Dell OptiPlex GX50 User Manual page 57

NOTE:
When two COM ports share an IRQ setting, you can use either
port 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 ports at the same time. If the
second port (COM3 or COM4) is also in use, the integrated port is turned
off.
Parallel Port configures the computer's integrated parallel port. Press
<Enter> 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 port. Set this
option according to the type of device connected to the parallel
port. 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 port 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 port to 3BCh if Mode is set to EPP .
DMA Channel: This option determines the direct memory access
(DMA) channel used by the parallel port and appears only when
Mode is set to ECP . The available options are DMA 1, DMA 3,
and Off.
– IDE Drive Interface: enables or disables the computer's
integrated enhanced integrated drive electronics (EIDE) hard
drive interface. With Auto (the default) selected, the computer
turns off the integrated EIDE interface when necessary to
accommodate a controller card installed in an expansion slot. As
part of the boot routine, the computer first checks for a primary
hard drive controller card installed in an expansion slot. If no card
is found, the computer enables the integrated EIDE interface to
use IRQ14 and IRQ15. If a primary controller is detected on the
expansion bus, the integrated EIDE interface is disabled.
Selecting Off disables the integrated EIDE interface.
– Diskette Interface: controls the operation of the computer's
integrated floppy drive controller. With Auto (the default)
selected, the computer turns off the integrated floppy drive
controller when necessary to accommodate a controller card
installed in an expansion slot.
Ad v a n c ed Fe a tu r e s
55