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Caution
Only the back panel connectors and the front panel USB connector of the desktop board D850EMD2 have overcurrent protection. All of the remaining internal connectors on the desktop board D850EMD2 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. 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 | Serial port B | Teal | H | LAN (optional) | Black | I | USB port | 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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Note: The USB ports adjacent to the PS/2 ports are not populated if the USB 2.0 option is supported. Note: The back panel audio line out connector is designed to power headphones or amplified speakers only. Poor audio quality occurs if passive (nonamplified) speakers are connected to this output.
Internal I/O Connectors Audio The figure below shows the location of the audio connectors. 
Item | Description | Color | A | Auxiliary line in, ATAPI style | White | B | ATAPI CD-ROM | Black |
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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 | Chassis intrusion | B | ATX12V power | C | Processor fan | D | Fan 1 | E | Main power | F | Fan 2 |
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CAUTION
Use only an ATX12V-compliant power supply with these boards. ATX12V power supplies have two power leads that provide required supplemental power for the Intel® Pentium® 4 processor and the Intel® 850 chipset. Always connect the 20-pin and 4-pin leads of the ATX12V power supply to the corresponding connectors on the D850EMD2 board. Otherwise, the board and the processor could be damaged. Do not use a standard ATX power supply. Doing so could damage the board and the processor. Add-in Board and Peripheral Interface Connectors The figure below shows the location of the add-in board connectors and peripheral connectors. Note the following considerations for the PCI bus connectors: - All of the PCI bus connectors are bus-master capable.
- PCI bus connector 2 has SMBus signals routed to it which enables PCI bus add-in boards with SMBus support to access sensor data on the 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 | Diskettte drive | | G | Primary IDE | | H | Secondary IDE | | I | SCSI hard drive activity LED |
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External I/O Connectors The figure below shows the location of the external I/O connectors.  | Item | Description | | A | Front panel audio | | B | Front panel USB | | C | Auxiliary front panel power/sleep/message-waiting LED | | D | Front panel |
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Front Panel Connector The table below lists the signal names of the front panel connector. Front Panel Connector (J9D2) | Pin | Signal | In/Out | Description | Pin | Signal | In/Out | Description | | 1 | HD_PWR | Out | Hard disk LED pull-up (330 ohm) to +5V | 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 | | 5 | Ground | | Ground | 6 | FPBUT_IN | In | Power switch | | 7 | FP_RESET# | In | Reset switch | 8 | Ground | | Ground | | 9 | +5 V | Out | Reserved | 10 | N/C | | | | 11 | Reserved | In | Reserved | 12 | Ground | | Ground | | 13 | Ground | | Ground | 14 | (pin removed) | | Not connected | | 15 | Reserved | Out | Reserved | 16 | +5V | Out | Power |
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For more information about the front panel connector, see the Intel® Desktop Board D850EMD2/D850EMV2 Technical Product Specification.
This applies to:
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