Difference between revisions of "SCHG:Sonic the Hedgehog 3 & Knuckles"

Revision as of 01:47, 5 May 2007

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Note: As S3&K is a "lock-on" game, all offsets below $200000 are in the base S&K ROM, and all offsets above $200000 are in the connected S3 ROM.

ROM Hacking

Art Editing

Uncompressed Art Locations

Nemesis Compressed Art Locations

Kosinski Compressed Art Locations

Palette Editing

Usually, it's not really necessary to edit a palette in hex. Palette editors give you instant feedback for each RGB value, and the palette can be easily saved as a separate binary and reimported into the ROM. However, it is sometimes desirable or necessary to do it in hex, and it can't hurt to know how it's done.

These are the ROM offsets of the palettes in Sonic 3 and Knuckles, as listed by HivePal:

Offset	Name
291A	Angel Island Act 1 Cycle #1
293A	Angel Island Act 1 Cycle #2
29BA	Angel Island Act 1 Cycle #3
2A1A	Angel Island Act 1 Cycle #4
2A4A	Angel Island Act 2 Cycle #1
2A6A	Angel Island Act 2 Cycle #2
2A9A	Angel Island Act 2 Cycle #3
2ACA	Angel Island Act 2 Cycle #4
2B32	Hydrocity Act 1 Cycle
2B52	Carnival Night Cycle #1
2BB2	Carnival Night Cycle #2
2C32	Carnival Night Cycle #3
2C66	Carnival Night Cycle #4
2CA6	Carnival Night Cycle #5
2D06	Carnival Night Cycle #6
2D86	Carnival Night Cycle #7
2DFA	Icecap Cycle #1
2E3A	Icecap Cycle #2
2E82	Icecap Cycle #3
2E9A	Icecap Cycle #4
2EDA	Launch Base Act 1 Cycle
2EEC	Launch Base Act 2 Cycle
2EFE	Lost Level 09 Act 1 Cycle #1
2F7E	Lost Level 09 Act 1 Cycle #2
2FA2	2P Level - Balloon Park Cycle #1
2FB4	2P Level - Balloon Park Cycle #2
3032	2P Level - Desert Palace Cycle
3082	2P Level - Endless Mine Cycle #1
30BE	2P Level - Endless Mine Cycle #2
31C2	Super Sonic
31FE	Super Sonic Underwater
323A	Super Sonic Underwater
3C78	Sega Logo #1
3CF8	Sega Logo #2
3D08	Intro Frame #1
3D48	Intro Frame #2
3D88	Intro Frame #3
3DC8	Intro Frame #4
3E08	Intro Frame #5
3E48	Intro Frame #6
3E88	Title Screen
3FD4	Title Screen Cycle
5092	2P Level - Knuckles
70BC	Level Select Menu - EHZ Icon
70DC	Level Select Menu - MZ Icon
70FC	Level Select Menu - HTZ Icon
711C	Level Select Menu - HPZ Icon
713C	Level Select Menu - OOZ Icon
715C	Level Select Menu - MCZ Icon
717C	Level Select Menu - CNZ Icon
719C	Level Select Menu - CPZ Icon
71BC	Level Select Menu - ARZ Icon
71DC	Level Select Menu - SCZ Icon
71FC	Level Select Menu - WFZ Icon
721C	Level Select Menu - DEZ Icon
723C	Level Select Menu - Special Stage Icon
725C	Level Select Menu - X Icon
727C	Level Select Menu - Sound Test Icon
7A26	Special Stage - Sonic and Tails
7A66	Special Stages
7AA6	Special Stage 1
7ACC	Special Stage 2
7AF2	Special Stage 3
7B18	Special Stage 4
7B3E	Special Stage 5
7B64	Special Stage 6
