Do you still want to program for the 486 or are you looking to program using a more modern environment? If you are going to program for a modern platform, which one would you like to target? No matter which platform you choose you will probably want to use OpenGL. For that I recommend http://nehe.gamedev.net. If you want to develop for Mac OS X then I recommend http://www.idevgames.com and in particular http://www.idevgames.com/forum/showthread.php?t=11896.