Dear SCO Customer,

Support Level Supplement (SLS) ptf4058a, the SCO UnixWare 2.1.2 and 2.1.3 
lp Driver Supplement, addresses the following problem:

1. Printing via the parallel port is extremely slow. (This is especially
   know to occur on some Compaq systems.)

   There is a timing issue between the response from some printers on the
   parallel port and the retry wait loop code. This causes the printer to
   go into a wait after each character is printed.

   This has been resolved by creating a configurable wait tunable,
   lp_parallel_wait, which is present in a new lp space.c. This allows 
   the tuning of a wait time before going into the retry wait loop.

   The value of lp_parallel_wait can range from 80 to 1000000 (one second). 
   It will be necessary to experiment with this value to restore normal 
   printing speed.


Contents
--------

        /etc/conf/pack.d/lp/Driver_atup.o
        /etc/conf/pack.d/lp/Driver_mp.o
        /etc/conf/pack.d/lp/space.c


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

ptf4058 should only be installed on:

        SCO UnixWare Application Server Release 2.1.2, 2.1.3
        SCO UnixWare Personal Edition Release 2.1.2, 2.1.3


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

1. Download the ptf4058a.Z file to the /tmp directory on your machine.

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

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf4058a.Z
        # pkgadd -d /tmp/ptf4058a
        # rm /tmp/ptf4058a

Alternatively, this SLS package may be installed in quiet mode, 
that is, without displaying the release notes and asking for 
installation confirmation.  To do this, use these commands:

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf4058a.Z
        # pkgadd -qd /tmp/ptf4058a all
        # rm /tmp/ptf4058a

3. Reboot the system after installing this package.

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

        /var/sadm/pkg/ptf4058/install/ptf4058.txt


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

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

        $ su
        Password: <type your root password>
        # pkgrm ptf4058

2. Reboot the system after removing this package.


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