Exactly, one thing at a time. Once I get a good grasp and managed to deliver a working emulator, then I can start thinking about improving/optimize or even port

Exactly, one thing at a time. Once I get a good grasp and managed to deliver a working emulator, then I can start thinking about improving/optimize or even port it to another language. Right now I'm just trying to figure out the basic fundamental concept of "emulation" (what is it, what does it take, how can I write a simple one :)).