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SPECIFICTION
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PSeudo JS

naden.co

Web
Visit naden.co
Spec score 6.7 #19 of 25 in PlayStation Emulators

Spec sheet

What it does
PSeudo JS is a PlayStation (PSX) emulator based on JavaScript.Read 4 Oct 2026 · github.com
Purpose
PSeudo JS is a PlayStation (PSX) emulator written in JavaScript.Read 9 Oct 2026 · github.com
License
PSeudo JS is open source under the Apache 2.0 license.Read 9 Oct 2026 · github.com
Maker
The maker’s site identifies the company as Nadenco Smpc and gives Athens, Greece as its location.Read 9 Oct 2026 · naden.co
BIOS sourcing
The maker says they will not provide information on where to find a BIOS file.Read 9 Oct 2026 · github.com
Browser technologies
The project repository tags it with WebAudio and WebGL.Read 4 Oct 2026 · github.com
Build requirement
Building PSeudo JS uses the Clang compiler and the project’s build command in a terminal.Read 9 Oct 2026 · github.com
Code structure
The project uses .h headers alongside .js files, inlining modular code for optimization before runtime on the VM.Read 9 Oct 2026 · github.com
Codebase
It uses .h headers alongside .js files, inlines modular code for optimization before runtime, and is compatible with ES5 JavaScript onwards.Read 4 Oct 2026 · github.com
CPU implementation
The project uses a slow CPU interpreter, with an attempt to speed it up using a JavaScript tracer planned later.Read 4 Oct 2026 · github.com
Game support
The emulator can load some commercial games.Read 9 Oct 2026 · github.com
JavaScript compatibility
The codebase is compatible with ES5 JavaScript and later.Read 9 Oct 2026 · github.com
Live build
The maker’s site links to a live build at https://naden.co/pseudo.Read 9 Oct 2026 · github.com
Performance limit
The maker describes the speed and overall experience as mediocre at best and says the emulator is quite inaccurate on timing.Read 9 Oct 2026 · github.com
Performance limitation
The maker describes speed and overall experience as mediocre at best and timing as quite inaccurate.Read 4 Oct 2026 · github.com
Progress
The repository lists CPU Mips R3000A at 95%, DMA at 90%, CD Decoder at 75%, Audio at 60%, and XA Audio at 10%.Read 4 Oct 2026 · github.com
Run requirement
The project must run from a localhost server such as Apache, and testing requires a valid BIOS file in the bios folder.Read 9 Oct 2026 · github.com

Where Specifiction places it

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