I can't say for sure - I'm guessing yes unless they wired up the prototypes differently and that the aux power board would need to be removed, you'd need a new cable to go from the CPU to the audio board as well as the new board and ROMs.

I do know that the tricky part in all of this is the A-12738 sound board. In the WPC boardset that's one of the more difficult to come by and you would likely have to pay over $200 for one if you don't have it already.

Good luck!

viperrwk

I don't have a proto FH and have never done this mod. So take what I'm saying with the usual caveat.

Having said that, looking at this photo:

http://ipdb.org/showpic.pl?id=966&picno=30741

J501 and J502 look like the standard plugs that would go into the A-12738 audio board with 501 carrying the AC voltage which normally gets rectified to +/-12v on the audio board and 502 carrying the logic voltage. If the voltages check out no reason they couldn't be used with the WPC audio board. The wires look long enough to fit.

Also this page - http://www.flippers.be/funhouse_prototype_guide.html - does not mention the xfmr being different on the FH prototype. Doesn't mean it's not but given everything documented here would have thought it would be mentioned.

viperrwk

Ah - there's your answer. Good find John.

The A-13502 "Sound Interface board" provides the +/-12v to the Sys11 sound board. The input to that board is 9.7VAC according to the schematic (and now I see that on the IPDB photo.) The WPC sound board needs 18VAC input. Unless you also change the xfmr it won't work.

Props to barron on the right call!

viperrwk