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ac-nesrom-save-generator

Setup

Use pip to install dependencies:

$ pip install -r requirements.txt

Then install the script with:

$ python setup.py install

You may want to use a virtual environment for this.

ROM files

This tool can generate Animal Crossing save files that contain playable NES ROMs. To create a new file, provide the name of the game, the path to the ROM image, and the path to the output GCI file.

$ ac-nesrom-gen "Mega Man" "Mega Man (USA).szs" mega_man_nes.gci
Need 12 blocks to contain ROM GCI
Checksum: 0x00973e8e
Check byte: 0x72

The ROM image can optionally be compressed in "Yaz0" ("szs") format using a tool like wszstools.

Use a memory card manager to import the GCI file to a memory card, and then use the "NES Console" item to play the ROM.

If you're playing on Dolphin, disable anti-aliasing when playing NES games to get a better picture.

Patcher files

This tool can also be used to generate NES ROM files that contain patch tags. These tags can be used to patch code and data in memory.

Example usage of the patch options:

$ ac-nesrom-gen "Zuru2 Patch" /dev/null zuru_mode_2.gci -p 80206F9c 0000007D

Each -p/--patch option inserts a small ROM tag patch (251 bytes or less) within the address range 0x80000000 - 0x807FFFFF.

Larger patches, including code patches, can be inserted into the ROM data section. Use the --loader option to insert a patch loader that automatically loads big patches from the ROM data section, and supply the path to a patch file where the ROM file path would normally go.

$ ac-nesrom-gen --loader "printf" printf_c.patch printf_c.gci

If a patch only needs to run once upon loading, the --autoheader option can be used to generate a header for it automatically. It takes the load address of the patch as an argument.

$ ac-nesrom-gen --loader --autoheader 80002000 "Test" test.patch test.gci

See the ac-patch-loader repo for patch format and calling conventions.

Big patch generator

YAML files describing a series of big patches and settings can be used to generate the big patch section content automatically.

This example includes two patches. It uses a hex string to overwrite one instruction at 0x80404E24, and then loads a larger patch from the file debug_printf_c.patch to be inserted at 0x80002000.

settings:
    jut_console: false

patches:
  - target: 0x80404E24
    bytes: '4BBFD1DD'

  - target: 0x80002000
    file: debug_printf_c.patch

This example inserts a patch that will be called immediately after it's loaded to 0x80002000. It also enables the in-game debug console without requiring zuru mode to be enabled.

settings:
  jut_console: true

patches:
  - target: 0x80002000
    file: hello_osreport_c.patch
    flags:
      jump: true

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NES ROM Memory Card file creator for Animal Crossing

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