> Yes, I saw in some games have prot data, while others haven't.
> But they still have some rom patch in the driver init part:
>
> 5220 rom[(0x71275c^4)/4] = 0x60000000;
> 5221 rom[(0x71277c^4)/4] = 0x60000000;
>
> I'm not familiar with PowerPC assembly code. Are these patch for some kind of
> protection?
0x60000000 = NOP 
But no, those are not protection patches. The protection is emulated, but missing the return values in non-trivial cases (VON2/Dirt Devils tilemaps, Daytona 2 code piece).
What those patches do, is to skip some interrupt-related loop that noone ever bothered to figure out.
|
Index 
Flat 
Re: Model-3 interface board & stepping compatibility?
Reply
