This is an old post, preserved for reference.
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A recent video by Dave Jones on his EEVBlog showed a tear down of an Acorn A3000 (I think they had officially dropped the Archimedes name at this point, but it is still sometimes referred to as an Archimedes 3000 or Archimedes A3000). The one Dave had suffered from what is sadly a common fault on this range of machines (and things like the Commodore Amiga A501), that of battery leaking and damaging the boards. Knowing this often wrote off the boards, I had been looking for a cheap A3000 that looked good externally, but where the main board was shot. My plan was to 'upgrade' the ARM2 processor to the ARM11 of a Raspberry Pi. I was going to convert the keyboard (like my other USB keyboards) and run RISC OS on it, so externally, it would look like an A3000, just inside would be the pi rather than the A3000.