> I have an install of RPCEmu 0.9.4 on this PC, and that runs RISC OS 5.2n
> (5.29) at a satisfactory speed.
Yes but it still won't run Iris because, as the name suggests, it is
emulating a RiscPC! At best that will be a StrongARM emulation, which will
lack VFP, Thumb, and probably other processor features that Iris needs.
As others have suggested, the 4te or FOURtress are the fastest RO systems
at the moment, with the latter being particularly good value. (And tiny!
Great if you're short of desk space)