Dell OptiPlex E1 - Manual (Page 56)

Connector or Socket Description
AMC ATI multimedia channel connector
BATTERY Battery socket
CD_IN CD-ROM audio interface connector
DIMM_x DIMM socket
DSKT Diskette/tape drive interface connector
ENET Integrated NIC connector
FAN Microprocessor fan connector
HDLED Hard-disk drive LED connector (on riser board)
IDEn EIDE interface connector
INTRUSION Chassis intrusion switch connector
ISAn* ISA expansion-card connector (on riser board)
KYBD Keyboard connector
LINE-IN Audio line-in jack (optional)
LINE-OUT Audio line-out jack (amplified source; optional)
MIC Microphone jack (optional)
MONITOR Video connector
MOUSE Mouse connector
P1 Wakeup On LAN power connector (on riser board)
PANEL Control panel connector
PARALLEL Parallel port connector; sometimes referred to as LPT1
PCIn* PCI expansion-card connector (on riser board)
POWER_1 Main power input connector
POWER_2 3.3-V power input connector
RISER Riser board connector
SERIALn Serial port connector
SLOT1 Microprocessor connector
USB USB connectors
VIDEO_UPGRADE Video-memory upgrade socket
* Connector ISA1 shares a single card-slot opening with PCI2. Only one connector at a time can be used on a shared card-slot