Originally posted by NetSplit

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Well, what exactly do you want to know? Are you aiming to edit, say, the actual game code (the assembly code) in the game, or what? If you intend to edit the assembly (ASM), then Vagla's document probably won't help you, since it doesn't go into that. What you should do is grab FCEUXD SP, an emulator that has all sorts of debugging features that are incredibly important to hacking ASM and other aspects of NES games. You should also pick up this reference document that contains a ton of useful information about the 6502 opcodes (commands). Furthermore, there are some really simple ASM tutorials done by someone (though I can't remember who) that I can't currently find, but I never liked them all that much anyway because they taught a few bad habits, if I recall correctly. Meh. Parasyte did write some tutorials for FCEUd (the first FCEU debugger, off of which FCEUXD and FCEUXD SP were built) that you may find useful, but they might also be too advanced for you. Dunno.

Any chance you could clarify?

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