I/O Addresses for the Microsoft Mouse

 Last reviewed: September 16, 1996
Article ID: Q68110
The information in this article applies to:
  • Microsoft Mouse Driver for MS-DOS, versions 6.x, 7.x, and 8.x
  • Microsoft Mouse, version 1.0

SUMMARY

The following are the ranges in which an I/O (Input/Output) port assignment may occur for the Microsoft Mouse. The ranges are given in hexadecimal numbers, and the serial communications port assignments conform to the IBM standard I/O address range assignments for PCs and PS/2s. This information applies to the Microsoft Mouse for MS-DOS systems.

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

MORE INFORMATION

An I/O port acts as a doorway through which information travels. Information may originate from the CPU, travel over data and address buses, pass through the I/O port, and finally reach a peripheral device such as the mouse. Although the CPU recognizes various ports through 16-bit port numbers that range from 00H through FFFFH, the port address is not actually an address found in main memory. A port assignment is a memory location separate from a (main) memory address that is associated with that particular I/O port.

No other peripheral device, such as a modem or printer, may share the same I/O address with the mouse or the mouse may not function correctly.

KBCategory: kbhw
KBSubcategory:
Additional reference words: 6.x 7.x 8.x 8.00 8.10 8.20



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: September 16, 1996
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.