Microsoft KB Archive/157949

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Slow Keyboard Response on Some Windows 95-Based Computers

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Q157949

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The information in this article applies to:


 * Microsoft Windows 95

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SYMPTOMS
You may experience slow keyboard response on some Windows 95-based computers. When you are typing, characters may not appear on the screen for 3-4 seconds. The problem persists until you restart your computer.

CAUSE
This issue occurs due to a timeout set by Vpic.vxd (the Programmable Interrupt Controller virtual device) that is being canceled by Lpt.vxd.

RESOLUTION
This issue is resolved by the following updated file for Windows 95 and OSR2, and later versions of this file:

  LPT.VXD  version 4.00.954  dated 09/20/96  35,511 bytes

STATUS
Microsoft has confirmed this to be a problem in Microsoft Windows 95. An update to address this problem is now available, but is not fully regression tested and should be applied only to computers experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft does not recommend implementing this update at this time. Contact Microsoft Technical Support for additional information about the availability of this update.

This issue is resolved in Microsoft Windows 98.

MORE INFORMATION
This problem is often observed with Microsoft Office programs.

Computer models with which this problem has been observed include:


 * Compaq Deskpro/Prolinea Series 172029-00x
 * Compaq Prolinea 5100e (Compaq Designed ASIC)
 * Compaq Prolinea E Series FDC37C665GT (SMC Super I/O Chip)
 * Computers with Jade P133 motherboards

This problem has also been reported to occur on certain Toshiba computers that have the ECP port enabled. The problem has been reported on the following computers:


 * Toshiba T2450CT
 * Toshiba T400CD
 * Toshiba T430CD
 * Toshiba Tecra 700 CT

This problem has also been reported to occur if the port was configured for high speed bi-directional operation in the CMOS. You may be able to resolve this problem by setting the port to "normal" in the CMOS.

For information about additional issues resolved by updates to this component, please see the following articles in the Microsoft Knowledge Base:

Q157244 Program Cannot Share or "Steal" LPT Port in Windows 95

Q141919 Printing Problems with ECP Port

Q138714 Using the Windows Printing System with Windows 95

Q137152 Canon Bubble-Jet on ECP Port Prints Partial Page

Q132425 Extra Page Printed with Each Print Job

For additional information about Windows 95 updates, please see the following article in the Microsoft Knowledge Base:

"Q161020 Implementing Windows 95 Updates"

Additional query words: word95 word97 xl95 xl97

Keywords : kbhw kbpolicy win95

Issue type :

Technology : kbWin95search kbWin95