Technical information
1.3 Power-On
At
power-on,
the
console
program
determines
the
console device
type
and
console language,
then
runs
the
self-tests for
the
CPU
and
memory. You
choose
the
console
language
when
you perform
the
set-up operations
during
your
console
terminal
installation
procedure.
You determine
the
type
of
power-on mode by
setting
the
Power-On Mode
switch on
the
CPU
console module. See
your
VAX 4000 Dual-Host Systems
manual
for
the
following power-on information:
• Power-on procedures
• Power-On Mode
and
Break
Enable1Disable switch
settings
•
Examples
of successful power-on sequences
• Boot
and
autoboot procedures
See
the
VAX 4000 '1}-oubleshooting
and
Diagnostics
manual
for examples
of
problems you
may
encounter
during
power-on.
1.4 Console
1/0
Mode Overview
If
you
set
the
Break
EnablelDisable switch on
the
console module to enable,
the
console
program
enters
Console
110
mode
after
the
power-on self-tests
are
completed successfully.
The
console program also
enters
Console
110
mode
in
response to
any
external
halt
condition.
CAUTION: Do not press the Restart button while the console program is
in
console mode. Doing so destroys the system state
and
prevents normal
operation.
Console I/O mode allows you to control
the
system
by
typing
commands
at
the
console
prompt
(»».
You
may
enter
these
commands
in
either
uppercase
or
lowercase
letters.
Enter
each command,
then
press
IRetum!.
1.4.1 Control Characters in Console I/O Mode
Table
1-1
lists
the
keypad
control
characters
that
have
special
meaning
in
Console I/O mode.
1-4
VAX 4000 Model 300 Technical Information