Those new values are then locked in place, and can't be modified. When you input your code, it's setting a flag in memory that says, for example, "when you read the memory address for how many lives are left, do 99 instead of 3". edit: The GameShark's system isn't arbitrary code execution. I just don't get a chance to debate this kind of thing very often. I'm sorry if any of this comes off as me being a jerk, please understand I'm not trying to be. This also has the added benefit of guaranteeing 100% compatibility across every PSX hardware revision. It's duplicating the playstation's normal security mechanisms and using them as intended. This isn't a *software* hack, but a physical hardware one. The playstation would then see the GameShark disc as 100% legit, and would execute whatever code came next. Ever seen that movie cliche where they cut the guy's thumb off and use it to access a security door? It's exactly like that.īasically, InterAct physically cloned the lockout information onto a new disc and wrote their program around it. The disc itself was designed to be compatible with Sony's "wobble groove" lockout system. There's no way to access it without a disc, which leads to my next point. In fact, if you put it in at the PS memory card menu, it doesn't even show up. The gameshark cdx's dongle was only there for code storage.
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