It is based on U.C. Berkeley's
<quote>4.4BSD-Lite
</quote> release, with some
<quote>4.4BSD-Lite2
</quote> enhancements. It is also based indirectly on William Jolitz's port of U.C. Berkeley's
<quote>Net/2
</quote> to the
<trademark>i386
</trademark>, known as
<quote>386BSD
</quote>, though very little of the 386BSD code remains.