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BeebIt will only run under the RISC OS operating system. It is compatible with the StrongARM processor, the Iyonix, A9home and Raspberry Pi computers.
There are two versions of BeebIt. BeebIt is maintained by myself and BeebItJ is maintained by James Lampard.
Please read the notes about each version to decide which one suits you the best.
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BeebIt
- BBC Model B Computer Emulator
Version 0.77 (02 Nov 2024) by Michael Foot (enhanced by Crispian Daniels)
 Emulates Acorn BBC Model B, BBC Model B+ and BBC Master 128 computers.
Requires OS, BASIC and filing system ROM images.
Runs on all versions of RISC OS from 3.00 to 6.0x.
Requires 32 bit system modules in System resources. Available from RISC OS Open.
Original release of BeebIt with original 6502 CPU engine.
Download BeebIt 0.77 (120 KB) [32 bit]
Download Source Code for BeebIt
View the list of Changes to BeebIt.
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BeebItJ
- BBC Model B Computer Emulator
Version 1.03 (07 Nov 2007) by James Lampard
Emulates Acorn BBC Model B, BBC Model B+ and BBC Master 128 computers.
Requires OS, BASIC and filing system ROM images.
Runs on all versions of RISC OS from 3.50 to 6.0x.
Requires 32 bit system modules in System resources. Available from RISC OS Open.
Enhanced release of BeebIt with new 6502 CPU engine up to 20% faster.
Download BeebItJ 1.03 (88140 bytes) [32 bit]
View the list of Changes to BeebItJ.
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New features in BeebIt version 0.77:
Storing shadow memory in RAM order. Allows Acornsoft Maze v2 to display correctly in Master mode.
Made B+, Master and Master Compact ROM paging faster by moving 16 KB copy operations to the opcode 07 interface.
Fixed ADC values when Joystick is not being emulated. Stops cursor moving by itself in Colossus Chess 128K.
Fixed Mouse-Joystick emulation in display modes that are not 1280x1024 OS units.
New features in BeebIt version 0.76:
Added OS_ScreenMode enumeration to find available modes.
Added switch to full 256 colour mode from 64 colour.
Added conversion for 16-bit and 32-bit screen modes.
Added weighted colour, greyscale and green palette options.
Added 3:2 zoom for screen mode 1024 x 768.
Added teletext rounding for high resolution screen modes.
Various bug fixes for Stunt Car Rracer, Revs etc.
Fixed Low mode screen save overflow when the host Mode 7 is 640 x 500.
Fixed 6845 vertical total adjust.
Improved detection of floppy disc images.
New features in BeebIt version 0.74:
Fixed CPU CLI instruction to allow Lemming Syndrome to work.
Corrected display of teletext separated graphics.
Allowed a key map file to relocate the key code for the Break key (&80).
New features in BeebIt version 0.72:
Fixed CPU address wrapping for post indexed y mode. Allows Pacman Attract to work.
Added 1920 x 1050 and 1920 x 1080 screen modes.
Fixed VIA timings to correct JSW2 and Elite palette change timings.
New features in BeebIt version 0.70:
Fixed M128 shadow memory access to allow By Fair Means of Foul 128K to run.
Fixed M128 ROM/shadow RAM bank swapping to allow By Fair Means of Foul 128K to run.
Fixed music on Prince of Persia.
Fixed screen shot saving.
New features in BeebIt version 0.68:
Fixed M128 shadow memory access for the detection of SWRAM to allow Prince of Persia to run.
Corrected teletext emulation display issues to allow Prince of Persia to display the title screen correctly.
New features in BeebIt version 0.66:
Added screen mode 1280 x 1024 for RISC OS 5 machines.
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New features in BeebItJ version 1.03
New version of ZeriBeep, which works with Speech! and now has just 1 version for 26bit/32bit platforms.
Some error messages strings are now translated through the Messages file.
Now checks which modes are available and will use modes bigger than 640x256, if required.
Sprite save now works, even if BeebIt uses bigger than 640x256 mode.
If on entering emulation boot fails (ie corrupt MOS rom image) then BeebIt will return to the desktop with an error.
On RISC OS 6 now uses BeebIt's own mode 7 emulation, rather than that provided by the VideoTTX module.
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Software by James Lampard
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BeebItFS
- BBC emulator filing system
Version 0.33 (24 May 2005)
BeebItFS is an 8-bit BBC Micro filing system, written so BeebIt can access files on RISC OS filing systems. It also allows the use of some 6502Em style 'BBC Applications'.
Download BeebItFS (44449 bytes)
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BBCFiles
- BBC file converter
Version 0.44 (14 Jan 2004)
Converts between some of the various types of files used by BBC emulators on Acorn & PC formats.
Supports 6502Em style applications & scripts, /ssd dfs disc images (including watford double catalogue), vanilla directories, bbc files with /inf files and /uef files.
Download BBCFiles (212439 bytes)
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DSDUtil
- DSD image splitter
Version 0.02 (22 Oct 2003)
Creates and splits double sided BBC disc images.
Download DSDUtil (21912 bytes)
Before this program will run, you need to have on your computer 'Frontender' (at least version 2.00.5). If you don't already have it you can download it from here.
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Software by Richard A. Averill
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DFS
- ArcDFS DFS Filer
Version 1.03 (16 Apr 1990)
Filing system for DFS floppy discs and DFS disc images.
Can be used to create disc images for use with BeebIt.
(C) Richard A. Averill, 1990
Richard A. Averill is the original author of ArcDFS. He has given permission for it to be distributed from these pages.
Download ArcDFS (58000 bytes)
Manual for ArcDFS - Cover Page (546122 bytes),
HTML/Text (413628 bytes)
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Various pieces of BBC software I have written
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BBC Cheats - Cheats from BBC Computer games.
6522 VIA - 'C' source code from BeebIt showing how the Rockwell 6522 VIA chip works internally.
Hangman - Teletext version of Hangman.
ParaDrop - Try to land on the target without getting blown off course.
Snake Shoot - Shoot the tail off the snake.
Sniper - Shoot the snipers before they get you.
MICHAELS.SSD - Michael Foot's BBC Programs written between 1985 and 1989.
MSCREEN - Repton 3 screens for the BBC Micro and M128 versions only.
BBC ROM Labels - Labels to print out and label the ROMs inside your BBC Computer. Use thin double sided tape to attach.
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Acorn BBC Computer Emulation Software