The system board, sometimes called the planar or motherboard, is the main circuit board in the system unit. It supports a variety of devices and provides other basic computer functions that are preinstalled or that you can install later. The system board shown on the previous page has the following parts:
1Memory module sockets (for DIMMs). Your system board has two 168- pin sockets labelled DIMM Bank 0 and DIMM Bank 1 for Dual lnline Memory Modules (DIMMs).The DIMM sockets support 3.3V
2Power Switch connector (J15)
3Processor fan power connector (J2)
4HDD LED and Power LED connector (J18)
5Primary IDE connector (J4). Holds signal cables that attach to IDE channel 1.
6Processor FAN, processor and heat sink (U5)
7Secondary IDE connector (J5). Holds signal cables that attach to IDE channel 2.
8Diskette drive connector (J14)
9Battery (BAT1) System battery.
10Flash ROM BIOS (U16)
11PCI adapter card connector (J11 - PCI SLOT1). This is the first PCI adapter card connector.
12PCI adapter card connector (J12 - PCI SLOT2). This is the second PCI adapter card connector.
13PCI adapter card connector (J13 - PCI SLOT3). This is the third adapter card connector.
14USB and Local Area Network Connector (J7)
15
16Audio and game port connector (J20)
17Power supply connecter (J1)
18Keyboard and mouse connectors (J17)
19Parallel, Video and Serial connectors (J16)
20Digital Flat Panel connector (J6)
21Front USB, headset, microphone, and volume control (J25) (for consumer desktop model only)
