Originally Posted by Stiletto
Is it a MAME first, or are other emulators this far or farther?
The only other Archimedes emulators are Arculator http://b-em.bbcmicro.com/arculator/ and RPCEmu http://www.marutan.net/rpcemu/, met the author a couple of months ago. This focuses on later models so doesn't support Risc OS 3, but Arculator does.

BBC Model B, ATPL Sidewise, Acorn Speech, 2xWatford Floppy Drives, AMX Mouse, Viglen case, etc.