Select the SA110 (StrongArm) processor option, select 256MB RAM, and 2MB VRAM.Ignore the TaskManager error and click on the RPCEmu item in the menu bar and then Preferences….A dialogue box will appear, asking you to choose a data directory – choose the RPCEmu folder created earlier.

Open the Applications folder and double-click on the RPCEmu-Recompiler icon to launch it (you may need to right-click and choose Open for the first time, as newer versions of macOS try to discourage running potentially unsafe code).Note 3: If you choose to use a beta ROM it is best to use the matching beta HardDisc4 as changes in the ROM may require specific disc based components. In practice, many people use RPCEmu without issue. Note 2: RPCEmu is deemed alpha quality by its authors, which rather negates any comments about stable installations in note 1.

Note 1: RISC OS 5 beta versions are updated frequently with nightly builds from the Git repository but may contain bugs, so important data should only be trusted to the stable installs.

Copy this file to Documents/RPCEmu/hostfs as “HardDisc4-util,ffc” – take care to keep the ,ffc (comma ffc) ending which will be translated by RPCEmu to produce the metadata filetype for RISC OS.

The recommended version is labelled HardDisc4 (self-extracting) – this should give you a file called “HardDisc4.5.28.util”.

Download a HardDisc4 image from the Miscellaneous downloads page.

The other files aren’t needed and can be discarded.

Unpack the ROM archive and copy the file “riscos” from /soft/!Boot/Choices/Boot/PreDesk/!!SoftLoad/riscos into the Documents/RPCEmu/roms directory.

The recommended ROM is labelled IOMD 5.28 stable (softload).

Download an IOMD ROM image from the downloads page.

Documents/RPCEmu) and copy the contents of the “Data” directory from the RPCEmu distribution archive.

Create a data folder within your Documents folder (e.g.

Open the zip archive, and copy the applications “RPCEmu-Interpreter” and “RPCEmu-Recompiler” to the Applications folder (either drag them over the Applications entry in the Finder sidebar, or onto the Applications folder on the dock).

Download the zip archive of RPCEmu 0.9.3a – be sure to get the ZIP archive, not the DMG package.

If you have an older version of RPCEmu already installed, see Upgrading from an older version of RPCEmu below. This build is known to work on macOS Mojave (10.14), macOS Catalina (10.15) and macOS Big Sur (11.2). If you wish to run legacy programs then a software compatibility tool called Aemulor can assist in running 26 bit applications in a 32 bit operating system.Ī development build of RPCEmu 0.9.3 for 64-bit versions of macOS is now available. Note: If you wish to run RISC OS 5.2x any legacy applications with 26 bit code will first need updating.

Mac os x emulator