
it depends on how the IC socket is jumped and the program format.
Bally 1980's IC program are
U2 h'1000, h'5000 == all on a xx32 prom
U6 h'1800, h'5800 == all on a xx32 prom
----------------------------------------
Bally other IC program
U2 h'1000, or h'5000
U6 h'1800, h'5800
with this combination U2 would have ether a h'1000 address or a h'5000 address.
U2 would be a xx16 PROM
U6 would be a xx32 PROM

There is one more jumper combination that is not
discussed... One special EPROM that is a xx64 that is in a 24pin format.
Very rare, it was made for a few years and discontinued??
U2 full address h'1000 through h'1800 then to h'5000 through h'5800.

Wire the 2732 address, chip enable and output enable pins the same way that it is on the -17 MPU with one chip at U2 jumpers. The E jumper pads are different on the -17 and -35 MPU, so you cannot reference that, check where the U2 pins would actual go to on the -17 and then mimic that on 2732. A11 would go to p21 since that is that is the extra address not used in a 2716. Pin21 is normally tied to Vcc on a 2716.

2716 (resized).png 2732 (resized).png

Jumper the board as you would for 2732s at both U2 and U6. Install your 2732 at U2. I’m fairly sure that will work. And, the board will be “universal” in that any ROMs can be made to work in it.
—
Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
Thank you for checking out the PinWiki - http://www.PinWiki.com/

The rom is for Mata Hari and is $1000-$1fff.

So double the ROM image and install at U2?
--
Chris Hibler - CARGPB #31
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The goal here is to mimic the-17 boards ability to be jumpered for one 2732 to avoid using two eproms.

Also $1000-$1fff is already the 2732 size.

I did some mods to Mata Hari code a few years ago, new features, some rule changes and millions scoring, etc. It requires two 2732 and a Bally-35 MPU board...
If you're interested, PM me.

Otherwise to answer your original question, try the following jumpers and install the single 2732 EPROM at U2
E12-Gnd ______________ U2 /CE ~ Pin 18 to Gnd
E11-E15 and E35-E16A __ U2 /OE ~ Pin 20 to /VUA-Ø2-A12
E13-E9 _______________ U2 A11 ~ Pin 21 to A11
E7-E8 ________________ U2 A9 ~ Pin 22 to A9

Remove any jumper at E13A above U1 - any other jumpers should be irrelevant.

He's getting your older version that fixes the drop banks and does the free play etc.

One of the fixes with the newer code is if you knock two targets down simultaneously, you get scores for both targets. In this situation, the factory stock code and my earlier version only scored for one drop target.

thanks. looks right. Good mod for people doing -17 software on a -35 MPU. Less IC sockets used/need replaced the better.

I'd like to add this info to the PinWiki.
To summarize, Bally games released with a -17 MPU can use a single 2732 at position U2 of a -35 MPU, by implementing the following jumpers (copied from @quench's post above.

E12-Gnd _____________ U2 /CE ~ Pin 18 to Gnd
E11-E15 and E35-E16A _ U2 /OE ~ Pin 20 to /VUA-O2-A12
E13-E9 ______________ U2 A11 ~ Pin 21 to A11
E7-E8 _______________ U2 A9 ~ Pin 22 to A9

Remove any jumper at E13A above U1 - any other jumpers should be irrelevant.

Does this require a special ROM load, or can the original 2716 ROM images simply be combined with:
copy /b U2.716+U6.716 CombinedU2.732

Thanks for documenting this method everyone here.
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Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
https://www.youtube.com/c/ChrisHiblerPinball
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Yep that's it