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
• RISC OS
• 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.

• ArcEm - The Acorn Archimedes Emulator
• Archimedes Emulator | Free System Administration software downloads at SourceForge.net

• ArcEm 1.50 alpha 2 [RISC OS] [ARM] Hits: 585 Size: 375 Kb
• ArcEm 1.50 alpha 2 [RISC OS] [Source Code] Hits: 568 Size: 1,35 Mb