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CAUTION
Only the back panel USB, the front panel USB, VGA, and PS/2 connectors have overcurrent protection. The Intel® Desktop Board D845GRG's internal connectors are not overcurrent protected and should connect only to devices inside the computer's chassis, such as fans and internal peripherals. Do not use these connectors to power devices external to the computer's chassis. A fault in the load presented by the external devices could cause damage to the computer, the interconnecting cable, and the external devices themselves. Contents
Back Panel I/O Connectors The figure below shows the location of the back panel connectors. The back panel connectors are color-coded in compliance with PC 99 recommendations. The figure legend below lists the colors used. 
Item | Description | Color | A | PS/2 mouse port | Green | B | PS/2 keyboard port | Purple | C | USB port (optional) | Black | D | USB port (optional) | Black | E | Serial port A | Teal | F | Parallel port | Burgundy | G | VGA | Dark blue | H | USB port | Black | I | LAN (optional) | Black | J | USB port | Black | K | Mic in | Pink | L | Audio line out | Lime green | M | Audio line in | Light blue |
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Integrator's Note:
The back panel audio line out connector is designed to power headphones or amplified speakers only. Poor audio quality occurs if passive (non-amplified) speakers are connected to this output.
Internal I/O Connectors Audio, Power, and Hardware Control
The figure below shows the location of the audio, power, and hardware control connectors. 
Item | Description | A | Front audio panel | B | Auxiliary line in, ATAPI style (white) | C | Rear chasis fan | D | ATAPI CD-ROM (black) | E | +12V power connector (ATX12V) | F | Processor fan | G | Main power | H | Chasis intrusion | I | Front chasis fan |
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Add-in Board and Peripheral Interface Connectors The figure below shows the location of the add-in board connector and peripheral connectors. Note the following considerations for the PCI bus connectors: - All of the PCI bus connectors are bus master capable.
- SMBus signals routed to PCI bus connector 2. This enables PCI bus add-in boards with SMBus support to access sensor data on the Desktop Board. The specific SMBus signals are as follows:
- The SMBus clock line is connected to pin A40.
- The SMBus data line is connected to pin A41.
Item | Description | A | CNR (optional) | B | PCI bus connector 3 | C | PCI bus connector 2 | D | PCI bus connector 1 | E | AGP connector | F | Diskette drive | G | Primary IDE | H | Secondary IDE | I | SCSI LED |
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External I/O Connectors The figure below shows the location of the external I/O connectors. 
Item | Description | A | Auxilary front panel power/sleep/message-waiting LED | B | Front panel | C | Front panel USB |
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Front Panel Connector This section describes the functions of the front panel connector. The table below lists the signal names of the front panel connector. | Pin | Signal | In/Out | Description | Pin | Signal | In/Out | Description | | Hard Drive Ativity LED | Power LED | | 1 | HD_PWR | Out | Hard disk LED pull-up
(330 ohm) to +5 V | 2 | HDR_BLNK_GRN | Out | Front panel
green LED | | 3 | HAD# | Out | Hard disk active
LED | 4 | HDR_BLNK_YEL | Out | Front panel
yellow LED | | Reset Switch | On/Off Switch | | 5 | Ground | | Ground | 6 | SWITCH_ON# | In | Power switch | | 7 | FP_RESET# | In | Reset switch | 8 | Ground | | Ground | | 9 | +5 V | Out | Power | 10 | N/C | | Not connected |
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This applies to:
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