System Overview
1-5
➊
On/Off button. Powers the system on or off. When the LED to the right of the
button is lit, the power is on. The On/Off button is connected to the power
supplies through the system interlock and the RCM logic.
➋
Reset button. Initializes the system.
➌
Halt button. When the Halt button is pressed, different results are manifest
depending upon the state of the machine.
The major function of the Halt button is to stop whatever the machine is doing
and return the system to the SRM console.
To get to the SRM console, for systems running OpenVMS or Compaq Tru64
UNIX, press the Halt button.
To get to the SRM console, for systems running Windows NT, press the Halt
button and then press the Reset button. (Pressing the Halt button when the
system is running Windows NT causes a “halt assertion” flag to be set in the
firmware. When Reset is pressed, the console reads the “halt assertion” flag and
ignores environment variables that would cause the system to boot.)
The function of the Halt button is complex; it depends upon the state of the
machine when the button is pressed. See Section B.1 for a full discussion of the
Halt button.