fwibbler: I doubt 512MB would be feasible due to the parts needed - you need to use very dense RAM as the CPU module is so tiny. Perhaps 256MB. I think if you look at it as a CPU and RAM upgrade, you could use the approximate prices of RiscPC upgrades as a guide. Say, perhaps the cost of a 710 upgrade and a 64MB SIMM? If you take the costs of back then, adjust for inflation, and apply Moore's law, you end up with a price around 150-200 quid. Give the list price for something very similar to what the A9 already has ([link]) is 115 quid, I don't think 150-200 quid would be unreasonable, given you'd need to also pay for work to be done to RISC OS to support the new CPU, as well as to send your A9 back to Advantage 6, as it is not user-serviceable.