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Super Mario 64 Nintendo 3DS Port Controller Remapping Guide

This document describes how to remap controls for SM643DS using the sm64config.txt configuration file.

This online editor from BenoitCaron is usable, but it does not support remapping of all buttons.

Caveats and Limitations

  • All of the N64 and 3DS buttons are available to remap except for the N64 Analog Stick and 3DS Circle Pad, as their mapping is hard-coded.
  • Only the Player 1 controller can be used.
  • On older versions of the 3DS port, and also currently on the PC port, the N64 D-Pad was not mappable, as the vanilla game only uses it for debug controls. This port allows mapping the N64 D-Pad, so ensure that your version is up-to-date if you wish to use it.

How to Find sm64config.txt

Run the game once and search your SD card for sm64config.txt.

  • When running from a 3DSX, it should appear next to the 3DSX file.
  • When running from an installed CIA file, it should appear in your SD card's root.
  • When launching remotely via 3DSLink, it should appear in your SD card's root.

How to Edit sm64config.txt

Inside of sm64config.txt, you will find various key_ variables, followed by a number, and separated by a space. The key_ variables represent the N64 controller's inputs, and the number represents the 3DS's inputs.

Every available 3DS input is represented by a single bit in a binary number. For example, A is the first bit, and B is the second bit. The full list can be found below. However, these numbers are stored in sm64config.txt as decimal numbers, which is why they may look nonsensical.

To map a button, simply copy the button code from the definitions below into your sm64config.txt, replacing the existing number for that key_ input.

To unmap a button, replace its button code with a 0.

Mapping Multiple 3DS Buttons to One N64 Button

Mapping multiple 3DS buttons to one N64 button requires mathematically adding each button code.

For example, to map the N64 Z Button to both the 3DS L Button and the 3DS R button, do as follows:

3DS L Button: 512
3DS R Button: 256

512 + 256 = 768

Then, write key_z 768 to sm64config.txt, replacing the existing value if required.

3DS Button Definitions

The following 3DS buttons are supported by SM643DS.

    Code        3DS Button
─────────────┬────────────────
         1   │    A Button
         2   │    B Button
         4   │    Select Button
         8   │    Start Button
        16   │    D-Pad Right
        32   │    D-Pad Left
        64   │    D-Pad Up
       128   │    D-Pad Down
       256   │    R Button
       512   │    L Button
      1024   │    X Button
      2048   │    Y Button
     16384   │    ZL Button (New 3DS only)
     32768   │    ZR Button (New 3DS only)
  16777216   │    C-Stick Right (New 3DS only)
  33554432   │    C-Stick Left (New 3DS only)
  67108864   │    C-Stick Up (New 3DS only)
 134217728   │    C-Stick Down (New 3DS only)

Notes

  • The 3DS Circle Pad can actually be bound to N64 buttons, but it cannot be unbound from the N64 Analog Stick from within sm64config.txt, so its codes were omitted here.
  • The Touch Screen's virtual buttons cannot currently be edited.
  • When running on the Old 3DS, mapping buttons only present on the New 3DS is harmless.
  • If duplicate config entries exist in sm64config.txt, the last entry will be the only one used.