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Using the System Setup Program 3-17
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Serial Port 1 and Serial Port 2 configure the system’s integrated serial ports. These
options can be set to Auto (the default) to automatically configure a port, to a particu-
lar designation (COM1 or COM3 for Serial Port 1 and 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 integrated port to the
next available port designation that shares the same IRQ setting:
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).
(Note that 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 integrated port is turned off.
For more information about integrated ports, port designations, IRQs, and the remap-
ping of ports, see “I/O Ports and Connectors” in Appendix B.
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Parallel Port configures the system’s integrated parallel port. Parallel Port can be set
to 378h, to alternate addresses 278h
or 3BCh, or to Off to disable the port.
The default is 378h; you should leave it at that setting unless an expansion card needs
to use that address.
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Parallel Mode controls whether the system’s integrated parallel port acts as an AT-
compatible (unidirectional) or PS/2-compatible (bidirectional) port.
Your system also supports Extended Capabilities Port (ECP) mode, which can be used
by the Windows 95 or Windows 98 operating system. Windows 95 and Windows 98
use the ECP protocol automatically if an ECP-capable device is detected.
Set Parallel Mode 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 Hard Disk enables or disables the system’s integrated EIDE hard-disk drive
interface.
With Auto (the default) selected, the system turns off the integrated EIDE interface
as necessary to accommodate a controller card installed in an expansion slot.