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Sonic the Hedgehog CD/RAM Editing

From Sonic Retro

SCHG: Sonic the Hedgehog CD
Main Article
File Locations
File Locations
Art Editing
Editing Art
Nemesis Format Art
MMDs, A-P
Palmtree Panic MMDs
Collision Chaos MMDs
Tidal Tempest MMDs
Quartz Quadrant MMDs
Wacky Workbench MMDs
Stardust Speedway MMDs
Metallic Madness MMDs
MMDs, S-W
MMD Tweaking
Tweaking MMDs
Maximum rings allowed
Minimum rings for Giant Ring
Rings given by ring
Rings given by Ring Monitor
Invincibility duration
Super Sneakers duration
Regular speed stats
Super Sneakers speed stats
RAM Editing
RAM Editing

Main System Memory locations

This is a map of 68k memory as used by the main gameplay engine. For the most part, the memory locations in Sonic CD are the same as they are in the Mega Drive Sonic games. The following are mainly memory locations specific to Sonic CD. Note that any numbers entered (for example, score or number of rings) will have to be converted to hex first.

These are the offsets in RAM.

RAM offset Description
$1512 Ring Counter
$1516 Timer
$151A Score
$152E Time Period. 00 is past, 01 is present, 02 is future
$1548 - $154B X and Y location when time traveling. Used to determine where you spawn.
$156A Good future flag.

References


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