Jsbeeb

[](https://github.com/mattgodbolt/jsbeeb/actions/workflows/test-and-deploy.yml)

jsbeeb - JavaScript BBC Micro Emulator

[](https://bbc.xania.org/)

A BBC Micro emulator written in JavaScript and running in modern browsers. Emulates a 32K BBC B (with sideways RAM) and a 128K BBC Master, along with a number of different peripherals.

Table of Contents

• Keyboard Mappings
• Emulator Shortcuts
• Save State and Rewind
• Getting Set Up to Run Locally
• Running as a Desktop Application
• URL Parameters
• Patches
• Loading BASIC Files from GitHub Gists
• Things Left to Do
• Tests
• Thanks
• More Information
• License
• Contact

Keyboard Mappings

The BBC had a somewhat different-looking keyboard to a modern PC, and so it's useful to know some of the mappings:

• BBC F0 is F10
• BBC Break key is F12
• BBC * is on " (if it doesn't work for you try shift-2)

To play right now, visit [https://bbc.xania.org/](https://bbc.xania.org/). To load the default disc image (Elite in this case), press shift-F12 (which is shift-Break on the BBC).

Emulator Shortcuts

Shortcut	Action
Ctrl+Home	Stop and enter debugger
Ctrl+Insert	Toggle turbo (fast-as-possible)
Ctrl+End	Pause emulation
Alt+PageDown	Open rewind scrubber

Save State and Rewind

Save and load full emulator state snapshots from the **State** menu (or `Ctrl+S` / `Ctrl+O` in the Electron app).

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