Acorn BBC Micro /

b2 Active

Tom Seddon's emulator of the BBC Micro, BBC Master 128, Master Compact and Olivetti PC 128 S, with a separate debug build that adds a debugger for software development.

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Facts

Runs on
Windows, macOS
Native: x86-64, ARM64
Works with
RetroArch (b2), Lakka
License
Open source (GPL-3.0)
System ROMs
Original ROMs included
Mobile
None (no official phone or tablet version)
Models
Model B, Model B+, Master 128, Master Compact
Opens
.ssd .dsd
Written in
C++
Authors
Tom Seddon
Last checked
Oct 2026

Features

  • HasSave states
  • Not listed:Rewind
  • Not listed:Fast-forward
  • Not listed:Run-ahead
  • Not listed:Online multiplayer
  • Not listed:CRT shaders
  • HasA/V recording
  • Not listed:Cheats
  • Not listed:Achievements
  • Not listed:Themes

Input

  • HasGamepad
  • Not listed:Touch controls
  • Not listed:Light gun
  • HasMouse
  • Not listed:Positional key mapping
  • Not listed:Symbolic key mapping
  • Not listed:On-screen keyboard
  • Not listed:Native keyboard

For developers

  • HasDebugger
  • HasMemory viewer
  • HasDisassembler
  • Not listed:Profiler
  • HasTrace logger
  • Not listed:Scripting
  • Not listed:Command line

Emulated hardware

  • HasHard disk
  • Not listed:MIDI
  • HasPrinter
  • Not listed:Networking
  • Not listed:Modem
  • Not listed:RAM expansion
  • Not listed:Accelerator cards

Features not listed may still exist. Edit this entry if something is missing or wrong.