AKCL 1-605 for Sequent PTX

[Jeff Dalton <jeff@aiai.edinburgh.ac.uk>]

I have ported AKCL 1-605 to a Sequent running their new OS, PTX.
(This is different from the Sequent port that was already part of
AKCL-1-605.)

There's also a fix to the general problem of operating systems where
you can't use FIONREAD to see if input is available but can use
select.

The files are available for ftp from skye-alter.aiai.ed.ac.uk 
(aka 192.41.104.6), user "anonymous", password your net address,
in direcectory

  /lisp/kcl/sequent-ptx

Jeff Dalton,                      JANET: J.Dalton@uk.ac.ed             
AI Applications Institute,        ARPA:  J.Dalton@ed.ac.uk
Edinburgh University.             UUCP:  ...!ukc!ed.ac.uk!J.Dalton