Specifications
Ifthe
self-tests
are
successful,
the
system does one
of
two things, depending
on
whether
the
Break
EnablelDisable switch on
the
CPU cover
panel
is
set
to
disable
or
enable.
If the Break Enable/Disable Switch Is Disabled
If
the
Break
EnablelDisable switch is
set
to disable,
the
CPU
tries
to
autoboot
an
operating system.
It
locates a 128-Kbyte segment
of
system
memory
and
copies a
primary
bootstrap program, called VMB, from
the
ROM chip into
the
base
address
plus 512. The CPU
then
begins executing
VMB, which
attempts
to bootstrap
an
operating system.
The
system does
not
test
all devices
in
search of bootable software,
but
looks for a previously-selected boot device.
If
you have
not
yet
selected a boot device,
the
system issues a
list
of boot able
devices
and
prompts you to select a boot device from
the
list. Depending
on
whether
you type
in
a device name, one of two
things
happens:
•
If
you
do
not
type a boot device
name
within
thirty
seconds,
the
system
boots from
the
Ethernet
adapter,
ESAO.
•
If
you type a boot device
name
within
thirty
seconds,
the
system
boots
from
that
device.
For
more information about
this
process, see Operation.
NOTE:
Selecting a boot device other than the Ethernet adapter is not
appropriate for diskless
and
tapeless systems which
must
boot software over
the network.
Once you have selected a default boot device, you
may
change
the
default
boot device by
using
the
SET
BOOT device name command.
To
use
the
command,
put
the
system into console mode by pressing
the
Halt
button
twice.
At
the
>>>
prompt,
enter
"SET BOOT device-name." Use Table
1-1
to
determine
the
name
of
the
boot device you
want
to select.
Table
1-1:
Device Names
Controller
Type
Controller
Device
Name
DSSI
On-board CPU DImn (fixed disks)
MSCP (Tape)
TQK70 MUmn
PROM
MRVll
PRAn
Ethernet
adapter
On-board CPU
ESAO
1-4 MicroVAX 3400 VAXserver 3400 Technical Information