PSP.js

What PSP.js is

PSP.js is a free, open-source PlayStation Portable emulator for the web, written in TypeScript. Its high-level emulation recreates PSP system calls in TypeScript, so it does not require a BIOS ROM. It loads ISO and PBP games, including KIRK-encrypted EBOOTs, and runs the MIPS Allegrex CPU and VFPU. Graphics are rendered through WebGL; the project also describes decoding ATRAC3+ audio and MPEG/PSMF video. Game data is saved in browser storage, and keyboard controls can be configured in the app. The project remains a work in progress: it reports that several commercial games boot to menus and render, and links to a per-game compatibility list. Running the graphics worker requires SharedArrayBuffer, so a plain static file server will not work. The documented local setup uses Git submodules, npm install, and npm run dev, with a development server that sends the required COOP/COEP headers. Project documentation covers the user guide, architecture, and subsystem and HLE module references.