
Intel Desktop Board D955XCS Technical Product Specification 
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2Technical Reference 
2.1 Memory Resources......................................................................................................43 
2.1.1 Addressable Memory.....................................................................................43 
2.1.2 Memory Map..................................................................................................45 
2.2 DMA Channels.............................................................................................................45 
2.3 Fixed I/O Map...............................................................................................................46 
2.4 PCI Configuration Space Map......................................................................................47 
2.5 Interrupts......................................................................................................................48
2.6 PCI Conventional Interrupt Routing Map .....................................................................49 
2.7 Connectors...................................................................................................................51 
2.7.1 Back Panel Connectors.................................................................................51 
2.7.2 Component-side Connectors.........................................................................54 
2.8 Jumper Block ...............................................................................................................65 
2.9 Mechanical Considerations..........................................................................................66 
2.9.1 Form Factor...................................................................................................66 
2.9.2 I/O Shield.......................................................................................................67 
2.10 Electrical Considerations..............................................................................................69 
2.10.1 DC Loading....................................................................................................69 
2.10.2 Add-in Board Considerations.........................................................................69 
2.10.3 Fan Connector Current Capability.................................................................70 
2.10.4 Power Supply Considerations .......................................................................70 
2.11 Thermal Considerations...............................................................................................71 
2.12 Reliability......................................................................................................................73 
2.13 Environmental..............................................................................................................74 
2.14 Regulatory Compliance................................................................................................75 
2.14.1 Safety Regulations ........................................................................................75 
2.14.2 EMC Regulations...........................................................................................75 
2.14.3 European Union Declaration of Conformity Statement..................................76 
2.14.4 Recycling Considerations..............................................................................77 
2.14.5 Product Certification Markings (Board Level)................................................78 
3Overview of BIOS Features 
3.1 Introduction ..................................................................................................................79
3.2 Resource Configuration ...............................................................................................80 
3.2.1 PCI Autoconfiguration....................................................................................80 
3.2.2 PCI IDE Support............................................................................................80 
3.3 System Management BIOS (SMBIOS) ........................................................................81 
3.4 Legacy USB Support....................................................................................................81 
3.5 BIOS Updates..............................................................................................................82 
3.5.1 Language Support.........................................................................................82 
3.5.2 Custom Splash Screen..................................................................................82 
3.6 Boot Options ................................................................................................................83 
3.6.1 CD-ROM Boot ...............................................................................................83 
3.6.2 Network Boot.................................................................................................83 
3.6.3 Booting Without Attached Devices................................................................83 
3.6.4 Changing the Default Boot Device During POST..........................................83