NEC FDl165 Technical specifications

FDl165
Flexible
Disk
Drive
Product
Description
NEe
NEe
Information
Systems,lnc.
819-000090-1001
4-82

LIABILITY
DISCLAIMER
NEe
Information
Systems,
Inc.
products
are
warranted
in
accordance
with
the
terms
of
the
applicable
NEC
Information
Systems,
Inc.
product
specification.
Product
performance
is
affected
by
system
configuration,
software,
the
applica-
tion,
customer
data
and
operator
control
of
the
system
among
other
factors.
While
NEC
Information
Systems,
Inc.
products
are
considered
to
be
compatible
with
most
systems,
the
spe-
cific
functional
implementation
by
customers
of
the
product
may
vary.
Therefore,
it
is
the
customer's
responsibility
to
determine
the
suitability
of
a
product
for
a
specific
application
and
is
not
warranted
by
NEC
Information
Systems,
Inc.
First
Printing
-
April
1982
Copyright
1982©
NEe
In~ormation
Systems,
Inc.
5
Militia
Drive
Lexington,
MA
02173
Printed
in
U.S.A.

CONTENTS
CHAPTER
1
GENERAL
INFORMATION
FEATURES
••••••••
"
••••••••••••••••••••••••••••••
SPEC
IFICATIONS
•••••••••••••••••••••••••••••••••
GENERAL
.DESCRIPTION
••••••••••••••••••••••••••••
1.1
1.2
1.3
1.2.1
1.2.2
1.2
..
3
1.2.4
1.2,,5
1.2.6
1.2.7
1.2.8
1.2.9
1.2.10
1.2.11
1.2.12
Compact
Size
and
Design
•••••••••••••••
Loading/Ejection,
Interlocks,
and
Sensor
s
•••••••••••••••••••••••••••••••
Dc
Direct
Drive
Spindle
Motor
••••••.••
Read/Write
Heads
••••••••••••••••••••••
Mic~o~ro?essor-Controlled
Head
Pos1t1
on
1ng
•••••••••••••••••••••••••••
Microprocessor-Controlled
Head
Loading
Display
LEOs
••••••••••••••••••••••••••
Door
Lock
Solenoid
••••••••••••••••••••
Interface
••••••••
'
•••••••••••••••••••••
Diagnostics
•••••••••••••••••••.•••••••
Option
Selection
••••••••••••••••••••••
Variable
Frequency
Oscillator
(Optional)
••••••••••••••••••••••••••••
1-1
1-1
1-1
1-3
1-3
1-3
1-4
1-4
1-4
1-4
1-4
1-4
1-5
1-5
1-5
CHAPTER
2
INSTALLATION
2.1
2.2
PRELIMINARY
INSPECTION
•••••••••••••••••••••••••
UNPACKING/REPACKING
PROCEDURE
••••••••••••••••••
2-1
2-1
SYSTEM
REQUIREMENTS
.
2.3
2.2.1
2.2.2
2.3.1
2.3.2
2.3.3
Unpacking
Procedure
•••••••••••••••••••
Repacking
Procedure
•••••••••••••••••••
Operating
Environment
•••••••••••••••••
Space
and
Weight
Data
•••••••••••••••••
Power
Requirements
••••••••••••••••••••
2-1
2-1
2-3
2-3
2-3
2-4
2.4
INSTALLATION
PROCEDURE
••••••••••.•••••••••••.••
2-4
2.4.1
Preinstal1ation
Inspection............
2-4
2.4.2
Drive
Designation
••••••.•••••••.•••••
2-4
2.4.2.1
Terminator
Resistors..................
2-5
2.4.2.2
Drive
Identification
Selection
(DX)...
2-5
iii

