Emergency Management Services
Encyclopedia
Emergency Management Services (EMS) provides an RS-232
RS-232
In telecommunications, RS-232 is the traditional name for a series of standards for serial binary single-ended data and control signals connecting between a DTE and a DCE . It is commonly used in computer serial ports...

 accessible serial console interface to the bootloader menu on modern versions of Microsoft Windows
Microsoft Windows
Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...

.

During system installation of Windows Server 2003
Windows Server 2003
Windows Server 2003 is a server operating system produced by Microsoft, introduced on 24 April 2003. An updated version, Windows Server 2003 R2, was released to manufacturing on 6 December 2005...

, EMS is enabled per default in case BIOS
BIOS
In IBM PC compatible computers, the basic input/output system , also known as the System BIOS or ROM BIOS , is a de facto standard defining a firmware interface....

 serial console redirection is supported and enabled beforehand. Otherwise, and in Windows XP
Windows XP
Windows XP is an operating system produced by Microsoft for use on personal computers, including home and business desktops, laptops and media centers. First released to computer manufacturers on August 24, 2001, it is the second most popular version of Windows, based on installed user base...

, it is enabled with a command such as the following:

bootcfg /ems on /port com1 /baud 9600 /id 1

On Windows Vista
Windows Vista
Windows Vista is an operating system released in several variations developed by Microsoft for use on personal computers, including home and business desktops, laptops, tablet PCs, and media center PCs...

 it is enabled by typing the following command where {default} is the OS entry in BCDedit:

BCDedit /bootems {default} ON

In Windows Vista
Windows Vista
Windows Vista is an operating system released in several variations developed by Microsoft for use on personal computers, including home and business desktops, laptops, tablet PCs, and media center PCs...

 the serial port settings, Baud rate and Port ID, are accessed and modified using the following command:

BCDedit /emssettings EMSPORT:(port) EMSBAUDRATE:(rate)

On Windows Server 2003, this also starts a system console named Special Administration Console (SAC) during operating system
Operating system
An operating system is a set of programs that manage computer hardware resources and provide common services for application software. The operating system is the most important type of system software in a computer system...

 run time providing headless server operation.

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