PSP.js vs ScePSP

PSP.js is a browser-based PlayStation Portable emulator written in TypeScript and offered free as open-source software. Its high-level emulation implements PSP system calls, so it does not need a BIOS ROM. It loads ISO and PBP games, including KIRK-encrypted EBOOTs, and emulates the MIPS Allegrex CPU and VFPU. Graphics are rendered with WebGL; the project also describes decoding ATRAC3+ audio and MPEG/PSMF video. Game data is kept in browser storage, and keyboard controls can be configured in the app. The project remains a work in progress: it reports that some commercial games reach menus and render, and points users to a per-game compatibility list. The graphics worker requires SharedArrayBuffer, so a plain static file server is not sufficient. For local development, the documented setup uses Git submodules, npm install and npm run dev, with a server that sends COOP/COEP headers. Documentation covers the user guide, architecture, subsystems and HLE modules.

ScePSP has no write-up on Specifiction yet; its figures are above.