2.4.2.3
2.4.2.4
2.4.2.5
2.4.2.6
2.4.3
2.4.4
CONTENTS (cont'd)
Option
Selection
••••••••••••••••••••••
Diagnostic
Plugs
(T2,
T3)
•••••••••••••
Test
Pins
(TP)
••••••••••••••••••••••••
Tr
impot
s
••••••••••••••••••••••••••••••
Mounting
and
Wiring
•••••••••••••••••••
Power
On
Testing
••••••••••••••••••••••
Page
2-5
2-10
2-11
2-12
2-12
2-16
CHAPTER
3
INTERFACE
INFORMATION
3.1
3.2
3.3
DATA
INTERFACE
CONNECTOR
DATA
••••••••••••••••••
SIGNAL
LEVELS
••••••••••••••••••••••••••••••••••
INPUT
SIGNAL
FUNCTIONS
•••••••••••••••••••••••••
3-1
3-1
3-3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.3.7
3.3.8
3.3.9
3.3.10
Drive
Select
1
to
4(DXl
to
DX4)
••••••
Head Load
(HDL)
•••••••••••••••••••••••
Step
(STP)
••••••••••••••••••••••••••••
Direction
Select
(DIR)
••••••••••••••••
Side
Select
(SSL)
•••••••••••••••••••••
Wr
i
te
Gate
(WGT)
••••••••••••••••••••••
Write
Data
(WDT)
••••••••••••••••••••••
Current
Changeover
(LWC)
••••••••••••••
Reset
(FLR)
•••••••••••••••••••••••••••
In
Use
••••••••••••••••••••••••••••••••
3-3
3-3
3-4
3-4
3-4
3-4
3-4
3-6
3-6
3-6
3.4
OUTPUT
SIGNAL
FUNCTIONS
••••••••••••••••••••••••
3-6
3.4.1
3.4.2'
3.4.3
3.4.4
3.4.5
3.4.6
3.4.7
3.4.8
Index
(IDX)
•••••••••••••••••••••••••••
Track
00
(TKC)
••••••••••••••••••••••••
Dual-Sided
(TSD)
••••••••••••••••••••••
Ready
(ROy)
•••••••••••••••••••••••••••
File
Unsafe
(FUS)
•••••••••••••••••••••
Read
Data
(RDT)
•••••••••••••••••••••••
Write
Protect
(PRT)
•••••••••••••••••••
Disk
Change
(DCG)
•••••••••••••••••••••
3-6
3-6
3-6
3-7
3-7
3-7
3-8
3-8
3.5
VFO
INTERFACE
SIGNAL
FUNCTIONS
•••••••••••••••••
3-9
3.5.1
3.5.2
3.5.3
3.5.4
Modified
Frequency
Modulated
Mode
(MFM)
•••••••••••••••••••••••••••••••••
VFO
Synchronization
(SYC)
•••••••••••••
Standardized
Read
Data
(SRO)
••••••••••
Wi
ndow
(WID)
••••••••••••••••••••••••••
iv
3-9
3-9
3-9
3-9

3.6
CONTENTS (cont'd)
INTERFACE
TIMING
•••••••••••••••••••••••••••••••
Page
3-10
3.6.1
3.6.2
3.6.3
3.6.4
3.6.5
3.6.6
Power
On
Sequence
•••••••••••••••••••••
Drive
Select
••••••••••••••••••••••••••
Step
and
Track
00
•••••••••••••••••••••
Access
••••••••••••••••••••••••••••••••
Wr
i
te
•••••••••••••••••••••••••••••••••
Read
After
Step
•••••••••••••••••••••••
TABLES
3-10
3-10
3-10
3-10
3-11
3-12
Table
1-1
1-2
2-1
2-2
Title
Model FDl165
Capacity
•••••••••••••••••••••••
Model FDl165
Specifications
•••••••••••••••••
Door Lock
Plug
Combinations
•••••••••••••••••
Test
Pins
and
Signals
•••••••••••••••••••••••
v
Page
1-5
1-5
2-9
2-12

Figure
ILLUSTRA
nONS
Title
1-2
2-2
2-3
1-1
2-1
2-2
2-3
Model
FDl165
Flexible
Disk
Drive
Components.
UnpaGking
Diagram
•••••••••••••••••••••••••••
Disk
Drive
Dimensions
•••••••••••••••••••••••
Terminator
Resistor
and
Selection
Plug
Location
and
Selection
Plug
Configuration
on
PCB......................................
2-
6
2-4
Cable
Connections
from
Disk
Drives
to
2-5
2-6
2-7
2-8
2-9
2-10
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
Controller
••••••••••••••••••••••••••••••••••
Vertical
Installation
•••••••••••••••••••••••
Horizontal
Installation
•••••••••••••••••••••
Perpendicular
Installation
••••••••••••••••••
Air
Flow
Requirements
for
Natural
Air
Cool
i
ng
•••••••••••••••••••••••••••••••••••••
Interface
Cables
Between
Disk
Drive
and
Controller
••••••••••••••••••••••••••••••••••
Interface
Connectors
Physical
Location
Diagram
••••••••
~
••••••••••••••••••••••••••••
Data
and
Control
Interface
Connector
••••••••
Signal
Edge
Cord
Connector
Circuit
Ass
ignments
•.•••••••••••••••••••••••••••••••
Driver
and
Receiver
Circuits
••••••••••••••••
Step
Signal
Timing
••••••••••••••••••••••••••
Write
Gate
Signal
Timing
••••••••••••••••••••
Write
Data
Signal
Timing
••••••••••••••••••••
Index
Signal
Timing
•••••••••••••••••••••••••
Read
Data
Signal
Timing
•••••••••••••••••••••
Disk
Change
Signal
Timing
•••••••••••••••••••
Read
Data
and
Window
Signal
Timing
••••••••••
Step
and
Track
00
Signal
Timing
•••••••••••••
Access
Timing
•••••••••••••••••••••••••••••••
Wr
i
te
T
imi
ng
••••••••••••••••••••••••••••••••
Read
After
Step
Timing
••••••••••••••••••••••
vi
2-7
2-13
2-13
2-13
2-14
2-15
2-16
3-1
3-2
3-3
3-4
3-5
3-5
3-6
3-8
3-8
3-9
3-10
3-11
3-11
3-12



