Yes, the plain A1200 model uses 680ec20, and the other model uses a “full” 68020 CPU. The difference is that the 680ec20 has only 24 address lines, and can therefore only address a 16MB memory space. You need to use the “full” 68020 CPU if you want to use Zorro III fast memory or enable the Zorro III uaegfx.card (“Picasso96″). I’m not aware of any other differences.
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