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Using the System Setup Program 3-17
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Sound determines whether the integrated audio controller is On (the default) or Off.
When Sound is set to Off, no sounds are emitted from any attached external speakers
or from the on-board speaker, except for beep codes. Set Sound to Off if you want to
use a sound expansion card instead of the integrated audio controller or if you need
the resources used by the controller.
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The following user-selectable settings for the NIC option determine the state of the
integrated NIC:
On (PXE Off) — NIC is enabled but not set to boot the system remotely from the
Preboot eXecution Environment (PXE) on a network server.
On — NIC is enabled and PXE is set to allow the system administrator to update
the system remotely.
Off — NIC is disabled.
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Mouse enables or disables the system’s built-in PS/2-compatible mouse port. Dis-
abling the mouse allows an expansion card to use interrupt request (IRQ) 12.
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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) 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 built-in 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 built-in port is turned off.
For more information about built-in ports, port designations, IRQs, and the remapping
of ports, see “I/O Ports and Connectors” in Appendix B.
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