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OpenVMS AXP operating system
Digital's open version of the VMS operating system, which runs
on Alpha AXP machines. See also open system.
operating system mode
The state in which the system console terminal is under the
control of the operating system software. Also called program
mode.
operator control panel
The panel on the top right side of the DEC 4000 AXP system
that contains the power, Reset, and Halt switches and system
status lights.
PALcode
Alpha AXP Privileged Architecture Library code, written
to support Alpha AXP processors. PALcode implements
architecturally defined behavior.
power-down
The sequence of steps that stops the flow of electricity to a
system or its components.
power system controller (PSC)
One of four units in the DEC 4000 AXP power supply subsystem.
The H7851AA PSC monitors signals from the rest of the system
including temperature, fan rotation, and DC voltages, as well
as provides power-up and power-down sequencing to the DC-DC
converters and communicates with the system CPU across the
serial control bus.
power-up
The sequence of events that starts the flow of electrical current
to a system or its components.
primary cache
The cache that is the fastest and closest to the processor.
processor module
Module that contains the CPU chip.
Glossary–9
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