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Atari 2600 Game Programming
Once you have some proficiency in coding 6502 Assembly Language, you are ready to take on coding games for the Atari 2600. Here are some resources to help you.
Racing the Beam
"Racing the Beam" is an excellent text on the in's and out's of writing games on the Atari 2600. Check it out at Amazon
Get Your Geek On
If you are a hardcore geek, then get your geek on with the "Stella Programmer's Guide". This is a very detailed technical manual for coding on this platfrom. Check it out here. If you can digest information at this level, everything you want is here.
Study the Samples
The code samples should help you to ramp up your learning curve. Check them out here