The
Boot
ROM
searches
the
ROM
space from 64K bytes
to
4 Mbytes. For each ROM
header found,
that
ROM
is checksummed unless
the
checksum disable
bit
is
set. ROMs
which fail checksum
are
indicated on
the
LEDs
and
the
message
ROM
X
at
<address>
Failed
is displayed. Any ROM which
supports
only 50
character
wide
alpha
video will
be
ignored,
and
the
message
ROM
X
at
<address>
Ignored
will
be
displayed,
and
the
appropriate
value will
be
sent
to
the
LEDs.
19.
Test RAM:
The
nlessage TESTING
MEMORY
is displayed on
the
last line
of
the
display,
and
the
rest of
memory
is
tested.
20. Set Up Memory:
The
nlessage SELF-TEST
MODE
is
printed
on
the
last line of
the
display.
If
a memory
failure occurred,
then
the
appropriate
value
is
sent
to
the
LEDs
and
following message
is
displayed:
Memory
Failed
at
<Hex-Address>
(W:<Hex-Write-Pattern>,
R:<Hex-Read-Pattern»
After a failure
the
Boot
ROM
drops back
to
the
next
64K
byte
boundary, unless
the
failure was
is
in
the
top
64K, in which case
the
Boot
ROM drops back
to
the
next 2K
boundary.
The
global
Boot
ROM
variables are set up. Available RAM is displayed as
a base
ten
number
in bytes.
The
amount
of
RAM
available should equal
the
amount
of
RAM
installed minus 164 bytes.
For example if one
HP
98257
RAM
card
was installed in a
computer's
accessory slot
and
a
98561-66511 processor
is
in a system slot,
the
amount
of RAM displayed would
be
1572906
Bytes.
21. Allocate Memory:
Temporary
memory
is
set
up
for
the
Boot scanner
and
Booter
routines.
22. Display
Final
LED
value:
If
an
error
occurred
during
self-test,
then
the
appropriate
value will
be
sent
to
the
LEDs
and
sounded off
on
the
beeper.
The
lower seven bits
of
LED value
are
sounded off (MSB
first)
with
ones represented by high frequency long notes
and
zeros represented by low
frequency
short
notes.
If
a
Boot
ROM
checksum
error
has occurred,
then
the
Boot
ROM
will
stop
execution
with
the
message
CONTINUE
AT
OWN
RISK
(RETURN
To
Continue)
on
the
bottonl
line of
the
display.
The
Boot
ROM will continue if
the
I Return I key
is
pressed.
If
an
error
has
occurred
and
continuous self-test looping
is
not
enabled,
and
the
error
was
not
a
Boot
ROM
checksum error,
then
the
Boot
ROM
will wait one
minute
for
the
monitor
to
warm
up
before continuing,
and
will display
the
message WAITING 1
MINUTE
(RETURN
To
Abort
Wai
t).
Pressing
the
I Return I key will cause
the
Boot
ROM
to
abort
the
one
minute
wait
and
continue.
90
Boot
Rom Functions
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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