Dear SCO Customer, 

Enclosed is Support Level Supplement (SLS) unx318.  This SLS provides a new
serial driver for SCO UNIX System V/386 Release 3.2 Operating System Version 
2.0 and SCO Open Desktop Release 1.1 for computers based on Micro Channel 
Architecture (MCA). This new driver addresses problems with system panics 
that may be experienced when using non-intelligent serial multiport cards.  
SLS unx318 should ONLY be applied to systems running SCO UNIX System V/386 
Release 3.2 Operating System Version 2.0 or SCO Open Desktop Release 1.1 for 
computers based on Micro Channel Architecture (MCA).

Following are instructions for the installation of SLS unx318:

(1) Bring the system into System Maintenance mode. 
   
(2) Type the following commands after the system prompt:

       	# cd /
	# /etc/custom
  
	(do not type the "#", this is the system prompt)

(3) Choose "Install".  Then choose "A New Product".  Next choose 
    "Entire Product".  Insert the Micro Channel Serial Driver Enhancement 
    disk and choose "Continue".  After driver backup, press any key to 
    continue.  At this point, choose "Continue" again.  It is not necessary 
    to remove the Micro Channel Serial Driver Enhancement disk.  
 
(4) Answer "y" to the question about relinking a new kernel.  Answer "y" to 
    the question about allowing the kernel to boot by default.  You will also 
    want to answer "y" to the question about rebuilding the kernel environment.
    Press any key to continue after the kernel relink has completed.  

(5) After the kernel relink completes, choose "Quit" to exit custom.  At this 
    point, type the following to reboot your system:

	# /etc/shutdown 

	(do not type the "#", this is the system prompt)

(6) Installation of the Micro Channel Serial Driver Enhancement is now 
    complete. 

Following are instructions for the removal of SLS unx318:

If you want to restore the previous serial drivers on the system, use the 
following procedure: 

(1) Bring the system into System Maintenance mode. 

(2) Type the following: 

        # cd /
	# /etc/custom
        
	(do not type the "#", this is the system prompt)

(3) Choose "Remove".  Then choose "Micro Channel Serial Driver Enhancement". 
    Next choose "ALL".  Choose "Yes" to continue. 
 
(4) Answer "y" to the question about relinking a new kernel.  Answer "y" to 
    the question about allowing the kernel to boot by default.  You will also 
    want to answer "y" to the question about rebuilding the kernel environment.
    Press any key to continue after the kernel relink has completed.  

(5) After the kernel relink completes, choose "Quit" to exit custom.  At this 
    point, type the following to reboot your system:

	# /etc/shutdown 

	(do not type the "#", this is the system prompt)

(5) At this point, the serial drivers have been restored to their original 
    configuration. 

NOTE: In order to determine if SLS unx318 is currently installed, run "custom" 
      to view Products Currently Installed. 

If you have any questions, please call our SCO Customer Services Department
at (800) 347-4381.  SCO Customer Service is available Monday through Friday,
6:00 A.M. to 5:00 P.M., Pacific Time.

We appreciate your business

SCO Support Services