We recommend that you use Subversion to help you keep your bundle up to date with minimal effort. Make sure you have Subversion installed (if you have Xcode installed you already have it), close TextMate, then open Terminal and run the following commands (be sure to pay attention to the backslash escapes):
cd ~/Library/Application\ Support/TextMate/Bundles/
svn co https://sparcasm.svn.sourceforge.net/svnroot/sparcasm/trunk/SPARC\Assembly.tmbundle SPARC\ Assembly.tmbundle
Launch TextMate and the bundle should appear automatically. To update the bundle to the latest version, close TextMate, then run the following commands:
cd ~/Library/Application\ Support/TextMate/Bundles/Sparc\ Assembly.tmbundle
svn update
Alternatively, you can download the bundle here; however, you'll have to keep it up to date manually.
This bundle works best on TextMate, but even if you're not using TextMate, and even if you don't have a Mac, you can still use this tool. On Windows, you can use the E Text Editor, and on any platform, you can use the free, open-source Redcar editor. Both support TextMate bundles, but only TextMate supports all the features, including code folding.
If you have any questions, please see the support page.