An in-progress decompilation of the 1.1 US release of Silent Hill on the Playstation 1.

Due to the limited memory on the PlayStation 1, games often distribute their logic and functionality across different binary overlays. Silent Hill follows this approach by separating core engine code, screen-related code, and map stage event code into many distinct binaries. The main executable (SLUS_007.07 on the 1.1 NTSC release) serves primarily as a memory handler.

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⚙ SLUS-00707 ⚙
Progress	Purpose
	Main executable.
Progress	Purpose
	Psy-Q libraries.
🎮 Game System Overlays 🎮
Click here to expand 🧟‍♂️⚔⚙🎮 BODYPROG.BIN 🎮⚙⚔🧟‍♂️ Progress Purpose Main game logic. 👨‍💼 B_KONAMI.BIN 👨‍💼 Progress Purpose Note Boot screen logic. First fully decompiled and matching overlay! 🎞 STREAM.BIN 🎞 Progress Purpose Note Full motion videos stream logic. Third fully decompiled and matching overlay! 💾 SAVELOAD.BIN 💾 Progress Purpose Note Save and load screen logic. Fourth fully decompiled and matching overlay! 📜 STF_ROLL.BIN 📜 Progress Purpose Note Credits roll logic. Second fully decompiled and matching overlay! 🛠 OPTION.BIN 🛠 Progress Purpose Note Options screen logic. Fifth fully decompiled and matching overlay!
🗺 Game Map Overlays 🗺
Click here to expand 🏙 MAP0 🏙 Progress Location Nightmare intro sequence in Old Silent Hill. Cafe in Old Silent Hill. Bonus unlockable areas in Old Silent Hill. 🏫 MAP1 🏫 Progress Location School first floor, courtyard, and basement. School second floor. School first floor and courtyard in Otherworld. School second floor and school roof in Otherworld. Unknown School location, likely in Otherworld. School boss fight School first floor and basement after the boss fight. 🏙 MAP2 🏙 Progress Location Old Silent Hill after finishing the school. Church Central Silent Hill Unknown Location related to Central Silent Hill. Police station in Central Silent Hill. 🏥 MAP3 🏥 Progress Location Hospital beginning. Ends after meeting with Kaufmann. Hospital 1st and basement floors after meeting with Kaufmann. Green Lion Antique Shop cutscene in the Hospital. Hospital third and second floor in Otherworld. Hospital first floor in Otherworld. Hospital basement in Otherworld. Hospital first floor after the Otherworld section. 🏙 MAP4 🏙 Progress Location Unknown Green Lion Antique Shop in Central Silent Hill and Otherworld. Central Silent Hill in Otherworld. Mall and boss fight. Hospital First Floor Cutscene with Lisa after finding the altar in the Green Lion Antique Shop and meeting Lisa again after the mall boss fight. Central Silent Hill Floatstinger boss fight in Otherworld. Unknown 🏙🍹 MAP5 🍹🏙 Sewers lower and upper levels. Silent Hill Resort Area. Annie's Bar and Indian Runner in Resort Area. Norman's Motel in Resort Area. 🏙🍹🔥 MAP6 🔥🍹🏙 Silent Hill Resort Area in Otherworld. Boat at Lakeside Pier. Lakeside Pier and Lighthouse. Sewer connecting to Lakeside Amusement Park. Cybil boss fight and cutscene of Dahlia kidnapping Alessa. Unknown ❔🏥 MAP7 🏥❔ Progress Location Hospital first floor in Nowhere and Lisa cutscene. Unknown Nowever related. Unknown Unknown parts of Nowhere and parts of the cutscene when Alessa struggles against Dahlia. Final boss fight.

The build process has the following package requirements:

• git
• build-essential
• binutils-mips-linux-gnu
• cpp-mips-linux-gnu
• python3
• python3-venv
• bchunk
• 7z

Under a Debian-based distribution (or Windows with a Debian-based WSL2 setup), you can install these with the following commands:

sudo apt update
sudo apt install git build-essential binutils-mips-linux-gnu cpp-mips-linux-gnu python3 python3-venv bchunk p7zip-full

Clone https://github.com/Vatuu/silent-hill-decomp to your desired directory. Make sure to clone recursively!

git clone --recursive https://github.com/Vatuu/silent-hill-decomp.git && cd silent-hill-decomp

You will need to provide your own ROM dump of the NTSC-U 1.1 version of the game, if dumped correctly you should have a .BIN file with the SHA1 hash 34278D31D9B9B12B3B5DB5E45BCBE548991ECBC7 (616,494,480 Bytes / 587 MiB).

After dumping, this BIN file must be placed as rom/image/SLUS-00707.bin in the repo.

Modern Linux distros require a virtual environment to be setup before installing requirements with pip.

You can setup an environment in the repo folder with the following:

python3 -m venv .venv # creates a .venv folder with the environment
source .venv/bin/activate # activates the environment (needs to be run in every new terminal session)
python3 -m pip install -r requirements.txt # installs the project requirements from requirements.txt

Run make setup to extract needed assets and code from the binary. If the setup was successful, run make to build. Once the build has finished, a folder named build will be produced. The output will be inside this.

Additional Make commands:

• build: Builds the executable and overlays.
• check: Builds the executable and overlays. After compilation, it compares checksums with the original files.
• clean-build: Clears the project configuration without deleting files.
• clean-check: Clears the project configuration without deleting files. After compilation, it compares checksums with the original files.
• objdiff-config: Generates project configuration for Objdiff.

NOTE: clean-build/clean-check are obligatory if the configuration in the Makefile has been modified when intending to work on different overlays.

Contributions are welcome. Following our code conventions, feel free to contribute via a pull request or issue and join us in the PS1/PS2 Decompilation Discord server's #silent-hill channel.