This is what worries me the most about open source, it will be subverted in to pointless exercises instead of doing something useful to move the OS forward. It is a complete waste of time to port RO5 back to the Risc PC, there is no need for one version of the OS to run on everything, as there is nothing to be gained. Not one additional application will run on a Risc PC because it has RISC OS 5 (and indeed many thousands of 26bit applications will be broken buy it). The only applications that are RISC OS 5 only, are that way because they depend on Iyonix hardware. Familiarity with the HAL and driver model will come with experience of porting it to useful new hardware, not wasting valuable development time reinventing a decidedly square wheel on the Risc PC.