DEC VAX 4000 300 Manual page 23

Run Mode (in the middle position, indicated by an arrow)
is the normal operating setting.
Loop Back Test Mode (in the bottom position, indicated by
a T in a circle) causes the system to run loopback tests on
the console serial line at power-up. This setting requires
special loopback connectors and is for Digital Customer
Services use only.
Baud Rate Select switch — The Baud Rate Select switch is
used to set the system's baud rate to match that of the console
terminal. The factory setting is position 5 (9600).
Modified modular jack (MMJ) — This console terminal connector
provides the connection for the console terminal.
The light-emitting diode (LED) display shows the testing
sequence during power-up.
Break Enable/Disable switch — When the switch is down
(position 0), breaks are disabled. When the switch is up (position
1), breaks are enabled.
on the console terminal halts the processor and transfers
Break
control to the console program. Using the console command
, you can specify the control character,
CONTROLP
to initiate a break signal.
Break
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,
, you can set your system to automatically boot
RESTART_REBOOT
software after the system is halted due to pressing
Bus node ID plugs — VAX 4000 systems have two separate
Digital Storage System Interconnect (DSSI) busses. 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 node of the
When breaks are enabled, pressing
Ctrl/P
SET HALT REBOOT
System Overview
SET
, rather than
or
SET HALT
.
Break
1–13