Dell OptiPlex E1 - Manual (Page 38)

2-10 Dell OptiPlex E1 Mini Tower Managed PC Reference and Installation Guide
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Serial Port 1 and Serial Port 2 configure the system’s built-in serial ports. These
options can be set to Auto (the default option) to automatically configure a port, to a
particular designation (COM1 or COM3 for Serial
Port 1; COM2 or COM4 for Serial
Port 2), or to Off to disable the port.
If you set a serial port to Auto and add an expansion card containing a port configured
to the same designation, the system automatically remaps the built-in port to the next
available port 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).
‡
Likewise, COM2 (I/O address 2F8h), which shares IRQ3 with COM4, is
remapped to COM4 (I/O address 2E8h).
NOTES: When two COM ports share an IRQ setting, you can use either port as nec-
essary, but you may not be able to use them both at the same time. If the second
port (COM3 or COM4) is also in use, the built-in port is turned off.
If you are using the Microsoft Windows 95 or IBM OS/2 operating system, you cannot
use both serial ports at the same time.
For more information about built-in ports, port designations, IRQs, and the remapping
of ports, see “Connecting External Devices” in your online
System User’s Guide.
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Parallel Port configures the system’s built-in parallel port. This option can be set to
378h
(the default), to alternate addresses 278h or 3BCh, or to Off to disable the port.
NOTE: Do not set Parallel Port to 278h if you have an Enhanced Capabilities Port (ECP)
device connected to the port.
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Parallel Port Mode controls whether the system’s built-in parallel port acts as an
AT-compatible (unidirectional) or PS/2-compatible (bidirectional) port.
Your system also supports ECP mode, which can be used by Windows 95.
Windows 95 uses ECP protocol automatically if it detects an ECP-capable device,
eliminating the need for an ECP option in this option.
Set this option according to the type of peripheral device connected to the parallel
port. To determine the correct mode to use, see the documentation that came with
the device.
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IDE Drive Interface enables or disables the system’s built-in EIDE hard-disk drive
interface.
With Auto (the default option) selected, the system turns off the built-in EIDE inter-
face when necessary to accommodate a controller card installed in an expansion slot.