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HP 9845B/C CE Service Manual

HP 9845B/C CE
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HP
9895A Disc Memory
Command
Set
A-5
HP and IBM Formats
The
9895A
can
work with discs which use
either
the
HP
single-
or
double-sided
formats
or
the single-sided
IBM
format. After a disc
is
inserted
in a unit, the first
status
request
for
that
unit
will
cause
the
controller to
determine
which format
is
present.
This information
is
available as
part
of
the
returned
status.
Many details of
operation
vary slightly for
the
two formats.
These
include
the
allowable
range
of
target
address,
the
updating
of target
addresses
and
the
effect of
the
0 bit.
These
differences
will
be
noted
in
the
appropriate
command
descriptions.
Loading
of
the
Recording
Heads
Control of
the
position of
the
heads
is
done
by
the
controller. Any
command
received
correctly
that
needs
to
read
or
write
the
disc
will
load
the
heads
for its
operation.
In
addition,
the
controller will
keep
the
heads
loaded
for approximately 2
seconds
after
the
command
completes
the
operation
in anticipation of a
subsequent
command.
In
multiple drive config-
urations,
the
time
the
heads
remain
loaded
on
inactive drives
can
increase
from 2
seconds
to
approximately
10
seconds,
as a function of
the
operation
in progress
on
some
active drive,
the interleave of
the
disc in
the
active drive
and
the
frequency of
the
command
from
the
host
system.
If
the
host
system
should
malfunction,
and
leave
the
controller in a
state
expecting
to receive
or
send
data,
the
controller
will
abort
the
operation
in
approximately
60
seconds
and
proceed
to
its idl-e-Ioop
where
the
heads
could
be
unloaded.
The
host
system
has
the
ability
to
lock
the
access
door
on
any
/ all of
the
drives to
prevent
unwarranted
access
to
the
discs; in this
case,
the
doors
will
not
be
unlocked
if
the
above
error
condition
should
occur.

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HP 9845B/C CE Specifications

General IconGeneral
BrandHP
Model9845B/C CE
CategoryStorage
LanguageEnglish

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