The one that I am familiar with (probably the oldest) is essentially a 286 self-contained on two interconnected nubus cards, complete with one whole meg of memory. When I had this installed in my quadra 700, I found it to be essentially useless. I mean it worked, but it wasn't good for anything. There were a number of other variations on this idea, emulating 386, 486, etc, but nobody makes them anymore, because emulation with just software on a PPC is much more effective. You can read more about these cards at macwindows.com
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