CHAPTER 1
GENERAL INFORMATION
This
document
describes
the
Model
FDl165
8-Inch
Flexible
Disk
Drive
and
gives
specification,
installation,
and
inter-
face
information
in
sufficient
detail
for
evaluating
and
planning
systems.
1.1
GENERAL
DESCRIPTION
The
Model
FDl165
Flexible
Disk
Drive
is
a
compact
magnetic
disk
storage
device
that
uses
single-
or
dual-sided
flexible
disks.
wi
th
a
dual-sided
flexible
disk
and
double-densi
ty
format,
the
maximum
storage
capacity
is
l.~
million
bytes.
The
disk
drive
is
designed
for
a
long,
trouble-free
service
life
and
has
a
field-proven
mean-time-between-failures
(MTBF)
of
24,000
hours.
1.2
FEATURES
The
Model
FDl165
Flexible
Disk
Drive
is
operated
by
an
ex-
ternal
controller
(NEe
~PD765
is
recommended)
through
a
transistor-transistor
logic
(TTL)
interface.
Dc
power
is
supplied
and
controlled
externally.
Operator
controls
on
the
disk
drive
consist
of
a
door
handle
and
READY
and
BUSY
lamps
on
the
front
panel
(see
Figure
1-1).
1.2.1
Compact
Size
and
Design
The
most
apparent
features
of
the
Model
FDl165
Flexible
Disk
Drive
are
its
small
size
and
light
weight.
The
disk
drive
measures
8.55
inches
(217.2
mm)
high,
by
2.28
inches
(58.0
mm)
wide,
by
13.20
inches
(335.0
mm)
deep
and
weighs
7.
7
pounds
(3.5
kg)
,t
The
disk
drive
has
all
the
features
and
performance
of
conventional
units,
and
maintains
media
and
interface
compatibility
with
them.
Because
of
its
small
size,
two
disk
drives
can
be
mounted
in
the
same
space
as
one
conventional
drive.
If
only
one
disk
drive
is
mounted,
the
remaining
space
can
be
used
to
store
flexible
disks.
1-1

HEAD
LOAD
SOLENOID
Y---~=====~~--_-I
LAMP
Figure
1-1
Model FDl165
Flexible
D.isk
Drive
Components
The
simplified
design
of
the
disk
drive
improves
its
reli-
ability
and
simplifies
repair.
In
particular,
its
dc
direct
drive
spindle
motor
eliminates
problems
associated
with
conventional
ac
motor
drives.
•
Dr
i
ve
pulleys
and
bel
ts,
and
the
problems
associated
with
these
parts
are
eliminated.
•The
special
brush
type
dc
motor
draws
less
power
(only
26
w)
than
conventional
ac
motors,
so
that
low
power,
inexpensive
power
supplies
can
be
used.
•
Concerns
about
different
ac
voltages
and
frequencies
are
eliminated.
•
Less
heat
is
produced
by
the
disk
drive
than
with
conventional
units.
1-2

