Tileset Header Editing

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Tileset Repointing Tutorial for Pokémon Gold and Silver
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Written by Mateo



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Purpose for writing
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To explain to people how you go about repointing and editing

tilesets in Gold and Silver (I assume its the same for Crystal,

also, but I don't hack crystal, so go figure)

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Difficulty Level
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Medium, Need basic understanding of Hex Editor and

Pointers

***************
Getting Started
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What you will need:

Pokémon Gold or Silver Version ROM (US English)
Hex Editor (i.e.- Hex Workshop)
Calculator (Windows CALC.EXE)
Pointer Calculator (Take your pick)
Tile Editor (TLP will be used in this tuorial)
Goldmap 1.6

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Repointing the Graphics
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*******
Step #1
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Ok, the first step is to open your rom in TLP and find Tileset

#1(Outside tileset). You then using plus and minus keys at the

top of the keyboard, have it so it is showing the top row of tiles

right, then lower it by so the colors are right but there is one

little row of what looks like garbage at the top of the first tile.

now copy the whole tileset and paste it into a blank space in

the rom. make you sure you have the tileset GFX, plus the two

bytes before and after the GFX themselves.

EDIT: Since this is probably still confusing, to make it easier I have uploaded this:
A blank tileset image you can just import in TLP at the offset you want to point to, and draw your tiles over the blank ones (using + and - keys to leave the random black and red pixel lines where they are)



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Step #2
*******

You now draw or paste your tiles over the existing ones in the

tileset(the one you just pasted in the blank space). After you

are done with that, save the rom. Write down the offset of the

2 bytes before the GFX started. You will need it later.

*******
Step #3
*******

Now, open your Rom in a Hex Editor, such as Hex Workshop.

Now, I will explain to you exactly what you need to do, so if you

are not familiar with hex you should still be able to do this

step. Now, while keeping the hex editor open, open your

calculator and figure up the following equation to find what

offset to go to: 156BE + (F * Tileset #) so if you were making

a replacement for tileset 4 (the houses in cherry grove) you

would set it to scientific mode, click over to hex, and type (F)

(x) (4) (+) (1) (5) (6) (B) (E) (=). that would tell you the offset

where Tileset #4's header starts. now, when you get there, the

data is stored in this manner: [Graphics Ptr, 3 byte] [Block

Data Ptr, 3 byte] [Collision/Effect data ptr, 3 byte] [Animation

Ptr, 2 byte] [Unused (00 00), 2 byte] [Palette Data Ptr, 2 byte.

Animation data is always bank 3F, Palettes are always bank

02.

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Step #4
*******

Open your pointer calculator and calculate a 3-byte pointer to

the offset where you saved the GFX(remember, the offset I

told you to write down). Now in your hex editor, while at the

offset of the header, type the pointer over the first 3 bytes of

the tileset header. Now save your Rom, and if all went

correctly it should be done.


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Repointing the Block Data
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This part is fairly simple if you follow directions.

*******
Step #1
*******

Ok, first step is to find a good stretch of blank space in the

rom. It can be in any bank(also this step is only necessary if

you wish to add more blocks than the original tileset had to

begin with).

*******
Step #2
*******

Next, Open up your pointer calculator and calculate a 3 byte

pointer to the blank space you found. Using the formula

above, find the header and insert this pointer over the old one.

*******
Step #3
*******

Now that it is repointed, open up Goldmap 1.6 and load a

map with your tileset. You will see everything is blank. Now

what you do is go through and simply make every block you

want. Long process, but its the only way to do it. Save and

your block data is set up!


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Editing Collision Data
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This is very similar to editing block data. Repoint to a stretch

of blank space, then type in the collision/effect data manually.

Collision data for each block is 4 Bytes long, in the order of

Upper Left, Upper Right, Bottom Left, Bottom Right. See the

attatched list of collision/effect data for which values to use.

Collision/Effect Data:


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Editing Palette Data
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There is no need to repoint, as this is always the same size.

Simply follow the pointer in the header, which you calculate

using the formula above.

Data is stored as follows:
The data is simply a list of which pallete colour for each tile

stored in order. Each pallete is half a byte, stored backwards.

for example, if the first 2 pallets in the tileset are "0" and then

"3", the byte would be "30" and so on. A list of Pallet numbers

follows:

0 = grey
1 = red/pink
2 = green
3 = water color (blue)
4 = orange
5 = brown
6 = roof color

Once you have your pallet allocations set up, you can test it by

loading it in Goldmap again. That is the beauty of Goldmap

1.6: Everything read from the rom.

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Animation Data
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Unfortunately, at this time I do not have a full list of what goes

here. All I can say is, find a tileset with the animations you like,

such as Tileset 1 if you want whirlpool, tileset 2 or 3 if you just

want Flowers and water, and so on, and copy its pointer.

Once I compile a list of them, they will be included in here as

well.

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Credits and such
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Credits go out to Hyper Hacker for info on header setup,
Coolboyman for his info on all the tile effects,
Jigglypuff for making Goldmap 1.6, and Momma for buying
this laptop, without it I wouldnt be sitting here typing this mofo
right now ^_^.

Colossians 3:23-24
Whatever you do, work heartily, as for the Lord and not for
men, knowing that from the Lord you will receive the
inheritance as your reward.