Here is an interesting review of the product:<p><a href="http://mikenaberezny.com/wp-content/uploads/2013/07/spartan-review-ahoy-sep-1986.pdf" rel="nofollow">http://mikenaberezny.com/wp-content/uploads/2013/07/spartan-...</a>
Not really an "emulator". It bolted on an entire Apple II-compatible system. Much like some of the earlier compatibility products (both the Amiga and Mac had expansions that added a whole-ass PC on the side, the Amiga product was an official Commodore one while the Mac addon was third-party).
> The Mimic Systems Spartan was an elusive bit of C-64 hardware that made it Apple II+ compatible.<p>Interesting... so, it was an emulator that required special hardware. I wonder if it allows the use of a z-80 card. If so the C-64 would be able to run CP/M making it a very versatile system.