Acorn ABC 310

Acorn's ABC-310 was to be the flagship of the Acorn business computer range. As far as I can tell, the 310 is the rarest variant, and it is the only one to have no direct equivalent available via a 2nd Processor card. When the ABC range was dissolved, Acorn already had 2nd Processors (a method of adding a new CPU to the BBC, similar to adding a Z80 on a card to an Apple II, but very different in execution and with far more applications) - the 65C02, the Z80, the Acorn Scientific 16032 (1MB RAM, compared to 4MB in the Cambridge Workstation/ABC-210).