ROMhacking Int. 104 Compression Scheme RE

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ROMhacking Int. 104 Compression Scheme RE

Assembly

Title

ROMhacking Int. 104 Compression Scheme RE

Description

This document attempts to be a learning reference to 'attack' compression in a game, from start to
finish, with all the (minimum required) theory followed by practical examples. All of the steps and explanations are applied to an actual project with actual screenshots of the project.

References will be given when required, you can use them to dive deeper. But rest assured, you
will only need the tools used in each step to follow along. You can just read this paper without any
extra material if your only goal is to learn about the process.

You must know that each section of this document can be read standalone. If you want to read
only one section, don’t be afraid to do so, however, you will benefit from reading all.

* Note: The actual extraction/reinsertion from/to the ROM won't be detailed here. If you need a hint
for that, just mind the offset to extract or reinsert bytes and copy them in or out.

The end goal is to understand and be able to use and export the knowledge to do this process, not
to parrot. Remember: Curiosity leads to knowledge, be curious

Author

Bunkai