Dell OptiPlex N Service Manual (.pdf) - Page 10

Expansion-Card Slot The computer has one PCI expansion-card connector on the riser board (see Figure 1-4). The computer automatically assigns any required memory space, IRQ lines, and DMA channels to an installed PCI expansion card during system start-up. The Wakeup On LAN power connector on the riser board supports an optional NIC expansion card with Wakeup On LAN capability. The power LED illuminates when DC power is applied to the riser board. Wakeup On LAN power connector Figure 1-4. Riser Board power LED PCI1 connector Hard-Disk Drive One 1-inch-high EIDE hard-disk drive can be mounted to the top of the expansion-card cage. Enhanced Dual-Interface EIDE Subsystem The EIDE subsystem provides two mode-4, DMA bus-mastered EIDE interfaces, each of which can support up to two EIDE devices. The EIDE controller attaches to the high-speed PCI local bus. Any attached EIDE device should be configured for the Cable Select jumper position. The computer's boot drive should be connected to the primary EIDE interface (IDE1). NOTE: Although the OptiPlex N system board supports up to four EIDE devices, no devices other than the internal hard-disk drive should be connected. Built-In Video Controller The video subsystem consists of a high-speed, high-resolution S3 Trio 64V2 86C785 video controller built into the system board. The video controller connects to the PCI bus, which operates at a frequency of 33 MHz. The built-in video controller includes 2 MB of video memory built into the system board. 1-4 Dell OptiPlex N Systems Service Manual