Boot
System
Priority
Control
Devices
are
searched in priority
order
for
ass.
This
priority
order
is
determined
by
the
boot
list.
The
boot
list for
the
Boot
ROM
is:
1.
External
discs
at
select codes 0-31 on bus address 0,
unit
0, volume 0
2.
An SRM
at
node 0
at
select code
21
on volume 8
3.
HP
98259 Bubble Memory
Card
on select code 30
4.
HP
98255
EPROM
Card
"disc",
unit
0
5.
ROM
operating
systems
6.
Remaining
external
discs
at
select codes 0-31,
bus
addresses 0-7,
units
0-16, volumes 0-7
7.
Remaining SRMs
at
select codes
0-:31
8.
Remaining
HP
98259 Bubble Memory
Cards
on select codes 0
through
29
and
31
9. Remaining
HP
98255
EPROM
Card
"disc"
units
Each device is allowed
to
have rnultiple
ass.
Again, if
the
machine is
unattended,
it will
boot
the
first
as
found.
If
the
machine
is
attended
(i.e. a key was struck after
the
input
human
interface was initialized), it will display all
ass
found until one
is
selected
and
that
one
is
found.
For each category in
the
boot
list,
there
is
also
an
order
of
search based on address location.
In
all cases, lower addresses are found first.
This
rneans
that
a ROM
as
at
8000016, will
be
found
before
another
ROl\1
as
at
100000
16
,
and
a device
at
select code 0 will
be
found before a device
at
select code
7.
If
a device has Inultiple addresses
to
locate it,
then
searching is done
at
a local
level first. For example,
after
looking
at
select code
7,
bus
address
1,
unit
1,
the
Boot
ROM
will
look
at
select code
7,
bus
address
1,
unit
2 before going
to
select code
8.
The
boot
list perrnits change
and
control of which
as
will
be
booted
in
the
Unattended
Mode.
Priorities used
to
establish
the
boot
list are:
• High priority addresses before
low
priority addresses
• Soft
ass
before
hard
ass
• Local
ass
before remote
ass
(Local refers
to
dedicated devices
and
remote refers
to
shared
devices, i.e.
an
SRM)
• Flexible media before
Hard
media
• Internal
ass
before
external
ass
(Internal refers
to
operating
systems on processor
boards
in
the
cornputer.)
• Small capacity devices before large capacity devices
Boot
Rom Functions
97
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