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Dell OptiPlex N Systems Service Manual
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
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 inter-
faces, 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 con-
nects 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 sys-
tem board.
power LED
PCI1
connector
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