Mouse Is Not Supported on COM3 or COM4

Last reviewed: February 15, 1997
Article ID: Q72394

The information in this article applies to:

Microsoft Windows operating system versions 3.0, 3.0a, 3.1, 3.11
Microsoft Windows for Workgroups versions 3.1, 3.11
Microsoft Windows 95

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

KBCategory: kbhw
KBSubcategory: win30 win31 wfw wfwg win95
Additional reference words: 3.0 3.0a 3.00 3.00a 3.1 3.10 3.11 pointing
device 95

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Last reviewed: February 15, 1997
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