Specifications

AlphaServer 1000A Owner's Guide Basic Operation • 4-21
Table 4-3 Startup and Boot Environment Variables
Operating
System
Environment
Variable
Value Description
Digital UNIX
OpenVMS
Alpha
auto_action
Boot
Halt
Restart
*Specifies the system default startup action. Applies
only to the Digital UNIX and OpenVMS Alpha
operating systems.
Digital UNIX
OpenVMS
Alpha
bus
_
probe
_
algorithm
New *Improves bus sizing and configuration on systems
running the Digital UNIX and OpenVMS operating
systems. Failure to set this environment variable could
result in errors.
Windows NT
autoload
Yes or No Specifies whether the Windows NT operating system
should boot. Does not affect the OpenVMS Alpha or
Digital UNIX operating systems. If the value is YES,
the Windows NT firmware boots the system after the
COUNTDOWN time-limit expires. If the value is NO,
the system halts at the Windows NT firmware Boot
menu.
Windows NT
countdown
10 seconds
(default value)
Specifies the time limit within which you can stop the
Windows NT operating system from booting if
AUTOLOAD is set to YES. The time limit is specified
in seconds. When you turn on the system or reinitialize
the firmware, the system displays the seconds
remaining before the operating system boots
automatically. To stop the system from booting
automatically, you must choose another menu item
from the Boot menu.
Windows NT
Digital UNIX
OpenVMS
Alpha
os_type
NT
UNIX
VMS
*Specifies the system default operating system setting.
Depending on the value, the system either boots or
restarts the specified operating system, or halts in the
specified console. You can modify the value from
either the Windows NT (ARC) console or Digital
UNIX and OpenVMS (SRM) console.