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Calico

Calico is a port of the Atari Jaguar DOOM codebase back to the PC, aiming to support playing the game in its original form on that console with a minimum number of required changes. It accepts either the game's ROM file or the extracted jagdoom.wad file from inside it. You will need a backup device for Jaguar ROM cartridges in order to legally play the game.

I have undertaken reverse engineering of the GAS assembly files for the renderer, which are written in a custom assembly language understood only by the custom Tom and Jerry ASICs on the Jaguar motherboard. Gameplay GAS files were additionally verified by cross-referencing against the 3DO source code and the Doom64 EX project, both of which share about 99% of that code but already in a C form.

Calico is named in honor of my late cat, Nikki Fritz, who was a calico tabby mix, because it is a "little kitty" of a Doom port.

How to Use

After unpacking the binary build, either add a doom.jag Jaguar ROM file or jagdoom.wad to the same directory and simply double-click the executable file to start.

You can also identify the file to use by using the -iwad command-line parameter, which works the same as for most other source ports. By using this, you can have the file be located wherever you wish and it can be named whatever you want.

Note that any uncompressed Jaguar ROM format should be supported, but only files named doom.jag will currently be autodetected. The format of the file will be detected at runtime and is not dependent on the name of the file.

The configuration file and emulated EEPROM storage are written to a writeable area of your user directory, which depends on the operating system in use. For Microsoft Windows, this will be a path of the form C:\Users\<username>\AppData\Roaming\Team Eternity\Calico

Default Controls

Keyboard, mouse, and gamepad input are fully supported. The default controls, which can be rebound via the configuration file or using the calico-config utility, are as follows:

Keyboard

It is possible to use an authentic control scheme by binding the Jaguar A, B, and C button actions to keys. When using this control style, strafe and use are not separate. Use the calico-config utility to bind these keys if desired.

Mouse

Gamepad

Note: Any device which is recognized by SDL as a game controller can be used. Game controllers operate on an Xbox-style abstraction which maps buttons and axes to the layout of an XInput-compatible controller. For best experience, use a controller with at least four face buttons, four shoulder triggers, a directional control pad, and at least one analog stick. Choose and configure your device using the calico-config utility.

Command-line Parameters

Credits

License

All original code, as well as code derived from the 3DO source code, is available under the MIT license. Code taken from Jaguar DOOM is still under the original license for that release, which is unfortunately not compatible with free software licenses (if a source file does not have a license header stating otherwise, then it is covered by the Jaguar Doom source license).

The calico-config utility is available under the terms of the GNU General Public License.

Changes

Calico v2.0 contains the following new features and fixes:

Known Issues

This program is in development, so some things are not finished or have known issues: