3.5 SELECTING WRITE PROTECTION
When the
disk
drive Is equipped
with
WRITE PROTECT switches, the operator should
select
the
appropriate
switch
setting at the time. the cartridge
is
inserted. On
front
load
models, the
switches
are mounted
inside
the door, behind
the
operator
switch
panel;
the
drive must be In a Safe
condition
as Indicated by the SAFE
Indicator
to
open
the
door
and
gain access to these switches.
On
top
load models,
the
switches
are mounted at
the
left
rear
of
the
cartridge adapter and are accessible through
the
top
of
the
dust
cover
only
when
the
unit
Is pulled forward
out
of
the cabinet.
To select protection
for
a particular platter, set
the
applicable
switch
to
the ON pOSition.
To enable
writing
for
a particular platter, set
the
applicable
switch
to
the
OFF
position.
When a WRITE PROTECT
switch
is set
to
the
ON pOSition,
the
particular
disk
(upper
or
lower) is protected from write operations regardless
of
any
write
commands
which may be
received. When a
WRITE PROTECT
switch
is set
to
the OFF pOSition,
write
operations may
then
be
executed.
3.6
STARTING THE DISK DRIVE
Upon
completion
of
the relevant cartridge load procedure, the
disk
drive may be started as
follows.
(1) Depress and release
the
RUN I STOP
switchlindicator
located on the operator
control panel.
NOTE
Illumination
of
RUN/STOP indicates that there are no
inhibiting conditions and that the disk drive
is rotating the
disk[s].
(2) Observe
that
the
READY
indicator
becomes
illuminated
within
60 seconds
after
actuating
the
RUN/STOP
switchlindicator.
NOTE
1IIumination
of
READY indicates that the disk drive is
ready to accept interface commands.
3.7 STOPPING THE DISK DRIVE
To
stop
the
disk
drive
while
RUN (STOP is illuminated, perform the
following
procedure.
(1) Depress and release
the
RUN I STOP switch
lind
Icator.
(2) Observe
that
the
SAFE
indicator
becomes illuminated
within
25
seconds;
this
indicates
that
the dlsk(s) has
come
to
a
stop
and the cartridge may be removed
or
changed. .
3.8 DESIGNATING UNIT NUMBER
When
the
disk
drive is equipped
with
a
Unit
Number Selector Switch, the
setting
of
this
switch
determines which interface UNIT SELECT line
the
drive
will
respond to, i.e.,
the
switch
position
specifies the device (unit) address.
The operator should set the
switch
to the appropriate
position
as specified
by
the
system
and software operating procedures
for
the particular installation.
The
switch
is
set by moving the thumbwheel
until
the
desired
number
appears in the
window
adjacent
to
the thumbwheel.
Positions
1 ,
2,
3,
or
4 may have sign ificance.
3-8
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