Mouse Races and Jumps Across Screen

 Last reviewed: May 9, 1997
Article ID: Q103332

The information in this article applies to:
  • Microsoft Windows NT operating system, version 3.1
  • Microsoft Windows NT Advanced Server, version 3.1

SYMPTOMS

Your mouse pointer races across the screen in sudden bursts. It is difficult to control and often goes beyond what you aim for.

CAUSE

You have a serial mouse connected to a port based on the 16550 UART chip. The port adapter or motherboard uses hardware buffering rather than software buffering; and, the buffer is turned on. The mouse races because the hardware buffer is caching mouse movements and releasing them to the mouse driver in blocks. The mouse driver interprets these streams of movements as accelerated input and drives the mouse pointer accordingly.

RESOLUTION

Disable the hardware buffering for the serial port the mouse is connected to, or choose a different port.

Additional query words: prodnt mouse-rodeo
Keywords : kbhw nthw
Version : 3.1
Platform : WINDOWS

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Last reviewed: May 9, 1997
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.