Humm, I don't get what you mean. Why it has to be Historic?! In any event, that site link is good, but old news, and its AVR, not Arduino. 
In any event, I'm not trying to do something like that, I'm just creating my own 8-bit rompler and felt like sharing the code I got so far, which is Arduino compatible. 
Wk
I was in a class so I couldn't write a lot.
The example that I gave is a bit overkill as it is done in assembly, but someone said that its historic, and I dont agree with that.
But I take my hat off to you sir, great coding that is going there
I love 8bit/retro sounds, and I plan to make something like that, so keep up the good work William, and I hope you the best with your awesome Beat707, a trully professional work being done by you!