7B8A	Special Stage 7
7BB0	Special Stage 8
A55E	2P Menu - Sonic and Tails
A57E	2P Menu - Knuckles
A59E	2P Menu - Unselected Portraits
A5BE	2P Menu - ALZ Portrait
A5DE	2P Menu - BPZ Portrait
A5FE	2P Menu - CGZ Portrait
A61E	2P Menu - DPZ Portrait
A63E	2P Menu - EMZ Portrait
BBB6	Data Select - Sonic/Tails/Knuckles/Emeralds
BBF6	Data Select - Sonic Portrait
BC16	Data Select - Super Sonic Portrait
BC36	Data Select - AIZ Portrait
BC56	Data Select - HCZ Portrait
BC76	Data Select - MGZ Portrait
BC96	Data Select - CNZ Portrait
BCB6	Data Select - FBZ Portrait (Unused)
BCD6	Data Select - ICZ Portrait
BCF6	Data Select - LBZ Portrait
236AC	Red Balls Debug Mode Item
2D3BE	Special Stage Results
4160A	Ending - Credits
4168A	Ending - Knuckles and Eggman
457AE	Knuckles
457CE	###
4580E	Carnival Night Lights Off
45E86	Angel Island Act 1 Intro - Emeralds
47092	Angel Island Act 1 Boss
47CD6	Angel Island Act 2 Boss
48C9A	Hydrocity Act 1 Boss
49D52	Hydrocity Act 2 Boss
4B588	Marble Garden Act 2 Boss
4BF70	Carnival Night Act 1 Boss
4C91E	Carnival Night Act 2 Boss
4D520	Flying Battery Act 1 Boss
4DB80	Flying Battery Act 2 Boss
4EBC2	Icecap Act 2 Boss
4F444	Icecap Act 1 Boss
4F98C	Launch Base Act 1 Boss
503EE	Launch Base Act 2 Triplet Boss
50C8A	Launch Base Act 2 Cannonball Boss
520DC	Launch Base Act 2 Final Boss
5211C	Ending - Sonic
5213C	Ending - Tails
5215C	Ending - Super Sonic
8C234	Sonic and Tails
8C274	Level Select Menu
8C314	Angel Island Act 1
8C374	Angel Island Act 1 Intro
8C3D4	Angel Island Act 2
8C494	Angel Island Act 1 Underwater
8C434	Angel Island Act 2 FBZ Sequence
8C514	Angel Island Act 2 Underwater
8C594	Hydrocity Act 1
8C654	Hydrocity Act 1 Underwater
8C5F4	Hydrocity Act 2
8C6D4	Hydrocity Act 2 Underwater
8C754	Marble Garden
8C7B4	Carnival Night
8C814	Carnival Night Underwater
8C894	Icecap Act 1
8C8F4	Icecap Act 2
8C954	Icecap Act 2 Underwater
8C9D4	Launch Base Act 1
8CA34	Launch Base Act 2
8CA94	Launch Base Act Underwater
8CB74	2P Level - Azure Lake
8CBD4	2P Level - Balloon Park
8CC94	2P Level - Chrome Gadget
8CC34	2P Level - Desert Palace
8CCF4	2P Level - Endless Mine
8CD54	Bonus Stage
A943C	Mushroom Hill Act 1
A949C	Mushroom Hill Act 2
A909C	Flying Battery Act 1
A90FC	Flying Battery Act 2
A94FC	Sandopolis Act 1
A955C	Sandopolis Act 2
A967C	Lava Reef Act 1
A96DC	Lava Reef Act 2
A9CDC	Lava Reef Act 2 Boss
A9D3C	Hidden Palace
A973C	Sky Sanctuary Act 1
A979C	Sky Sanctuary Act 2
A98BC	Death Egg Act 1
A991C	Death Egg Act 2
A9D9C	Death Egg Act 2 Boss
A997C	The Doomsday
164896	Marble Garden Act 2 - Day to Night #1
164916	Marble Garden Act 2 - Day to Night #2
164996	Marble Garden Act 2 - Day to Night #3
164A16	Marble Garden Act 2 - Day to Night #4
19D262	Data Select - Background
19D282	2P Menu - Background

