Dell Precision 330 - Manual (Page 21)

About Your Computer 21
NOTICE: When you disconnect external devices from the back of the
computer, wait 5 seconds after turning off the computer before you reconnect
any devices to avoid possible damage to the system board.
Serial Port Connectors
Default port designations: COM1 for serial port 1 and COM2 for serial port
2. You can reassign the serial port's designation in
system setup if you add an
expansion card containing a serial port using this designation.
If you set the system’s serial ports to Auto in system setup and add an
expansion card containing a serial port configured to a specific designation,
the computer automatically maps (assigns) the integrated ports to the
appropriate COM setting as necessary.
Before you add a card with a serial port, check the documentation that
accompanied your software to ensure that the software can be mapped to
the new COM port designation.
Parallel Port Connector
Used to connect printers. Default designation: LPT1.
NOTE: The integrated parallel port is automatically disabled if the system
detects an installed expansion card containing a parallel port configured to the
same address as specified in the Parallel Port option in
system setup .
Microphone Jack
Used to attach a standard personal computer microphone. Connect the
audio cable from the microphone to the microphone jack.
Line-Out/Speaker Jack
Used to attach computer speakers. This jack is amplified, so speakers with
integrated amplifiers are not required. Connect the audio cable from the
speakers to this jack.
Line-In Jack
Used to attach record/playback devices such as cassette players, CD players,
and VCRs. Connect the line-out cable from any of these devices to the line-
in jack.