Remember that the ROM is only one part. In order to use this 0926 – Phoenix Wright – Ace Attorney Justice For All ROM you will need to download a Nintendo DS emulator. There are emulators for different platforms like Windows, Android, iOS and Mac OS X.

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The general architecture for PyWright, is a set of art assets, an interpreter/engine to run the games (which are written in a scripting language designed specifically for this type of game), and an update program to download more art, other people's games, or updates to the engine.
A game consists of a folder which contains 'cases' or chapter folders; and the actual scripts and unique content are placed in these folders.
The engine contains many features, such as textboxes, lipsynced characters (lipsynced to the printing text, not to voiceover), special effects, logic, and the various engine features from the Ace Attorney games. It can be run in software or hardware rendering (using pygame or pyopengl respectively), in dual screen mode (emulating a DS) or single screen mode, as well as different resolutions.
The scripting language has evolved considerably since it was originally designed, although it hasn't fundamentally changed much. It will likely remain 99% backward compatible from this point on. The syntax is fairly simple - one command per line, with commands supporting different numbers of arguments. It feels somewhat like BASIC (including the use of GOTO), but with a few borrowed elements from other languages. It's not meant to be a general purpose language.
Requirements to run source:
pygame
numpy
On Windows, the windows exe version should work fine. On linux, the dependancies shouldn't be too hard to track down. On Mac, it is recommended to not go with system python but instead to use the mac port of python2.5 from this link: http://pythonmac.org/packages/py25-fat/ and the pygame package for python2.5 found on pygame.org. (A mac py2app port is available as well).