Mouse Is Not Supported on COM3 or COM4 (72394)


The information in this article applies to:

  • Microsoft Windows for Workgroups 3.1
  • Microsoft Windows for Workgroups 3.11
  • Microsoft Windows 3.0
  • Microsoft Windows 3.1
  • Microsoft Windows 3.11
  • Microsoft Windows 95
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
Modification Type:MinorLast Reviewed:7/7/2005
Keywords:KB72394
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