For information about the palette format, see Megadrive palette.

Pattern Load Cues

Object Editing

Object Pointer List

Sprite Mappings

Object Placement

There are six bites in one object definition. The first two bytes are the X position of the object, and the next two bytes are the Y position. The 5th byte is the reference number on the object pointer list (see above), and the 6th byte is an optional declaration to use for defining that object's behavior and/or animation. This will depend on the object. See the level specific hacking info for the locations of the object lists.

The 6th byte, the object subtype, is loaded in the 28th byte of the SST of that object (see below).

Ring Placement

There are four bytes for every ring object. The first 2 bytes are X coordinates, after that there is one nibble to determine how many rings, then three nibbles (or one nibble and one byte) for the Y coordinates. After you are done adding all your rings for the level, "FF FF" will end the ring data. A format would look like this:

XX XX TY YY

Where X represents X position, Y represents Y position, and T represents type, as per the table below.

Example: 03 46 10 2B

If you see this, then you will get two horizontal rings at X = 0346 Y = 02B. The "1" determines how many rings there are, and what direction they go. (horizontal or vertical) Here is what you get for each value:

Value	Rings
0	1 Horizontal
1	2 Horizontal
2	3 Horizontal
3	4 Horizontal
4	5 Horizontal
5	6 Horizontal
6	7 Horizontal
7	8 Horizontal
8	1 Vertical
9	2 Vertical
A	3 Vertical
B	4 Vertical
C	5 Vertical
D	6 Vertical
E	7 Vertical
F	8 Vertical

Level Layout

Level layouts are compressed in Kosinski format, so to edit them you will need to decompress them first. (I recommend using TSDC for this)

Level layouts are pretty simple. There is one bye per 128x128 tile to place on the map. The blocks are put together from left to right, top to bottom. Each horizontal row is 60 bytes long. 60 bytes for the first row of the foreground, then 60 bytes for the first row of the background, then 60 bytes for the second row of the foreground....(it continues like this).

See the level specific hacking info for the locations of level layout data. (Put here for now, will eventually be moved to subpage)

Offset	Level Name
2814A8	Angel Island 1
281CF4	Angel Island 2
282A5A	Hydrocity 1
283582	Hydrocity 2
28442A	Marble Garden 1
2850BA	Marble Garden 2
285E6A	Carnival Night 1
286A34	Carnival Night 2
2879C2	Icecap 1
28898A	Icecap 2
2897DA	Launch Base 1
28A786	Launch Base 2
09F43E	Mushroom Hill 1
0A0172	Mushroom Hill 2
09D708	Flying Battery 1
09D708	Flying Battery 2
0A0DE2	Sandopolis 1
0A1C4E	Sandopolis 2
0A2A66	Lava Reef 1
0A388E	Lava Reef 2
0A76F4	Lava Reef 2 (Robotnik)
0A79AC	Hidden Palace
0A4616	Sky Sanctuary 1
0A5286	Sky Sanctuary 2
0A5402	Death Egg 1
0A63D0	Death Egg 2
0A7FD4	Death Egg 2 (Robotnik)
0A725E	Doomsday

16x16 Block Mappings

Text Editing

RAM Hacking

Variables

Object Status Table

Sonic Community Hacking Guide
General
SonED2 Manual \| Subroutine Equivalency List
Game-Specific
Sonic the Hedgehog (16-bit) \| Sonic the Hedgehog (8-bit) \| Sonic CD (prototype 510) \| Sonic CD \| Sonic CD (PC) \| Sonic CD (2011) \| Sonic 2 (Simon Wai prototype) \| Sonic 2 (16-bit) \| Sonic 2 (Master System) \| Sonic 3 \| Sonic 3 & Knuckles \| Chaotix \| Sonic Jam \| Sonic Jam 6 \| Sonic Adventure \| Sonic Adventure DX: Director's Cut \| Sonic Adventure DX: PC \| Sonic Adventure (2010) \| Sonic Adventure 2 \| Sonic Adventure 2: Battle \| Sonic Adventure 2 (PC) \| Sonic Heroes \| Sonic Riders \| Sonic the Hedgehog (2006) \| Sonic & Sega All-Stars Racing \| Sonic Unleashed (Xbox 360/PS3) \| Sonic Colours \| Sonic Generations \| Sonic Forces
Technical information
Sonic Eraser \| Sonic 2 (Nick Arcade prototype) \| Sonic CD (prototype; 1992-12-04) \| Dr. Robotnik's Mean Bean Machine \| Sonic Triple Trouble \| Tails Adventures \| Sonic Crackers \| Sonic 3D: Flickies' Island \| Sonic & Knuckles Collection \| Sonic R \| Sonic Shuffle \| Sonic Advance \| Sonic Advance 3 \| Sonic Battle \| Shadow the Hedgehog \| Sonic Rush \| Sonic Classic Collection \| Sonic Free Riders \| Sonic Lost World
Legacy Guides
The Nemesis Hacking Guides	The Esrael Hacking Guides
ROM: Sonic 1 \| Sonic 2 \| Sonic 2 Beta \| Sonic 3 Savestate: Sonic 1 \| Sonic 2 Beta/Final \| Sonic 3	Sonic 1 (English / Portuguese) \| Sonic 2 Beta (English / Portuguese) \| Sonic 2 and Knuckles (English / Portuguese)
Move to Sega Retro
Number Systems (or scrap) \| Assembly Hacking Guide \| 68000 Instruction Set \| 68000 ASM-to-Hex Code Reference \| SMPS Music Hacking Guide \| Mega Drive technical information

SCHG