From Donald E. Knuth's MMIX page:
MMIX is a RISC computer designed by the author to illustrate
machine-level aspects of programming. In the next editions of his
books The Art of Computer Programming, MMIX will replace the
1960s-style machine MIX.
More details can be found in his book:
MMIXware: A RISC Computer for the Third Millennium, by Donald E. Knuth
(Heidelberg: Springer-Verlag, 1999), viii+550pp. ISBN 3-540-66938-8.
(Lecture Notes in Computer Science, no. 1750.)
WWW: http://mmix.cs.hm.edu/
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