> > http://caps0ff.blogspot.de/2017/05/decap-139-replacement-mortal-kombat-4.html
> >
> > They used a Mortal Kombat 4 U76 PIC16C57 as a replacement for #139 Invasion U76
>
> In terms of emulation, what does this do for that particular game?
it will make the emulation slower.
really, these midway chips don't do much apart from provide a serial number for security and maybe on the later ones manage the backup ram, all of which is currently simulated, but if the PIC gets emulated that's another entire CPU that needs to run in the emulated environment.
they're not really protection as such, although on real hardware they did do enough to prevent romswaps, so they're most useful to owners of the pcbs where the chips have failed, in terms of emulation they're just there for completeness.
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Re: CAPS0ff: Decap #139 replacement: Mortal Kombat 4 U76
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