williams bally CPU Compatibility?

[Tony]

I'm after some advise, I may be requiring a CPU if I cant fix mine on my JD, the JD has A-12742 WPC (I believe this is also known as a (DCS CPU I think the sound chip was bettered?) will a later WPC-S cpu work? ( I have read that this has a security chip?)
I think I have read that the chips will require changing over, if these are socketed then fine, but what's the best way of removing U9?
Any advise would be appreciated thanks

Tony

 

[Jay Walker]

Hi, Tony,

I don't think that an 'S' board would work straight off (if at all) in a Judge Dredd; it might well start, but then halt displaying 'U22* Error' since Dredd didn't use a security chip. The manual for Roadshow, the second game on the 'S' board, states that it's not backward compatible.

'DCS' is more of an audio board description - it was first used on Indiana Jones PBA.

The ASIC U9 is best removed using a special tool which lifts all four corners at once.