NES CD ROM hack questions

[Ryan Davis]

Okay, I am interested in doing this.
I am thinking of buying a used computer and uploading the needed stuff and using that PC solely for the purpose of modifying 8 bit NES games.

I would rather not connect it to the internet, I would rather use moveable storages into and out of it. But connecting it once or twice to get what is needed may have to happen.

Problem being is, I don't really know exactly where to start.
After viewing this site I realized it can be done relatively easy.

What would I need in that beat up old used machine to be able to carry through with this diabolical plan of NES hijacking? What would be the requirements of such a machine?

If possible I want to modify versions of the original Legend of Zelda.
Ending with a product that is either only playable on a PC or if possible on a NES console, whatever may be.