You are better off coming up with a prom adapter for this board to allow for a common ROM be used. These boards are repairable it is just sourcing out the PROM is getting expensive. The PROM is dead quite often too. The stern speech card or some of the other bally sound boards with unobtainable parts may be a better candidate for repo.

Also don't forget between the two PROMs there is components that need removed or added. Also there is a misprint on a resistor voltage divide circuit in the schematics / part lists that might throw you off (did to me once!). I wrote notes down about it somewhere if you need.

Andrew

[quote]
The component list for the -32 sound board incorrectly lists R28 as a
4.7k resistor when it should be a 15k resistor. The schematic drawing
is correct. R28 and R24 make a voltage divide. If you put a 4.7k
resistor at R28 you will crap out the clock output and get no sound
unless the clock is in a null state. With a 4.7k resistor at R28 you
will see 6v at U9 P2 when you should see 2v when correct.

A few months back I had a tough time with one of these sound boards
and i had replaced an open R28 with a 4.7k resistor. It took me a
while to find the mistake. In the last month i have gotten in for
repair two of these boards where someone replaced R28 with a 4.7k
resistor. So this misprint has messed up at least three people. I
figured i would let everyone know.
[/quote]

-51 PROM
Remove C22 and R28

-18 PROM
Add C22 and R28

Ken,

Did anything come about of that adapter, i am very intersted? I just spent a bunch of $ on PROMs because they are bad very often on boards that come in for repair.