Dear SCO Customer,

Support Level Supplement (SLS) PTF7077A, the UnixWare 7.0.0 cram Driver Patch,
provides a new cram driver to partially address the problem of Real Time Clock
(RTC) drifts and CMOS corruption on UnixWare 7.0.0 operating systems.  The
problem exists due to multiple drivers accessing ports without sufficient
protection for mutual exclusion.

Once SLS PTF7077A is installed, the uts/svc/v86bios module functions
v86bios_eisa_read_func() and v86bios_eisa_read_slot() are modified to call
into the cram driver to lock and unlock access to the CMOS RAM before calling
BIOS functions that access the CMOS.

Note: SLS PTF7078A, the UnixWare 7.0.0 ca Driver Patch, is also required 
      for a complete solution.

The release notes displayed prior to installation can be found in:

       /var/sadm/pkg/ptf7077/install/ptf7077.txt



SLS PTF7077A contains:

        /etc/conf/mdevice.d/cram
        /etc/conf/pack.d/cram/Driver_atup.o
        /etc/conf/pack.d/cram/Driver_mp.o


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

SLS PTF7077A should only be installed on: 

        UnixWare 7.0.0


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

1. Download the ptf7077a.Z and ptf7077a.txt files to the /tmp directory on
   your machine.

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

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf7077a.Z
        # pkgadd -d /tmp/ptf7077a
        # rm /tmp/ptf7077a

3. Reboot the system after installing this SLS package.


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

1. As root, remove the SLS package using these commands:

        $ su
        Password: <type your root password>
        # pkgrm ptf7077

2. Reboot the system after removing this SLS package.


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