Click here to download the latest version of B-EM for DOS (version 1.1).
Click here to download the latest version of B-EM for Windows (version 2.2) (source code included).
Click here to download the latest version of B-EM for Linux (version 2.2) (source code included).
Click here to download the previous version of B-EM for Linux (version 2.0a) (source code included).
Click here to download the latest version of B-EM for Mac OS X (version 1.0).
Click here to download the B-EM source code (version 1.5).
June 3rd 2012
B-em v2.2 released.Changes from v2.1a: - MOS 3.50 emulation
- Fixed CRTC bug when programmed with stupid values (MOS 3.50 startup)
- ADFS disc corruption bug fixed (Carlo Concari)
- Fixed ACIA bug - Pro Boxing Simulator tape version now works
- Fixed bug which created endless blank hard disc images
- Printer port DAC emulation
- AMX mouse emulation
- Master 512 mouse now works properly
- Master Compact joystick emulation
- IDE emulation available in non-Master models
- UI fixes (some from Carlo Concari)
- Improvements to VIA emulation
- PAL video filter
- Bugfixes in ARM and 65816 coprocessors
- Debugger fixes
- Tidying up of code
- Windows version can now build on MSVC as well as GCC
February 14th 2011
B-em v2.1a released.Changes from v2.1: - Keyboard bug fixed, Dr Who : The First Adventure now works
- Video ULA bug, Atic Atac now has correct colours
- Cursor inversion now works properly
- Linux screenshots now work
- Save states in Linux
November 15th 2010
B-em v2.1 Linux version released. v2.1 has a more involved installation process than v2.0a, so the latter is still available. October 25th 2010
B-em v2.1 released.Changes from v2.0x: - IDE hard disc emulation
- OpenGL video support (mainly for Linux)
- Fixed 360k discs in Master 512 mode
- Fixed some hanging bugs in Windows (mainly when resetting)
- Resizeable window in Windows
- Debugger improvements
- VIA and video fixes, cassette version of Lunar Jetman now works
- Lightpen fix, Pharaoh's Curse works
- Some mode 7 fixes
- Speed control
- Savestates
Linux version should be updated shortly. August 26th 2010
B-em v2.0b released. Fixes (hopefully) a keyboard bug on some machines running Windows 7. March 16th 2010
B-em v2.0a released. Fixes a few bugs in v2.0. Also Linux port is now available. March 14th 2010
B-em v2.0 released.Changes from v1.5: - Most of the emulator re-written
- Cycle-accurate video emulation
- Higher quality mode 7
- Added 80186 (Master 512) and 65816 second processors
- BeebSID emulation (using resid-fp)
- FDI support is back
- Improved sound overall
- Much more stable
- Debugger
- Redefineable keyboard
- Now licensed under the GPL
Linux version should be out in a couple of days. May 20th 2008
B-em v1.5 released.Changes from v1.4a: - Acorn Z80 tube emulation
- Various fixes to video and sound
- New bandpass sound filter - recommended! (sounds very BBC-ish)
- Fixed crash bug on exit
June 10th 2007
B-em v1.4a released. This fixes the problems with modes 3 and 6. However, due to licensing problems, FDI disc images are no longer supported.
