Based off of Lighnat0r's mouse sensitivity reset script, but modified to be specifically for VC and includes y-axis sensitivity fix functionality. Now also includes a nasty game fix which means that you can get blood etc. even on French/German locales. This is the only mouse fix permitted for Vice City speedruns that are to be submitted to the speedrun.com leaderboards as of 2023-04-29

Comes as an ASI file. Just put this into your VC directory and play.

You should probably just use the ASI so you don't need to open another program, but below are previous versions which do exactly the same thing.

• Version 1.03 - Normal AHK version. No window, just sits as a low-key icon in your task area.
• Version 2.02 - C program with console output which logs status and session attempt count.

This works by overwriting the command(s) which set mouse sensitivity upon new game with NOPs, which makes nothing happen instead.

• For Retail 1.0/1.1, 0x90 is written to addresses 0x0046F4B1 - 0x0046F4BA
• For Steam/Green Pepper, 0x90 is written to addresses 0x0046F391 - 0x0046F39A
• For JP, 0x90 is written to addresses 0x0046F821 - 0x0046F82A

This works by patching 5 different memory addresses that each have to do with the y-axis sensitivity in some fashion:

• Sniper rifle first-person aim sensitivity
• RPG first-person aim sensitivity
• M4/Ruger/M60 first-person aim sensitivity
• Normal free aim
• Something called "runabout" which may have to do with classic controls.

The addresses noted below will be provided in the above order.

• For Retail 1.0 [1.1], the value 0x94DBD0 [0x94DBD8] is written to addresses 0x004796F2, 0x0047A48D, 0x0047AFF5, 0x0047C0BF, and 0x00481FB3.
• For Steam/Green Pepper, the value 0x94CBD8 is written to addresses 0x004795D2, 0x0047A36D, 0x0047AED5, 0x0047BF9F, and 0x00481E93.
• For JP, the value 0x94ABD8 is written to addresses 0x00479AC9, 0x0047A864, 0x0047B3CC, 0x0047C496, and 0x0048238A.

This simply enables "nastyGame" so long as the initial game language is not French nor German.

• For Retail 1.0/1.1, 1 is written to address 0x68DD68
• For Steam/Green Pepper, 1 is written to address 0x68CD68
• For JP, 1 is written to address 0x68B110.

All memory addresses, values to write, and the memory read/write code are taken from Lighnat0r's scripts (the mouse sens reset script, and the y-axis fix ASI which this is a fork of; the mouse sens reset fix didn't have its own repo). Lighnat0r's original y-sens fix ASI and the CPatch.h header was used as a base for my ASI version. Technical explanation of the addresses' functions graciously provided by Nick007J. Mouse icon within the program icon taken from Freepik on Flaticon