Dell OptiPlex GX240 User Manual

Page 53

Advanced Features

– Mouse Port enables or disables the computer's integrated Personal

System/2 (PS/2)-compatible mouse port. Disabling the mouse

allows an expansion card to use interrupt request (IRQ)12.This

setting is used to control the use of this legacy device.

– Serial Port 1 and Serial Port 2 configure the computer's integrated

serial connectors. You can set these options to Auto (the default)

to automatically configure a connector, to a particular designation

(COM1 or COM3 for Serial Port 1; COM2 or COM4 for Serial

Port 2), or to Off to control the use of this legacy device or to

disable the connector.
If you set a serial connector to Auto and add an expansion card

containing a connector configured to the same designation, the

computer automatically remaps the integrated port to the next

available connector designation that shares the same IRQ setting

as follows:
COM1 (input/output [I/O] address 3F8h), which shares IRQ4

with COM3, is remapped to COM3 (I/O address 3E8h).
COM2 (I/O address 2F8h), which shares IRQ3 with COM4, is

remapped to COM4 (I/O address 2E8h).

NOTE:

When two COM connectors share an IRQ setting, you can use

either connector as necessary, but you may not be able to use them both at
the same time. If you are running the Microsoft

Windows

95 or IBM

OS/2

operating system, you cannot use both serial connectors at the

same time. If the second connector (COM3 or COM4) is also in use, the
integrated connector is turned off.

– Parallel Port configures the computer's integrated parallel

connector. Press to configure the Parallel Port options

explained in the following subsections.
Mode: You can set this option to PS/2, EPP, ECP, AT, or Off to

control the use of this legacy device or to disable the connector.

Set this option according to the type of device connected to the

parallel connector. To determine the correct mode to use, see the

documentation that came with the device.
I/O Address: This option determines the I/O address used by the

parallel connector and appears except when Mode is set to Off.

You can set I/O Address to 378h (the default), 278h, or 3BCh.

NOTE:

You cannot set the parallel connector to 3BCh if Mode is set to

EPP.