XINU by Douglas Comer. Who distributes the source?

[M.CAIN]

One of the guys who works for me brought XINU up on
a Heurikon 68000 board.  He had some lengthy phone
conversations with the author of the book, who says
that the code proper is "public domain and not copyrighted".
Rather than go to the hassle of trying to order the tape,
he spent several evenings typing the source in manually.
While tedious, it worked, and he is currently running
several interesting digital signal processing applications
under XINU.

Michael Cain
Bell Communications Research, Inc.