Hacking 2 byte (or more) codes in FCEUX

[Sanji Himura]

Game in Question: Romance of the Three Kingdoms (NES)

Scenario: I'm starting out in game scenario 1 (that is Jan. 189) with me controlling Cao Cao in State 7. When I first start out the game, I start out with 1200 gold and 20000 rice. It is these numbers that I am obviously concerned about. Since the value of these numbers are well over 255 (the maximum value for a one byte code), I can not use a known value search in the cheats menu.

This opens up two questions:

1. I know that this site has some RAW codes for the game in question, but I have no knowledge in how to get them to work with my game.

2. Is there any special techniques that is required for searching for 2 byte codes in FCEUX?

[Pyriel]

Not familiar with FCEUX, but if it really constrains searches to one byte only, you can always just search for the low-order bits of the value. 20,000 = 0x4E20, so search for 0x20 and look for the 4E in an adjacent byte. You could change the value and search again too, if you're looking for a RAM code. Add 100 rice and search for 0x84 or whatever.

I know NES codes are sort of primitive, but presumably you could write single bytes to adjacent addresses to modify the full value, if that's what you want to do. I don't know if that's actually doable. I don't remember any specific limitation that would prevent it, aside from not being able to do it in RAM with certain devices.

[Sanji Himura]

Not familiar with FCEUX, but if it really constrains searches to one byte only, you can always just search for the low-order bits of the value. 20,000 = 0x4E20, so search for 0x20 and look for the 4E in an adjacent byte. You could change the value and search again too, if you're looking for a RAM code. Add 100 rice and search for 0x84 or whatever.

I know NES codes are sort of primitive, but presumably you could write single bytes to adjacent addresses to modify the full value, if that's what you want to do. I don't know if that's actually doable. I don't remember any specific limitation that would prevent it, aside from not being able to do it in RAM with certain devices.

It does restrict known value searches to one byte. I had a bit of difficulty searching for State 7's horse value that took me, as someone who is inexperienced in hacking NES codes, a better part of a day to find a code that will work, but at this point, I'm willing to try anything.

EDIT: I just want to add in the code that I found for State 7's horses, if that helps:

7434:FF (original value code: 7434:42)

[lee4]

example
000073A8 05F5E0FF

should look like this on NES Emulstor
73A8 FF
73A9 E0
73AA F5
73AB 05