CPU System Overview
2.4 BA440 Enclosure Components
Table 2–3 (Cont.) H3604 Console Module Controls and Indicators
Control/Indicator
Function
Break Enable/Disable switch
When the switch is down (position 0), breaks are
disabled. When the switch is up (position 1), breaks
are enabled. When breaks are enabled, pressing
Break
on the console terminal halts the processor
and transfers control to the console program. Using
the console command SET CONTROLP, you can
specify the control character,
Ctrl/P
, rather than
Break
to initiate a break signal.
The Break Enable/Disable switch also controls
what happens at power-up. When breaks are
disabled (down, position 0), the system attempts
to automatically boot software at power-up. When
breaks are enabled (up, position 1), the system
enters console mode (indicated by the >>>prompt)
at power-up.
Using the console command, SET HALT REBOOT
or SET HALT RESTART_REBOOT, you can set
your system to automatically boot software after
the system is halted due to pressing
Break
.
Two DSSI bus node ID plugs
KA681/KA691/KA692/KA694-based systems have
two separate Digital Storage Systems Interconnect
(DSSI) buses. Two DSSI bus node ID plugs, one
for the internal DSSI bus, Bus 0, and one for the
external bus, Bus 1, identify the bus nodes of the
DSSI adapters, which are part of the CPU.
Two DSSI connectors for Bus 1
Two in/out DSSI connectors, labeled X and Y, on the
console module allow you to expand the system by
connecting additional mass storage devices to the
second DSSI bus. You can also share mass storage
devices with another system by forming a DSSI
VAXcluster configuration.
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2–12 CPU System Overview
