cakehonolulu / SimpleStation

PlayStation 1 (PSX) Emulator Written in C (SDL2)

A simple, multiplatform, Sony Playstation 1 emulator written in C

PSX Bootlogo

PAL PSX	NTSC PSX	Experimental Vulkan Renderer

PSX Menus

BIOS Menu	Another BIOS Menu	PSX Game Boot

PSX Demos

Amidog CPU Tests	Quads Demo	Goraud Triangle Demo

✨ Features

• Targets C23 features (Fallbacks present if not available)
• LLE Interpreter
• Multiplatform
• Multiarchitecture
• Hardware Renderer (OpenGL 3.3, and an experimental Vulkan renderer)

🖥️ Current state

CPU Subsystem

• All opcodes implemented (100%)
  • Regular, e(X)tended, Jump and Branch Opcodes
  • MIPS Coprocessor 0 Opcodes
  • MIPS 5-stage Instruction Pipeline Emulation
  • Readable-format disassembler with debugger and breakpoint support
  • Custom gdbstub implementation to debug PSX code with gdb
• No cache emulation (Yet!)

GPU Subsystem

• Sony's Propietary GPU
  • In the works
• Sony's Coprocessor 2 "GTE" (Geometry Transformation Engine)
  • In the works

DMA Subsystem

• DMA Unit
  • In the works

CDROM Subsystem

• CDROM Unit
  • In the works

BIOS Compatibility

• BIOS41A.bin | b9d9a0286c33dc6b7237bb13cd46fdee
  • Boots to badly-rendered shell
• SCPH101.bin | 6e3735ff4c7dc899ee98981385f6f3d0
  • Boots to shell
• SCPH1000.bin | 239665b1a3dade1b5a52c06338011044
  • Graphical glitches on boot logo, crashes due to missing CDROM commands
• SCPH1001.bin | 924e392ed05558ffdb115408c263dccf
  • Preferred BIOS by the emulator developer, boots to shell
• SCPH1002.bin | 54847e693405ffeb0359c6287434cbef
  • Infinite loop after boot logo (Right before shell)
• SCPH3000.bin | 849515939161e62f6b866f6853006780
  • Graphical glitches on boot logo, boots to shell
• SCPH3500.bin | cba733ceeff5aef5c32254f1d617fa62
  • Boots to shell
• SCPH5000.bin | 57a06303dfa9cf9351222dfcbb4a29d9
  • Boots to shell
• SCPH5500.bin | 8dd7d5296a650fac7319bce665a6a53c
  • Boots to shell
• SCPH5502.bin | e56ec1b027e2fe8a49217d9678f7f6bb
  • Nothing displayed, Illegal Opcode 0x0053DE3E
• SCPH5552.bin | 32736f17079d0b2b7024407c39bd3050
  • Infinite loop after boot logo (Right before shell)
• SCPH7000.bin | 8e4c14f567745eff2f0408c8129f72a6
  • Boots to shell
• SCPH7001.bin | 1e68c231d0896b7eadcad1d7d8e76129
  • Boots to shell
• SCPH7003.bin | 490f666e1afb15b7362b406ed1cea246
  • Boots to shell
• SCPH7502.bin | b9d9a0286c33dc6b7237bb13cd46fdee
  • Boots to badly-rendered shell

👷🏼‍♂️ Roadmap

• MIPS I R3000A to x86_64 (AMD64) Dynamic Recompilation (JIT)

🪐 Special Thanks

• @wheremyfoodat
• @liuk7071

📃 Documentation

• Integrated Device Technology, Inc. (1996). IDT MIPS Microprocessor Family Software Reference Manual. Wayback Machine. https://web.archive.org/web/20061010210946/http://decstation.unix-ag.org/docs/ic_docs/3715.pdf
• Flandrin, L. (2016, 20 October). Playstation Emulation Guide. svkt.org. https://svkt.org/~simias/guide.pdf
• PlayStation Specifications - psx-spx. (2022). PSX SPX Consoledev. https://psx-spx.consoledev.net/
• Copetti, R. (2022, December 24). PlayStation Architecture. The Copetti Site. [https://www.copetti.org/writings/consoles/playstation/]