IBM Disable Secure Chip INF file
for Microsoft(R) Windows(R) XP
Installation Readme


This INF file has been created to recognize the National
Semiconductor TPM device by its plug-and-play signature.
This will fix the "Unknown Device" problem seen on systems
with an integrated TPM device and which cannot use the full
driver. It creates a hidden tree called "IBM Hidden Devices"
and a leaf called "Disabled Secure Chip".

This package applies to the following IBM systems configured
with the IBM Embedded Security Subsystem, sometimes referred
to as POV:

- ThinkCentre A51 (type 8424, 8425, 8428)
- ThinkCentre A51p (type 8420, 8421, 8422, 8423, 8426, 8427)
- ThinkCentre M51 (type 8095, 8141, 8142, 8143, 8144, 8145,
  8146)
- ThinkCentre S51 (type 8098, 8171, 8172, 8173)


Downloading the update
----------------------
1. Click the file link to download the file from the Web page.
2. When prompted, select a drive and directory in which to save
   the downloaded file.


Extracting the update
---------------------
1.  Click Start, select Find or Search, then click Files and
    folders.
2.  Type pz2z32usa.exe in the search field, then click Find Now.
    This will locate the file you just downloaded. 
3.  Double-click the pz2z32usa.exe icon.
4.  Click Next. Read the license agreement.
5.  Click I accept the terms in the license agreement.
6.  Click Next.
7.  Ensure that "Save files in folder" is set to
    C:\IBMTOOLS\DRIVERS\PZ2Z32US.
8.  Click Next. The necessary files will be extracted to your
    hard disk drive.
9.  Click Finish.


Installing the update
---------------------
1. Boot into Windows, clearing any "New Hardware Found"
   dialogs.
2. Copy notpm.inf from C:\IBMTOOLS\DRIVERS\PZ2Z32US into the
   C:\Windows\inf directory.
3. In Device Manager, right-click on any of the tree's and
   scan for hardware changes.
4. In the "New Hardware Found" dialog the device should be
   detected as "National TPM". Continue installation normally.
5. Reboot your system. At this point, the device is known and
   hidden in Device Manager as described above.


Uninstalling
------------
1. Delete "notpm.inf" and "notpm.pnf" in C:\Windows\inf
2. In Device Manager, after showing hidden devices, right-
   click and uninstall the "Disable Secure Chip" device in
   the "IBM Hidden Devices" tree.
3. Reboot your system. At this point, the device is again
   unknown.


Trademarks
----------
IBM, NetVista, and ThinkCentre are trademarks of the IBM
Corporation in the United States, other countries, or both.

Microsoft and Windows are trademarks of Microsoft Corporation
in the United States, other countries, or both.

Other company, product, and service names may be trademarks
or service marks of others.

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KIND. IBM DISCLAIMS ALL WARRANTIES, WHETHER EXPRESS OR
IMPLIED, INCLUDING WITHOUT LIMITATION, THE IMPLIED WARRANTIES
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(C) Copyright IBM Corporation 2005.  All rights reserved.