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Caution
On the Desktop Board D845PEBT2, only the following connectors have overcurrent protection:
Back panel USB, IEEE 1394a-2000, and PS/2
Front panel USB and IEEE 1394a-2000
The other internal connectors of the Desktop Board D845PEBT2 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 | IEEE 1394a-2000 port (optional) | Black | D | USB ports | Black | E | Serial port A | Teal | F | Parallel port | Burgundy | G | Digital S/PDIF (optional) | Orange | H | Optical S/PDIF (optional) | Black | I | Audio rear left and right out (for 6-channel audio only) | Black | J | Audio center and LFE out (for 6-channel audio only) | Black | K | Audio line in | Light blue | L | Front left and right out (for 6-channel audio);
Audio line out (for 2-channel audio) | Lime green | M | Mic in | Pink | N | LAN | Black | O | USB ports | Black |
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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 (nonamplified) speakers are connected to this output.
Internal I/O Connectors Power and Hardware Control Connectors CAUTION
The processor fan must be connected to the processor fan connector, not to a chassis fan connector. Connecting the processor fan to a chassis fan connector may result in onboard component damage that will halt fan operation. The figure below shows the location of the power and hardware control connectors. 
Item | Description | A | +12 V power connector (ATX12V)Fan 3 | B | Rear chassis fan | C | Processor fan | D | Main power | E | Chassis intrusion | F | Front chassis fan |
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Note:
Do not use a standard ATX power supply. The Desktop Board D845PEBT2 will not boot with a standard ATX power supply. Use only ATX12V-compliant power supplies with the Desktop Board D845PEBT2. ATX12V power supplies have an additional power lead that provides required supplemental power for the Intel® Pentium® 4 processor. The Desktop Board D845PEBT2 will not boot if the ATX12V power supply is not connected to both the 4-pin and 20-pin power connectors. Add-in Board and Peripheral Interface Connectors The figure below shows the location of the add-in board and peripheral connectors for the Desktop Board D845PEBT2. Note the following considerations for the PCI bus connectors: - All of the PCI bus connectors are bus master capable.
- The SMBus is routed to PCI bus connector 1 or 2 depending on the board's AA number labeled on the board's front right corner. This enables PCI bus add-in boards with SMBus support to access sensor data on the Desktop Board D845PEBT2. 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 5 | | C | PCI bus connector 4 | | D | ATAPI-style CD-ROM | | E | PCI bus connector 3 | | F | PCI bus connector 2 | | G | PCI bus connector 1 | | H | AGP | | I | Secondary IDE (white) | | J | Primary IDE (black) | | K | Diskette drive | | L | SCSI LED | | M | Secondary IDE RAID (blue) optional) | | N | Primary IDE RAID (blue) | | O | Primary SATA/SATA RAID (optional) | | P | Secondary SATA/SATA RAID (optional) |
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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 | Auxiliary front panel power/sleep/message-waiting LED | | C | Front panel USB (black) | | D | Front panel | | E | Front panel IEEE 1394a-2000 (white) (optional) |
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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. Front Panel Connector | 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 | | Power | 10 | N/C | | Not connected |
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For more information about the front panel connector, see the Intel® Desktop Board D845PEBT2 Technical Product Specification.
This applies to:
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