> > I'm hoping for a decap on that Namco C139 because the contents on that chip aren't > > known (unless someone can confirm). I think it's an MCU because of how responsive > > that controller is (tested it with Cyber Cycles, Time Crisis 2 and Motocross Go). > > Would be nice to see a non Sega game with networking emulated. > > The Final Lap schematics suggest C139 is a full-fledged ASIC or else some really > offbeat DSP (host data is 13 bits wide). The signal names used there suggest that > it's implementing something approximating a token ring protocol. The chip has Fujitsu > markings, which is not a good sign.
I'm pretty sure it's used for player board comms on Galaxian 3 too btw, which has *9* of them on one of the PCBs.
If we do start to see progress with the Laserdisc stuff that's definitely going to be an issue (although it's not even 100% sure due to the hardware, even without 2 laserdiscs running in sync and having to be decoded at the same time)