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CAUTION
Only the following connectors have overcurrent protection: back panel USB, front panel USB, and PS/2.
The other 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 power cable, and the external devices themselves.
This section describes the connectors and are divided into these groups:
- Back Panel I/O Connectors
- Internal I/O Connectors
- External I/O Connectors
Back Panel 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 ports | Black | | D | Serial port A | Teal | | E | Parallel port | Burgundy | | F | VGA port | Dark Blue | | G | LAN | Black | | H | USB ports | Black | | I | Audio line in | Light Blue | | J | Mic in | Pink | | K | Audio front left and right out | Lime green |
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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 The internal I/O connectors are divided into the following functional groups: - Audio
- Power and hardware control
- Add-in boards and peripheral interfaces
Audio Connectors The figure below shows the location of the audio connectors. 
| Item | Description | | A | Auxiliary line in, ATAPI style (white) | | B | ATAPI CD-ROM (black) | | C | Front panel audio |
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Power and Hardware Control Connectors The figure below shows the location of the power and hardware control connectors. 
| Item | Description | | A | Rear chassis fan | | B | +12 V power connector (ATX12V) | | C | Processor fan | | D | Main power | | E | Front chassis fan | | F | Chassis intrusion |
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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 for the Intel® Desktop Board D865PERC. Note the following considerations for the PCI bus connectors: - All of the PCI bus connectors are bus master capable.
- SMBus signals are 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 | PCI bus connector 3 | | B | PCI bus connector 2 | | C | PCI bus connector 1 | | D | AGP connector | | E | Diskette drive | | F | Primary Parallel ATA IDE (black) | | G | Secondary Parallel ATA IDE (white) | | H | SCSI hard drive activity LED (optional) | | I | Serial ATA connector 1 | | J | Serial ATA connector 0 |
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External I/O Connectors The figure below shows the location of the external I/O connectors. 
| Item | Description | Color | | A | Auxilary front panel power/sleep/message-waiting LED | Black | | B | Front panel | White | | C | Front panel USB | Black | | D | Front panel USB | Black |
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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. The figure below is a connection diagram for the front panel connector.
 Hard Drive Activity LED | Pin | Signal | In/Out | Description | | 1 | HD_PWR | Out | Hard disk LED pull-up (750 ohm) to +5 V | | 3 | HAD# | Out | Hard disk active LED |
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Power LED | Pin | Signal | In/Out | Description | | 2 | HDR_BLNK_GRN | Out | Front panel green LED | | 4 | HDR_BLNK_YEL | Out | Front panel yellow LED |
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Reset Switch | Pin | Signal | In/Out | Description | | 5 | Ground | | Ground | | 7 | FP_RESET# | In | Reset switch |
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On/Off Switch | Pin | Signal | In/Out | Description | | 6 | FPBUT_IN | In | Power switch | | 8 | Ground | | Ground |
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Power | Pin | Signal | In/Out | Description | | 9 | +5 V | | Power |
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Not Connected | Pin | Signal | In/Out | Description | | 10 | N/C | | Not connected |
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Front Panel USB Connector The figure below is a connection diagram for the front panel USB connector. INTEGRATOR'S NOTES - The +5 V DC power on the USB connector is fused.
- Pins 1, 3, 5, and 7 comprise one USB port.
- Pins 2, 4, 6, and 8 comprise one USB port.
- Use only a front panel USB connector that conforms to the USB 2.0 specification for high-speed USB devices.
This applies to:
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