Henry Massalin's Synthesis _(kernel), the first of the modern *(OS) that dynamically generated code at runtime. Although it was written in MC68000 _(assembly), it opened the path to projects like _(Aegis) and _(Synthetix).

See a <A HREF="http://www.cs.columbia.edu/~library/TR-repository/reports/reports-1992/cucs-039-92.ps.gz"
  >paper</A> which discuss it.

See also _(Dynamism), _(Code Generation).
