b-em – open source BBC Micro emulator

B-em is an emulator for various models of BBC Microcomputer, produced by Acorn Computers in the 1980s.

B-em runs under Linux and Windows, but may also work on other systems supported by the Allegro library.

The emulator is released under an open source license.

Features include:

  • Emulates Models A, B, B+, Master 128, Master 512, Master Turbo and Master Compact.
  • Also emulates ARM evaluation system on Master 128.
  • Emulates 6502 external, 6502 internal, 65816, 80186, ARM, Z80 and 32016 tubes. Configurable tube speed: 100%, 200%, 400%, 800%, 1600%, 3200%, and 6400%.
  • Cycle-accurate video emulation.
  • Configurable speed including full speed.
  • All documented and undocumented 6502 instructions.
  • 8271 Floppy Disc Controller emulated (double drive, double sided, 80 track, read/write).
  • 1770-based Floppy Disc Controllers from various manufacturers emulated including Acorn, Opus, Solidisk, Watford Electronics (double drive, double sided, 80 track, read/write).
  • Supports following disc formats – .ssd, .dsd, .adf, .adl, .img, .fdi and variants for the non-Acorn DFSes.
  • Supports tape formats: .uef and .csw.
  • Can run many protected disc and tape games.
  • SCSI and IDE hard disc emulation.
  • Sound emulation, including sample playback.
  • BeebSID emulation.
  • Hybrid Music System emulating including Music 500o (synth), Music 4000 (keyboard, emulated via MIDI) and Music 2000 (MIDI).
  • Full screen option.
  • Lots of video tricks, such as overscan, raster splitting, rupture, interlace, mid-line palette and mode splits, etc.
  • Video NuLA extended pallete ULA emulation.
  • Sideways RAM emulation.
  • Joystick emulation.
  • AMX Mouse emulation.
  • Screenshot functionality.

Support: Forum
Developer: Steve Fosdick, David Banks, Thomas Adam
License: GNU General Public License v2.0


B-em is written in C. Learn C with our recommended free books and free tutorials.

Return to Home Computer Emulators

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