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.

Website: github.com/stardot/b-em
Support:
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.

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