I would love nothing more than to play Defender or Yar's Revenge, but I can't bring myself to execute arbitrary binaries downloaded off the internet. Any safe place where one can download or buy roms? If whoever owns Atari now were smart, they'd sell them through a legitimate online marketplace so we could safely run them on very nice 2600 emulators like this one.
EDIT: Found an answer, waking up half my family in the process (Yar's revenge is not a low-volume game). Atari does, in fact, both sell and offer some of their old 2600 games for free:
http://atari.com/arcade/arcade/yars-revenge
So, uh, you're afraid that someone has introduced malware in Atari 2600 machine code, that can break out of any arbitrary emulator and do Real Damage to a hosting system, and hidden that in what appear to be vintage game ROMs on the Internet?
That's true, I run XP on virtualbox (linux host) almost every day, and could just make a throw-away copy with no network access. I'm embarrassed I didn't think of that.
Virtual machines can be insecure if they contain bugs. When it comes to providing a secure execution environment, I trust Virtualbox more than I trust any JVM, most of which I trust more than I trust any console emulator.
Awesome interface! You have to find your own ROM files to play, but its easy... Just drag and drop ROM links from websites directly over the screen and BAM!
EDIT: Found an answer, waking up half my family in the process (Yar's revenge is not a low-volume game). Atari does, in fact, both sell and offer some of their old 2600 games for free: http://atari.com/arcade/arcade/yars-revenge