Dell Precision 420 - Manual (Page 17)

System Board Labels
Table 2 lists the labels for connectors and sockets on your system board, and it gives a brief description of their functions.
Table 2. System Board Connector and Socket Labels
RIMMs
Connector or Socket Label Description
AGP AGP graphics card slot
AUX_LED Hard-disk drive LED connector
Battery Battery socket
CD_IN CD-ROM audio interface connector
DISKETTE Diskette/tape drive interface connector
ENET Integrated NIC connector
EXT_SPKR External speaker connector
FAN_CCAG Card cage area fan power connector
FAN_SYS Microprocessor fan power connector
HD_LED Hard-disk drive
IDEn EIDE interface connector
KEYB Keyboard connector
LINE_OUT External speaker connector
LINE_IN Audio input connector
MIC Microphone connector
MONITOR Video connector
MOUSE Mouse connector
MPWR1 Main power 1 connector (desktop)
MPWR2 Main power 2 connector (desktop)
MTPWR1 Main power 1 connector (mini tower)
MTPWR2 Main power 2 connector (mini tower)
PANEL Control panel connector
PARALLEL Parallel port connector; sometimes referred to as LPT1
PCIn PCI expansion-card connector
POWER_1 Main power input connector
POWER_2 3.3-V power input connector
PROC_0 Primary microprocessor connector
PROC_1 Secondary microprocessor connector
RIMM_x RIMM socket
SCSI External SCSl port connector
SCSI_LVD Internal LVD SCSl connector
SCSI_NARROW Internal SCSl Narrow connector
SERIAL1/2 Serial port connectors
STANDBY_LED Standby power LED
STR_LED Suspend-to-RAM LED
USB USB connectors
TAPI Modem connector
WOL Remote Wakeup on LAN power connector