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Early ARM processors had a combined 26-bit program counter and status register, rather than separate 32-bit program counter and status registers.
For a time processors had both 26-bit and 32-bit modes, with the former being phased out by ARM. In October 2002 RISC OS 5 was released using only the 32-bit mode, required because 26-bit mode processors were no longer available – the last being the StrongARM used in the RiscPC.
Most software written in BBC BASIC has no compatibility issues, and in many cases software written in C merely requires a recompilation of the source code, where available. However, some software is reliant on a features specific to 26-bit mode and needs updating before it will work.
Recent developments have made RISC OS 5 available for the RiscPC (StrongARM/ARM610/ARM710) and A7000/A7000+ (ARM7500/ARM7500FE).
A ROM upgrade is available to install on real hardware. The following installation notes will allow you to run RISC OS 5 on an emulated RiscPC, and assumes an installation on the most common user hardware/software installation – x86 hardware and Windows.
These notes are based on testing
Note 1: RISC OS 5 beta versions are updated frequently with nightly builds from the CVS but may contain bugs so important data should only be trusted to the stable installs.
Note 2: RPCEmu is deemed alpha quality by its authors, which rather negates any comments about stable installs in note 1. In practice, many people use RPCEmu without issue.
Note 3: If you choose to use a beta ROM it is best to use the matching beta HardDisc4 as changes in the ROM many require specific disc based components.
Details coming soon.
The combination of RPCEmu and RO5.2x on XP has been in daily use from 24/10/2013 (two months as at 2013-12-28).
For the author this follows a previous install of 0.8.10 upgraded from 0.8.9 with RO5 in use from early 2012
Note 1: RISC OS 5 beta versions are updated frequently with nightly builds from the CVS but may contain bugs so important data should only be trusted to the stable installs.
Note 2: RPCEmu is deemed alpha quality by its authors, which rather negates any comments about stable installs in note 1. In practice, many people use RPCEmu without issue.
If you have no need for networking stop here. (details coming soon)