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ArcEm 1.50 alpha 2


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)


ArcEm 1.50 – ?? ?? 2012

New features

  • Addition of ports to Amiga OS 3 and OS 4.
  • Sound emulation.
  • Support for RAM sizes other than 4MB (512KB, 1MB, 2MB, 4MB, 8MB, 12MB & 16MB now supported).
  • ARM250 & ARM3 CPU emulation.
  • ArcEm clock set from host's clock, partial RTC support.
  • Extension ROM emulation, allowing support for the following new features when emulation RISC OS:
  • HostFS - A RISC OS filesystem 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.

Bug fixes/Improvements

  • Many performance tweaks and optimisations, resulting in a 5-6 times performance gain on ARM hosts. A 600MHz XScale can now achieve a level of performance roughly equivalent to an 8MHz ARM2. Similar performance gains can be seen on other low-power hosts.
  • Video emulation rewritten to provide accurate redraw and VSync timing, down to the scanline level.
  • Video emulation now supports upscaling and aspect ratio correction for rectangular pixel modes.
  • All hardware clocks/timers (IOC timers, video DMA, audio DMA, etc.) now run in real time, ensuring one second takes one second no matter how fast the host machine is.
  • Source code tidied a bit to remove redundant code, including support for emulation of 32bit processor modes (there are other, much better emulators for that!).
  • Source code converted to use C99 number types to aid portability.
  • Instruction prefetch now correctly emulated - ensures correct operation with self-modifying code and some forms of copy protection.
  • RISC OS version now 32bit compatible, and ARMv7-safe. Also much more useable with modern machines/LCD monitors as it no longer requires the host to be able to support Archimedes screen modes.
  • Windows version updated to build under Visual Studio 2010 (including Express edition).
  • Unix/X11 version now supports X servers that don't support XWarpPointer.






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