Intel Desktop Board DH61HO Technical Product Specification 
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2  Technical Reference 
2.1  Memory Resources ........................................................................... 35 
2.1.1  Addressable Memory.............................................................. 35 
2.1.2  Memory Map ......................................................................... 37 
2.2  Connectors and Headers .................................................................... 37 
2.2.1  Back Panel Connectors ........................................................... 38 
2.2.2  Component-side Connectors and Headers ................................. 39 
2.3  BIOS Configuration Jumper Block ....................................................... 47 
2.4  Mechanical Considerations ................................................................. 48 
2.4.1  Form Factor .......................................................................... 48 
2.5  Electrical Considerations .................................................................... 49 
2.5.1  Power Supply Considerations .................................................. 49 
2.5.2  Fan Header Current Capability ................................................ 50 
2.5.3  Add-in Board Considerations ................................................... 50 
2.6  Thermal Considerations ..................................................................... 51 
2.7  Reliability ........................................................................................ 53 
2.8  Environmental .................................................................................. 53 
3  Overview of BIOS Features 
3.1  Introduction ..................................................................................... 55 
3.2  System Management BIOS (SMBIOS) ................................................. 57 
3.3  Legacy USB Support ......................................................................... 57 
3.4  BIOS Updates .................................................................................. 58 
3.4.1  Language Support ................................................................. 58 
3.4.2  Custom Splash Screen ........................................................... 59 
3.5  BIOS Recovery ................................................................................. 59 
3.6  Boot Options .................................................................................... 60 
3.6.1  Optical Drive Boot ................................................................. 60 
3.6.2  Network Boot ........................................................................ 60 
3.6.3  Booting Without Attached Devices ........................................... 60 
3.6.4  Changing the Default Boot Device During POST ......................... 60 
4  Error Messages and Beep Codes 
4.1  Speaker .......................................................................................... 61 
4.2  BIOS Beep Codes ............................................................................. 61 
4.3  Front-panel Power LED Blink Codes ..................................................... 62 
4.4  BIOS Error Messages ........................................................................ 62 
4.5  Port 80h POST Codes ........................................................................ 63