I/O Addresses for the Microsoft Mouse (68110)
The information in this article applies to:
This article was previously published under Q68110 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.
| Modification Type: | Major | Last Reviewed: | 12/11/2001 |
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| Keywords: | KB68110 |
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