[Discussion] 60FPS patches for PSP games that run at 30FPS

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Anyone here could please give a guide on how to made a game speed modifier? I managed to get Fate Extra running at 60fps but as expected, it runs at double speed. I've already tried the trick on searching what floating values switch when I change fps but freezing them does not work. I don't know any MIPS but I found values in the disassembly such as zz_scedisplaygetframespersec, zz_scedisplaysetframbuf, zz_scedisplaysetmod, zz_scedisplaywaitvblankstart, and zz_scedisplaywaitvblankstartcb. Could anyone give me on some advice with getting the game modifier code to run properly at 60fps?