JSSpeccy 3
jsspeccy.zxdemo.org
Spec sheet
- Purpose
- JSSpeccy 3 is a ZX Spectrum emulator that runs in a browser.Read 4 Oct 2026 · jsspeccy.zxdemo.org
- Support
- The maker describes it as a personal project and makes no commitment to provide technical support or assistance.Read 4 Oct 2026 · github.com
- License
- JSSpeccy 3 is licensed under GPL version 3.Read 4 Oct 2026 · github.com
- Maker
- The official site credits Matt Westcott as the maker.Read 4 Oct 2026 · jsspeccy.zxdemo.org
- Audio
- It supports AY and beeper audio.Read 4 Oct 2026 · github.com
- Configuration
- Embed options include machine selection, zoom, auto-start, tape auto-loading, file loading by URL, and disabling file-opening controls with sandbox mode.Read 4 Oct 2026 · github.com
- Display
- It provides cycle-accurate scanline and multicolour effects, with 100%, 200%, 300% and fullscreen display modes.Read 4 Oct 2026 · github.com
- Display accuracy
- It provides cycle-accurate emulation of scanline and multicolour effects.Read 4 Oct 2026 · github.com
- Display modes
- It offers 100%, 200%, 300% and fullscreen display modes.Read 4 Oct 2026 · github.com
- Embedding
- The project is designed to be embedded in websites using its JavaScript file and a page element for the emulator.Read 4 Oct 2026 · github.com
- Emulated machines
- It emulates the Spectrum 48K, Spectrum 128K and Pentagon machines.Read 4 Oct 2026 · github.com
- File formats
- It loads SZX, Z80 and SNA snapshots, plus TZX and TAP tape images using traps; supported files can also be loaded from ZIP archives.Read 4 Oct 2026 · github.com
- Implementation
- The emulator runs in a Web Worker, with its core compiled to WebAssembly from AssemblyScript.Read 4 Oct 2026 · github.com
- Notable limit
- Loading remote files by URL is subject to browser security restrictions; files hosted on another domain need to be served with CORS headers.Read 4 Oct 2026 · github.com
- Processor emulation
- It handles documented and undocumented Z80 instructions.Read 4 Oct 2026 · github.com
- Remote file loading
- Loading files from another domain requires that domain to serve CORS headers.Read 4 Oct 2026 · github.com
- Supported files
- It loads SZX, Z80 and SNA snapshots, plus TZX and TAP tape images via traps, and can load these formats from ZIP files.Read 4 Oct 2026 · github.com
- Supported machines
- It emulates the Spectrum 48K, Spectrum 128K and Pentagon machines.Read 4 Oct 2026 · github.com
Where Specifiction places it
- ZX Spectrum Emulators#17 of 237.1
