Acorn For Mac Os X


What is ArcEm?

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ArcEm is a portable open-source emulator for the Acorn Archimedes. It's capable of running multiple operating systems including RISC OS and ARM Linux.

ArcEm runs on:

  • Amiga OS
  • Mac OS X
  • Microsoft Windows
  • Unix (X Windows)

If you're interested in helping the project, check out the developer page.


16th April 2017 – ArcEm 1.50.2 release for RISC OS
This is just a maintenance release for the RISC OS version of ArcEm. Compared to 1.50.1, the only notable change is that the code has been rebuilt using GCC 4.7.4 release 3, resolving an ARMv8 compatibility issue that was present with the previous release. Grab the new version now from the SourceForge project files page.
18th December 2015 – ArcEm 1.50.1 release for RISC OS
This is just a maintenance release for the RISC OS version of ArcEm. There are only two notable changes compared to 1.50:
  • The released binary has been compiled with GCC 4.7.4, eliminating a null pointer deference bug that was present with the previous version of GCC/UnixLib
  • Support has been added for the new screen modes introduced with RISC OS 5.21 (e.g. 64k colour modes and red/blue swapped modes), improving compatibility with new machines

Grab the new version now from the SourceForge project files page.

16th December 2012 – ArcEm 1.50 release
The full ArcEm 1.50 release is now available for RISC OS, Windows, Mac OS X, and Amiga OS – get it here. The source code is available and can be built for Unix-like platforms.
21st October 2012 – 1.50 alpha 2 for RISC OS
An updated alpha build has been released for RISC OS – get it here. This version has improved error reporting, fixes to the tweak menu, and will run correctly on the Raspberry Pi.
23rd July 2012 – ArcEm 1.50 alpha release
A new alpha build – ArcEm 1.50 alpha – is now available for AmigaOS 3, AmigaOS 4, Mac OS X, RISC OS, and Windows.
11th June 2012 – ArcEm still going
May 2012 saw a push of a large number of updates, significant performance improvements from Jeffrey Lee.


New in ArcEm 1.50

  • VIDC1 sound support on Amiga, RISC OS & Unix/X11
  • Emulation of 512kB, 1MB, 2MB, 4MB, 8MB, 12MB, or 16MB of RAM
  • Emulation of 'Extension ROMs' as found in the Acorn A4
  • ARM3 emulation
  • ArcEm clock set from Host's clock, partial RTC support
  • Accurate video and timer emulation
  • Display upscaling
  • Rectangular pixel aspect ratio correction (RISC OS, Windows & X11)
  • Significant performance improvements, making ArcEm run better on slow hardware
  • When emulating RISC OS:
    • HostFS - A RISC OS file system to allow use of a directory on the Host Filing system as a virtual hard drive
    • Mouse Scroll wheel support
    • Extra video modes, up to 1024x768 in 16 colours and 800x600 in 256 colours

ArcEm 1.00

  • Acorn A400 with ARM 2 processor
  • Runs RISC OS and ARM Linux
  • 4MB of RAM
  • Support for .adf floppy disc images
  • Support for ST506 hard discs up to 64MB in size



Remember to check the User Manual for installation and compilation information. Our downloads are available from SourceForge:

  • Download ArcEm 1.50 (Dec 2012)
  • Download ArcEm 1.00 (May 2002)

Source code is in CVS: Ppt to avi for mac.

Various builds of ArcEm are also available from 3rd party sources:

  • Download autobuilt RISC OS package (ArcEm 1.00)

Support Files

FileDownload SizeHarddrive shape (see User Manual)
Blank RISC OS formatted 800KB Floppy Disc Image1.1KB
RISC OS disc with !HForm on, the hard disc formatter14k
Blank RISC OS formated 20MB Hard Drive Image40KB612 cylinders 4 heads 32 sectors 256 record size
Blank RISC OS formated 64MB Hard Drive Image65KB1024 cylinders 8 heads 32 sectors 256 record size
A 64MB RISC OS Hard Drive Image Loaded with programsComing Soon!1024 cylinders 8 heads 32 sectors 256 record size
ARMLinux Rom Image335KB2.2 Kernel
ARMLinux ext2 formated 20MB Hard Drive Image, with skeleton Linux distribution.3.4MB612 cylinders 4 heads 32 sectors 256 record size

Having Problems?


Please have a read through the User manual, to see if it answers your questions.

Mailing list

Join the user mailing list, arcem-user, and ask a question there, or check the archives to see if anyone else has had the same problem. Angry birds for mac free download full version.

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Reporting bugs

Acorn Mac Os X

ArcEm uses SourceForge's bug tracking system, you can enter a bug report here.

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