May 15th 2007
B-em v1.4 released.Changes from v1.3: - 65c012 tube emulation (+ Master Turbo) - from 4mhz to 64mhz
- Fixed bug in ARM tube emulation
- Sideways ROMs supported in Master emulation
- Windows version now releases unneeded CPU time
- Sound should hopefully be better
December 13th 2006
B-em v1.3 released.Changes from v1.2: - Better sound in Windows version
- Better CSW support
- Bugfix in mode 7
- Bugfix in cursor handling - Frogman works again, no more random crashes in some games
- Periodic noise pitch now correct - see Icarus, Cute To Kill
- Video can now use hardware scaling - should be faster
- Removed colour errors with 2xSaI filter
- File dialogs now (finally!) work properly
Only Windows port updated at the moment, DOS version should be brought up to date before the end of the year. July 28th 2006
B-em v1.2 released.Changes from v1.1: - Preliminary CSW support
- Improved timing, more protected games work (eg Nightshade, Tapper, Beach Head etc)
- E00 DFS now supported
- Disc writing works properly again
May 7th 2006
B-em v1.1 released.Changes from v1.0: - Can now emulate a Model B with 1770 FDC
- Better mode 7 emulation - many programs improved, eg Granny's Garden
- Added cursor to modes 0-6
- Altered video timing a little
- Added more commands to 1770 FDC - Watford DDFS now works (single density only)
- Some optimisations to video code
- Update VGM logging to latest spec
February 1st 2006
The OS X port has been updated to version 1.0, thanks to Thomas Harte. December 24th 2005
B-em v1.0 released.Changes from v0.82: - FDI support. Allows use of copy protected disc images. A few bugs in FDC emulation remain, however about 75% of FDI images dumped so far work.
- Improvements to timing, Joust now works, along with some Kevin Edwards protected games.
- Master Compact emulation (largely for some of the dumped FDI images).
- Slight improvements to cassette emulation, loader on Joust now works, speedup now available.
- Fixes and optimisations to ARM emulation.
A load of FDI files will be available at www.acornpreservation.org later today, thanks to Dave Moore. August 11th 2005
B-em v0.82 released.Changes from v0.81b: - ARM Evaluation System emulation. Beware that this is quite slow and probably buggy (I don't have any software to test on it)
- Fixed ADC/SBC BCD flags that were broken in 0.8 - Exile works again
- Added read ID commands to 8271 FDC - Superior Collection now works
- Ported to OS X
August 4th 2005
The first OS X alpha of B-em is now available, thanks to Thomas Harte. July 28th 2005
B-em v0.81b released.Changes from v0.81a: - Audio buffer length now user selectable (Windows only)
- Fixed bug with instructions like STA $FFFF,x - 3D Grand Prix no longer crashes
- A few other fixes
July 27th 2005
B-em v0.81a released.Changes from v0.81: - Adjusted audio a bit, less lagging in Windows port
- Fixed VGM logging
July 26th 2005
B-em v0.81 released.Changes from v0.8: - Fixed bugs in 8271 and 1770 FDCs, all write operations should now work, along with formatting. The Hobbit also now works correctly
- Fixed some crash bugs
- Added command line options, mainly for use by frontends
July 2nd 2005
B-em v0.8 released.Changes from v0.71b: - Timing improvements, some stuff that encrypts via timers (eg Frogman) now works
- VIA improvements - fixed Planetoids/Super Defender/whatever, Volcano and Pharoah's Curse
- Improvements to sound accuracy, Ghouls and Killer Gorilla (and probably others) have better sound
- Cassette emulation now much more reliable, and supports HQ-UEF files
- Save states are implemented again
- Config file now in English
- Added high pass sound filter and SID waveform
- Vastly improved Windows port
July 27th 2004
B-em v0.71b released.Changes from v0.71/0.71a: - 8271 FDC now supports writing
- FDC no longer crashes B-em in The Hobbit
- Windows version should be more responsive
July 6th 2004
B-em v0.71a released (Windows only update).This release fixes a stupid bug relating to system resources on Windows. July 5th 2004
B-em v0.71 released.Changes from v0.7: - Stupid bug in Master 128 fixed - most Master stuff should work now
- High resolution video now supported
- 2xSaI filter
- Bugs fixed in CRTC, Uridium and Psycastria now look better
- Sound volume now logarithmic
- Couple of other bug fixes
- Win32 port can now run in a window
June 23rd 2004
