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Q147346: Event ID 28 from 8042prt on IBM PS/2 and Some PC Servers

Article: Q147346
Product(s): Microsoft Windows NT
Version(s): 3.5 3.51
Operating System(s): 
Keyword(s): kbhw kbHardware
Last Modified: 08-AUG-2001

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The information in this article applies to:

- Microsoft Windows NT Workstation versions 3.5, 3.51 
- Microsoft Windows NT Server versions 3.5, 3.51 
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SYMPTOMS
========

Windows NT logs the following error in the System Log (as seen in the Event
Viewer) following a reboot:

  Source: 8042prt
  Type: Information
  Category: None
  Description: Could not successfully write the Controller Command Byte for the
  i8042.

CAUSE
=====

The Windows NT initialization routine reads the Controller Command Byte (CCB)
from the i8042prt, changes some CCB bits, writes it back, then verifies it. If
the verification does not pass, the error is posted in the System Log. The
keyboard driver also logs this error when it encounters glitches in operation.

This is by design and a valuable tool to determine problems when the keyboard
actually stops working.


RESOLUTION
==========

This is an informational message only and not an indication of a problem with
the keyboard port.

STATUS
======

Microsoft has confirmed this to be a problem in Windows NT version 3.5 and 3.51
We are researching this problem and will post new information here in the
Microsoft Knowledge Base as it becomes available.

Additional query words: prodnt
======================================================================
Keywords          : kbhw kbHardware 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNT351search kbWinNT350search kbWinNTW350 kbWinNTW350search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS351 kbWinNTS350 kbWinNTS351search kbWinNTS350search
Version           : 3.5 3.51

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