3.14.3
READY
This is
an
indicator which
Is
illuminated when the disk drive achieves a
Ready
condition.
The
Ready
condition is defined in Paragraph
3.17.1
.
3.14.4 SAFE
This is
an
indicator which
Is
Illuminated when It is possible to safely insert or remove the
disk cartridge.
When
the SAFE indicator
Is
extinguished, protective cartridge locks
prevent
removal
of
the disk cartridge.
CAUTION
DO
NOT
A TTEMPT
TO
FORCE REMOVAL
OF
A DISK
CARTRIDGE WHEN THE
SAFE
INDICA TOR
IS
EXTIN-
GUISHED. FAILURE
TO
OBSERVE UNSAFE CONDITION
CAN
RESULT IN
DAMAGE
TO
THE EQUIPMENT.
3.14.5
PROT
(PROTECT)
Two indicators, mounted in a common housing,
are
provided to indicate the data
protection status
of
the disk(s). This status information
can
be
from the
WRITE
PROTECT
switches (Paragraph 3.14.7), or from a hard-wired configuration.
When the upper
PROT
indicator is illuminated, the upper (removable) disk is protected
from a write operation; protection
of
the lower (fixed) disk is indicated by illumination
of
the lower
PROT
indicator.
The
indicators
are
extinguished
when
the respective switch (or hard-wired configuration)
is set to permit write operations.
3.14.6
UNIT NUMBER
SELECTOR
SWITCH
A 4-position thumbwheel switch may be included
on
the front panel
of
the disk drive
to
provide a means for selecting one of several peripheral units on a common
1/0
bus.
Any drive may
be assigned (designated) a particular unit number (unit address); subject to
the restriction that different units on the bus may not
have
the same number assigned.
Since the switches in different units
are
not interlocked, if two (or more) drives are
accidently assigned the
same
unit number
and
that number is then selected
by
the
controller, undefined operation may occur.
When
the thumbwheel switch
Is
not included, the disk drive will respond only to UNIT
SELECT
NO.1 line.
3.14.7
WRITE
PROTECT
SWITCHES
One or two rocker switches may
be
included in the 03000 Series Disk Drive. The purpose of
these switches is to selectively protect the disks from inadvertent write operations.
One
switch selects protection for the upper (removable) disk; the other selects protection for
the lower (fixed) disk.
The switches
are
located inside the drive enclosure,
near
the removable disk cartridge.
On
front load models the switches
are
mounted to the
rear
of the operator control panel.
Access
can
be
obtained
to
these switches only after the door is opened.
On
top load
models the switches
are
mounted at the left rear of the cartridge adapter
and
are
accessible only when the unit is pulled forward out of the cabinet.
3-12
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