1/20/2024 0 Comments Dino crisis ps1 inside cover ntscv1.2.2 will have automatic patching of certain games with antimodchip - YuGiOh Forbidden Memories is one of them. When using the "secret unlock" it only unlocks read/n read/s capability of unlicensed discs, but GetID still identifies such a disc as unlicensed.Įither that, or the test command 19h,04h "Read SCEx string (and force motor on)" fails, perhaps it does fail if the internal licence counter is "unlicensed" in the first place, and the antimod code does not expect this command to fail and triggers the block screen anyway by default.Įither way, I don't think there's a way around this other than patching the antimod code in the game itself (as mentioned above). I have a feeling the antimod code is also checking the licence state first with the GetID command. at a position where the wobble check should fail), and – if the wobble check succeeds – then the game determines that the PS1 must have a modchip installed (the later ‘stealth’ modchips attempted to circumvent this issue by switching themselves after a few seconds). ![]() Interesting… I might be wrong, but I remember reading years ago that the anti-modchip code supposedly works by asking the CD drive to read the wobble code whilst the laser is positioned over one of the regular data sectors (i.e. If the names don't match, then the game displays an error and refuses to load the save file. The locations may vary for different regions of the game.ĮDIT/UPDATE: The checksum value for WWF SmackDown! (1) may be at location 0x10B7 as this value also changed whenever the in-game options were changed, and the checksum values for Dead or Alive might be at locations 0x27E, 0x27F, 0x492, 0x4FE, and 0x4FFįURTHER EDIT/UPDATE: It seems that the custom wrestler names actually appear twice in the WWF SmackDown! save file as long as the two match, then it's possible to modify the name strings without having to adjust any checksum values. I have performed a quick check, and I believe that the checksum offset locations for WWF SmackDown! 2: Know Your Role may be at 0x1A84 and 0x42FC (relative to the “SC†string at the beginning of the save file), as these bytes also changed when I adjusted one of the custom wrestler text slogans in the game. I think that the white mini-PSone performed a similar region check upon booting (which later modchips bypassed), but I’m not sure whether any software did so during the game itself in order to defeat the older grey PS1 machines.īy the way: I have done some more investigation, and I think that Dead or Alive, WWF SmackDown!, and WWF SmackDown! 2: Know Your Role all potentially contain checksum values, as they all refuse to load memory card save files where the strings have been changed by even a single byte. I’m also not sure what effect (if any) the tonyhax ‘drive unlock’ code would have on unpatched CD-R copies of games such as MediEvil (and Spyro 2/3 ?), which supposedly performed in-game wobble or sector checks of some description in order to detect copied discs? I’m not entirely sure how this protection worked, or varied from the anti-modchip detection code.Īlso: I’m not sure if any games ever compared the region code in the BIOS to the region code on the disc (not the wobble code, but the licence string / boot filename), but – if so – then I’m assuming that such a game would be impossible to boot on an unmodified foreign machine without patching. ![]() Perhaps the ‘drive unlock’ code in the tonyhax exploit causes the wobble check to always succeed (even during the anti-modchip check), which is why this error message is being displayed? I’m not sure. at a position where the wobble check should fail), and – if the wobble check succeeds – then the game determines that the PS1 must have a modchip installed (the later ‘stealth’ modchips attempted to circumvent this issue by switching themselves off after a few seconds). ![]() I came across this video of someone testing Yugioh Forbidden Memories with tonyhax v1.2.1 and it got the Anti Piracy message.
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