Dell Precision 370 - Manual (Page 21)

(2)
It is recommended that you use the front USB connectors for devices that you
connect occasionally, such as flash memory keys or cameras, or for bootable
USB devices.
9 USB 2.0
connectors
(4)
Use the back USB connectors for devices that typically remain connected,
such as printers and keyboards.
It is recommended that you use the front USB connectors for devices that you
connect occasionally, such as flash memory keys or cameras, or for bootable
USB devices.
10 microphone
connector
Use the pink microphone connector to attach a personal computer microphone
for voice or musical input into a sound or telephony program.
On computers with a sound card, the microphone connector is on the card.
11 keyboard
connector
If you have a standard keyboard, plug it into the purple keyboard connector.
If you have a USB keyboard, plug it into a USB connector.
12 serial
connector
Connect a serial device, such as a handheld device, to the serial port. The
default designations are COM1 for serial connector 1 and COM2 for the
optional serial connector 2.
For more information, see " System Setup Options ."
Inside View
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in
the Product Information Guide.