Dell OptiPlex 755 User's Guide - Page 100
Drives, Connectors, Internal USB - usb ports
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Drives Externally accessible Internally accessible one One eSATA drive (optional) • two SATA (Serial ATA) hard drives • one3.5-inch floppy drive or media card reader • one SATA optical drive Connectors External connectors: Serial 9-pin connector; 16550C-compatible Parallel 25-pin connector (bidirectional) Video 15-pin VGA connector Network adapter RJ45 connector Optional PS/2 with secondary serial two 6-pin mini-DINs port adapter USB two front-panel and six back panel USB 2.0-compliant connectors Audio two connectors for line-in/ microphone and line-out; two frontpanel connectors for headphones and microphone System board connectors: SATA three 7-pin connectors eSATA one 7-pin connector Internal USB 10-pin header for optional media card reader (in 3.5-inch drive bay) Floppy drive 34-pin connector Serial 12-pin connector for optional secondary PS/2 serial port card Fan 5-pin connector PCI Express one 120-pin (x16) connector PCI 2.3 two 120-pin connectors Front panel 40-pin connector 100 Desktop Computer Specifications