Microsoft KB Archive/72394

= Mouse Is Not Supported on COM3 or COM4 =

Article ID: 72394

Article Last Modified on 7/7/2005

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APPLIES TO


 * Microsoft Windows for Workgroups 3.1
 * Microsoft Windows for Workgroups 3.11
 * Microsoft Windows 3.0 Standard Edition
 * Microsoft Windows 3.1 Standard Edition
 * Microsoft Windows 3.11 Standard Edition
 * Microsoft Windows 95

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This article was previously published under Q72394



SUMMARY
The Microsoft Mouse driver for Windows supports only the following communications ports:


 * InPort
 * Bus
 * PS/2
 * COM2
 * COM1

The Microsoft Mouse driver searches for a mouse in the order listed above.

Currently, there are no known Windows pointing-device drivers that support more than one pointing device, or a pointing device on COM3 or COM4.



MORE INFORMATION
COM3 and COM4 are not standardized across the industry. Industry Standard Architecture (ISA) machines do not support the sharing of IRQs. COM1 and COM3 share IRQ4, and COM2 and COM4 share IRQ3.

The following are the addresses for the Microsoft Mouse:   SERIAL MOUSE ============

Port Assignments   Address Ranges --  COM1                3F8H-3FFH COM2               2F8H-2FFH

BUS MOUSE (BUS INTERFACE BOARD SETTINGS) ========================================

Primary InPort Range 23CH-23FH

Secondary InPort Range --  238H-23BH

Additional query words: 3.0 3.0a 3.00 3.00a 3.1 3.10 3.11 pointing device

Keywords: KB72394

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