Dell OptiPlex 755 User Manual page 177

Drives
Externally accessible
Internally accessible
Connectors
External connectors:
Serial
Parallel
Optional PS/2 with secondary serial
port adapter
Video
Network adapter
USB
Audio
System board connectors:
internal USB
SATA
eSATA
Floppy drive
Serial
Fan
PCI 2.3
PCI Express
Front panel
one bay for a slimline floppy drive;
one bay for a slimline optical drive
one bay for a 1-inch-high hard drive
9-pin connector; 16550C-compatible
25-pin connector (bidirectional)
two 6-pin mini-DINs
NOTE:
This option uses the PCI slot.
15-pin VGA connector
RJ45 connector
two front-panel and six back panel USB 2.0–compliant connectors
two connectors for line-in/ microphone and line-out; two front-
panel connectors for headphones and microphone
10-pin header for optional media card reader (in 3.5-inch drive bay)
two 7-pin connectors
one 7-pin connector
34-pin connector
12-pin connector for optional secondary serial port card
two 5-pin connectors
one 120-pin connector
one 164-pin (x16) connector
40-pin connector
Small Form Factor Computer Specifications
177