A few times in the past few days at work, at lunch a few of us were reminiscing about our old 8-bit Ataris and some of the old games. I have a fondness for those Atari machines as that’s where I first learned to program (you can see some of my early creations here).
I looked for an Atari emulator for Mac OS X and found a great one called Atari800MacX.
It took a little while to remember how to use the Atari and DOS and BASIC, but it came back pretty fast, especially after picking up lots of pointers from The Atari 8-bit New User, Emulator Help FAQ.