Dear SCO Customer,

The enclosed Support Level Supplement (SLS) PTF3152C, the Multiple I/O
APICs Supplement, corrects a problem with any PCI controller card in
a multi-processor system with multiple I/O APICs.

The PCI network card that adds the second I/O APIC PCI bus no longer
worked after upgrading from SCO UnixWare 2.1.0 to UnixWare 2.1.1 or 2.1.2.
This occurred because the pcmp Driver.o on SCO UnixWare 2.1.1 and 2.1.2
is incompatible with multi-processor systems with multiple I/O APICs. 


Software Notes and Recommendations
----------------------------------

SLS PTF3152C should only be installed on SCO UnixWare Application Server
Release 2.1.1 or 2.1.2 with the following hardware configuration:

  - Motherboard that has multiple I/O APICs

  - Multi-processor system


Installation Instructions
-------------------------

1. Download the ptf3152c.Z and ptf3152c.txt files to the /tmp directory
   on your machine.

2. As root, uncompress the file and add the package to your
   system using these commands:

       $ su
       # uncompress /tmp/ptf3152c.Z
       # pkgadd -d /tmp/ptf3152c

3. Reboot the system after installing this SLS.


Removal Instructions
---------------------

1. As root, remove the package.

       $su
       # pkgrm ptf3152c

2. Reboot the system after removing this SLS.

If you have questions regarding this SLS, or the product on which it is
installed, please contact your software supplier.

We appreciate your business.

SCO Support Services