Quoted from Pesmerga:Is it possible to use this board + wpc89 video board to replace the av board on wpc95 ? Like is done with the pinsound..if yes, there is a guide on how to? Thanks!
Yes and no!
Tilt!Audio works according to the same principle, but what claim Pinsound is not quite correct (it will never be 100% compatible with WPC-95).
The A/V board (A-20516) of the WPC-95 integrates two functions, audio and video, neither of which can be deactivated. We cannot replace only the audio part by putting an additional sound board (Tilt!Audio or Pinsound) in addition to the A/V board.
So, what is then usually recommended is to install a sound board (Tilt!Audio or Pinsound) and replace the A/V board with a simple video board (A-14039). Of course, you have to add a ribbon cable. This works... but not always why ?
Because the couple "Tilt!Audio (or Pinsound)" + "A-14039" is not 100% equivalent to an original A/V board (A-20516). Sometimes it works, and sometimes not.
Two examples, the first is the "Phantom Haus".
Ok, I admit it's a bit peculiar, but on this WPC-95 machine, the dot screen is 128x64 (and not 128x32). The A/V board can manage this resolution, while the simple video bord does not. We cannot therefore replace the A/V board with another one here.
The second, is the "CONGO".
This WPC-95 machine was also produced as a kit for WPC-S, with compatible eprom sets for both systems. But, as there is a separate fliptronic board in the WPC-S, the system must identify which hardware is used, and for that it looks at certain registers of the A/V board (which do not exist on the simple video board). This ways, at startup, the system identify on which hardware (WPC-95 or WPC-S) it is running. It's even more fun: there is some EPROM versions specific to original WPC-95 (that has been released before Williams introduce the WPC-S kit), that doesn't use this identification.
Depending on the EPROM version installed, sometimes the additional sound board doesn't works (not recognized as WPC-95). But if you try another version of EPROM, this time, the soundboard works... but unfortunately, the system being forced as WPC-95 (while it is a WPC-S kit) the fliptronic is not addressed (this function being integrated on the driver board. So, this time, the flippers doesn't work ! Strange, but true.
In this case, there is no solution for replacing the A/V board.
Technically: The ASIC of the WPC-95 A/V board contains specific functions and registers, which do not exist on a simple video board. It is sometimes used, as in the "Phantom Haus" and "CONGO", and sometimes not. So we can never say in advance that it will work.
Of course, there are people who have already done this for some WPC-95, and it works.