Microsoft KB Archive/147346

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

Article ID: 147346

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51

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This article was previously published under Q147346





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: kbhardware kbhw KB147346

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