🚀 go-pugleaf

I have recently managed ot get Emacs 18.59 working on a buddy's SCO system,
and have a problem wherein if an incorrect or null response is given to
some off the M-x functions (such as load-file) Emacs hangs and seems to go
pretty crazy.  Bells will ring and "select error: Invalid Argument" or
another appropriate error message is displayed.  This is interesting in
that it also seems to hang the DOS box I am phoning from.  (I am doing all
this over the phone, if that makes a difference.)  I cannot hang up the
phone (via software) or do anything else with this machine except re-boot. 
Sometimes I can suspend the Emacs process and then kill it, but not often.
I don't know what other clues I can provide....  SCO version 3.2 4.2... a
earlier devleopment set (3.2 3.2?)
 Anyway, after all this, I understand there is a patch somewhere out there
for this and another machine (HPUX?) that had a similar problem.
 Is theere an archive for such patches?  Does this sound familliar to
anyone?  Any help appreciated....

                                           Thanks,
                                           Dave Chapman
                                           ag970@freenet.carleton.ca