A "microcomputer" is defined as a computer having no more than two
microprocessors used for general purpose processing within the computer.
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I prefer the term "Consumer Computer"
It is/was the kind of machine you buy in a retail store.
The term minicomputer originated in the early 70s to classifly a type
of sub $50000 computer that could be purchased by departments (as opposed
to having to go though corporate DP approval)
DEC and many others sold these types of computers earlier than the 70s,
but at the time they weren't called 'minicomputers'.
http://en.wikipedia.org/wiki/Minicomputer
has an interesting definition, though I disagree with
some of the claims made there.