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英雄伝説 閃の軌跡I：改 -THORS MILITARY ACADEMY 1204-

The Legend of Heroes: Trails of Cold Steel (Sen on Kiseki) Kai -THORS MILITARY ACADEMY 1204-

Game info

TitleID: 0100AD0014AB4000
Explanation based on:

  • Internal version: 1.0.3,
  • Nintendo version ID: v3/v196608
  • BID: AC8C8EC9DB1A8EF4
  • Engine: Heavily modified Phyre engine

Details

Game is using internal FPS locker. We need to patch it.
WARNING: Game has issues with slow-motion cutscenes when FPS is set above 30 FPS. It will make them up to several times longer than they should. Use Turbo mode when that happens.

How to find offsets

We need to use disassembler in this case.

After finishing disassembling main we need to find those bytes:

21 00 23 1E 00 10 2E 1E 00 18 21 1E

It should return a function that looks something like this:

.text:0000007100022CA0 sub_7100022CA0                          ; CODE XREF: sub_7100127780+90↓j
.text:0000007100022CA0                                         ; sub_7100127780+158↓p ...
.text:0000007100022CA0                 UCVTF           S1, W1
.text:0000007100022CA4                 FMOV            S0, #1.0
.text:0000007100022CA8                 FDIV            S0, S0, S1
.text:0000007100022CAC                 ADRP            X8, #dword_710080C9F0@PAGE
.text:0000007100022CB0                 CMP             W1, #0x3C
.text:0000007100022CB4                 STR             S0, [X8,#dword_710080C9F0@PAGEOFF]
.text:0000007100022CB8                 MOV             W8, #0x1E
.text:0000007100022CBC                 CSEL            W8, W1, W8, EQ
.text:0000007100022CC0                 STR             W8, [X0,#0x40]
.text:0000007100022CC4                 RET
.text:0000007100022CC4 ; End of function sub_7100022CA0

dword_710080C9F0 is our pointer where it's stored frame time in seconds that is used as FPS lock.

So for 15 FPS it will look like this:

15FPS:
  -
    type: write
    address: [MAIN, 0x80C9F0]
    value_type: float
    value: 0.06666666666
  -
    type: block
    what: timing

For 30 FPS like this:

30FPS:
  -
    type: write
    address: [MAIN, 0x80C9F0]
    value_type: float
    value: 0.03333333333