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While we're on the topic of hacking GB Zelda, is there any emulator like FCEUXD features with like a live ROM editor for Gameboy?

I always wanted to experiment on those games like that.

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Posted by Jigglysaint

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Well I've been hacking gameboy Zeldas again. This time though, instead of releasing a patch for people to have fun with, I thought I'd just post a thread on how to change the rom to give people a little somthing to play with.

Basically, it's a minihack to allow Link to use the Harp of Ages anywhere in the game. The first song is still limited to portals, but with the Tune of Ages, you can warp anywhere. Outside, inside houses, dungeons, and even underwater. Link still swims underwater, except now he "walks" rather than swims. What I mean is that for the screens that are submerged, like the sea and level 7 and parts of levels 6 and 8, you don't use the mermaid suit controls. You walk normally, except you are still in your suit. Most other effects of water are still there, including the button layout. However, now you can use the feather, boomerang, and harp.

To change that value so that Link can use more items underwater, change 14022 in an US AGES rom from $40 to $00. This is a bit check to see if you are underwater, and if you are, to add the mermaid suit controls. You still have the controls for side view areas, and for water tiles.

The other two bytes allows the unconditional usage of the harp anywhere in the game. However before I give the location, there are a few things to remember: The game was not programmed for the harp to be used in dungeon rooms, so sometimes a bug occures when you warp. If you are near the bottom of the screen, there is a chance that when you warp, you will get stuck in an invisible wall and warp back. You will then continue to play 4th dimention ping-pong for eternity and you need to restore a save state. The second problem is that if you warp over a pit or anything similar(like deep water before getting the mermaid suit), you will get stuck and keep falling in untill you die. The third problem is that if you play a song while stuck in a wall, and the other side also has a wall, you will get a poblem just like the first bug. Finally, when you warp in dungeons, sometimes the graphics are messed up, and you see blocks that arn't really there. This is purely cosmetic, and will go away when you leave the screen.

The values to time travel anywhere are at 18E1E and 18E1F The first byte is $7E, and you change it to $FF. The second byte is $20 and you change it to $28. If you know Z80, you should also be able to NOP out the branch. Basically you are trying to tell the game never to branch, because the branch means you can't warp.

So have fun, and for goodness sakes if you want to code an editor for either game, see me because I've got this game all figured out pretty much.

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