Elkulator moved.It is now at http://elkulator.acornelectron.co.uk April 5th 2004
B-em v0.7 released.Changes from v0.61: - Master 128 emulation (buggy)
- Better video timing, Uridium works
- VIA interrupt bug fixed, many games better
- Interrupt bug fixed, Empire Strikes Back now working
- Disc write (B+ and Master 128 only)
- Sound mixing now 16 bit
- Low pass filter for sound
- Improved disc drive noise
- More reliable tape emulation
January 28th 2004
B-em v0.61 released.Changes from v0.6: - ADFS support
- Model A support
- Model B+ fixed a bit, Level 9 adventures now show pictures
- Win32 version improved a bit
- Some undocumented sound stuff emulated - Crazee Rider now has correct drums
- Some other misc changes
July 31st 2003
B-em v0.6 released.Changes from v0.5: - Model B+ support, along with 1770 emulation
- Totally rewritten 6502 core - faster, more accurate
- Fixed some VIA timing - Revs now works
- UEF works better
- New GUI
- Improved sound core - now supports sample playback
- Now emulates two disc drives
- Win32 version now available
December 23rd 2002
B-em v0.5 released.Changes from v0.4a: - Totally rewritten 6502 core - faster
- Totally rewritten video - better split palette/mode emulation + R5 scrolling and some rupture
- UEF support is back
- New GUI
- Blurring filter
- Switchable sound waveforms
- Samples no longer crash B-em
- Sideways RAM emulation actually works
- Joystick emulation
As usual, any feedback is appreciated. Send comments to : b-em@bbcmicro.com.
January 20th 2002
B-EM v0.4a released.Changes from v0.4: - Some 6502 bugs fixed, Exile now working properly
- Re-added Model A emulation
- Disc drive noise added
- Default config file no longer points to a non-existant file
- Can now log sound - invented new file format for this (.sn - player and format description included)
- Arrow keys and delete/copy now work again
- Updated documentation.
(Still) wanted: - Replica 2 (good tape-to-disc menu prog)
- Tube docs
- Working ACIA emulation
- Any ideas on how to get SN76489 samples working in Allegro's sound mixer
- Pinouts for the BBC tape port (and to know if it's safe to poke wires in there - I can't be bothered to make a real cable).
As always, feedback is appreciated/welcomed/required(!) - the address to send any comments to is: b-em@bbcmicro.com. January 13th 2002
B-EM v0.4 released.New in this version: - Sound is *much* better
- Speed increased 2-4 times
- Video emulation improved. Full overscan is supported, and the colour generation is the same as on a real BBC
- New GUI
- UEF support removed, as it were crap
- Directories semi-supported in TFS (for Dambusters and Sorcery)
- Setup removed (no longer needed)
- Some 6502 bugs fixed
- Sideways RAM emulation added, but quite buggy
- Exile now works! (just)
- Elite is now playable!
April 23rd 2001
Uploaded a replacement source code zip that includes a couple of extra files, plus improved documentation.April 22nd 2001
Uploaded the B-EM source code.Can anyone help with any of the following? - Speed up the 6502 emulation
- Speed up the video emulation
- Fix the 6850 emulation
- Fix some bugs in the 6522 emulation
- Sort out sound emulation
- Get bem.c to compile with optimisation
- Neaten up the source code (no chance!).
If you think you can assist Tom in any way, please contact him at b-em@bbcmicro.com. April 14th 2001
B-EM version 0.3a released.Differences from the last version: - 'clear screen' command removed, as it was using the same key as change disc
- stuff held in seperate directories:
- roms - OS ROM and paged ROMs
- inf - .INF files (with the extension-less files as well)
- uef - .UEF files
- discs - .SSD, .IMG, and .DSD files
- You shouldn't get 'chunk ID' errors anymore with the UEF code
- American BBC support.
*Please* let Tom know how you get on with the new version!! Any feedback should be directed to b-em@bbcmicro.com. April 1st 2001
First public release of B-EM (version 0.3).Features: - Emulates the BBC Model B
- All documented video modes supported
- All documented and undocumented 6502 instructions
- 8271 Floppy Disc Controller emulated (single drive, double sided, 80 track)
- Supports five formats for BBC storage on PC - .ssd, .dsd, .inf, .uef (preliminary) and __catalog__
- Sound emulation (preliminary)
- Snapshots
- Optional 6502 debugging to file.
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