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socram8888 / tonyhax

PS1 savegame exploit
Do What The F*ck You Want To Public License
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Tomba! 2 - The Evil Swine Return (USA) and Other Anti-Modchip Games Trigger Protection #13

Closed AmuroRayMan closed 3 years ago

AmuroRayMan commented 3 years ago

On previous versions and the latest one (1.2.1) Tomba! 2 boots but triggers the anti-modchip protection. I'm not familiar with how the games detect modchips, I suppose since this is a softmod it has to be checking memory somewhere.

On an older version I also had this happen to Aconcagua (Japan). I have been able to boot both games on a softmodded PS2 via the PSX Launch program, so I don't believe they also have libcrypt but I am not entirely sure.

As with the last issue I opened, let me know if my BIOS version would help. It is one of the small white psone models (US).

socram8888 commented 3 years ago

libcrypt and antimodchip are two different beasts. The former requires properly writing the subchannel data to disc, which is doable. The later however checks for the presence and/or absence of the SCEx string, which is something that can't be replicated nor I can from tonyhax emulate.

tonyhax can't do anything regarding this, other than patching the game's executable on a case by case basis to disable it, something I am not against but would require considerable work.

socram8888 commented 3 years ago

Well that was easy. Tomba 2! booting is supported in d3b4930a919f420945dc311ddcb79e31048af4f8.

tonyhax will automagically patch this game at boot so that the antipiracy check is completely skipped.

EDIT: for the record, since this requires a per-game patch, if you find any other, please open a new ticket so I can keep track of which ones have been fixed and which haven't.

AmuroRayMan commented 3 years ago

Just wanted to say thanks for the quick fix and adding a framework in for other patches! I tested Tomba 2 a bit ago and it works great now.