1.2.2
~oadin9/Ejection,
Interlocks,
and
Sensors
Insert
a
flexible
disk
into
the
disk
drive
and
close
the
door.
When
the
door
handle
latches
closed,
a
collet
presses
into
the
hole
of
the
flexible
disk,
centering
it
and
clamp-
ing
it
in
operating
position
on
a
spindle
below.
By
the
same
action
the
drive
motor
receives
dc
power,
it
moves
the
s~indle,
rotating
the
flexible
disk
at
360
revolutions
per
mlnute
(rpm).
Sensors
in
the
disk
drive
detect
the
follow-
ing:
a.
That
the
flexible
disk
is
properly
inserted
and
the
door
slot
is
closed.
b.
Whether
a
single-
or
dual-sided
flexible
disk
is
loaded.
c.
Whether
the
flexible
disk
has
a
write
protect
notch.
d.
Whether
the
magnetic
head
is
located
on
the
00
track
o:f
the
disk.
An
index
sensor
generates
a
pulse
once
for
each
rotation
of
the
flexible
disk,
providing
a
time
reference.
Before
you
can
unload
the
flexible
disk,
the
BUSY
lamp
on
the
front
panel
must
be
off.
The
door
slot
does
not
open
if
the
flexible
disk
is
being
used
by
the
host
controller.
1.2.3
Dc
Direct
Drive
Spindle
Motor
The
disk
spindle
is
driven
by
a
dc
motor.
This
direct
drive
dc
motor
makes
dr
i
ve
bel
ts
and
pulleys
unnecessary,
and
minimizes
the
power
required.
The
motor
provides
a
media
up-to-speed
time
of
only
600
ms.
The
flexible
disk
is
accurately
centered
and
clamped
onto
the
spindle
by
a
collet.
Clamp
pressure
is
relieved
by
springs
in
both
the
spindle
and
collet
to
protect
the
flex-
ible
disk
even
if
it
is
warped.
1.2.4
Read/Write
Heads
Data
is
written
onto
the
flexible
disk
and
read
from
it
using
ceramic
magnetic
read/write
heads.
The
read/write
heads
are
located
on
each
side
of
the
flexible
disk
and
are
mounted
on a
precision
guide-bar
carriage,
enabling
the
heads
to
be
shifted
from
track
to
track.
During
loading
and
unloading
of
a
flexible
disk,
the
heads
are
held
away
from
the
flexible
disk
surface.
1-3

1.2.5
Microprocessor-Controlled
Head
positioning
The
head
positioning
(access)
mechanism
consists
of
a
step
motor,
linked
to
the
carriage
by a
tensioned
steel
belt.
This
arrangement
provides
fast
and
accurate
access.
The
step
motor
is
controlled
by a
microprocessor,
increasing
head
posi
tioning
reliabili
ty.
Each
pulse
command
rotates
the
step
motor
shaft
1.8
degrees,
which
moves a
head/car-
riage
1/2
track
on
the
flexible
disk.
1.2.6
Microprocessor-Controlled
Head
Loading
When
the
disk
drive
logic
circuit
receives
a
head
load
in-
structiori,
it
lowers
the
heads
onto
the
flexible
disk
sur-
faces.
Head
loading
force
is
controlled
by a
solenoid.
A
microprocessor-controlled
special
cam
governs
head
loading,
reducing
damage
to
the
flexible
disk
surface,
thereby
in-
creasing
flexible
disk
operating
life
and
data
integrity.
1.2.7
Display
LEOs
Two
LEOs
on
the
front
panel
provide
a
visual
display
of
the
ready
and
busy
states
of
the
disk
drive.
1.2.8
Door Lock
Solenoid
The
door
lock
solenoid
makes
it
impossible
to
remove a
disk
during
certain
drive
operations,
thereby
preventing
data
loss
or
physical
damage
to
the
flexible
disk.
1.2.9
Interface
Signal
and
data
lines
interface
with
the
host
controller
is
by a
50-pin
edge
card
connector.
The 21
active
lines
(plus
grounds)
are
all
operated
at
TTL
levels.
The
Variable
Fre-
quency
Oscillator
(VFO)
option
requires
another
three
lines.
1.2.10
Diagnostics
The
disk
drive
diagnostics
consist
of
movable
printed
cir-
cui
t
board
(PCB)
plugs
that
can
be
used
to
establish
test
conditions.
1-4

1.2.11
Option
Selection
The
FDl165
is
equipped
with
signal
function
selection
plugs,
as
well
as
drive
door
and
busy
lamp
function
plugs.
These
function
plugs
allow
you
to
tailor
the
disk
drive
to
suit
your
particular
needs.
See
Section
2.4.2.3
for
a
full
de-
scription
of
these
features.
1.2.12
Variable
Frequency
Oscillator
(Optional)
The
optional
VFO
makes
the
interface
signals
to
the
con-
troller
more
stable.
This
feature
increases
the
overall
reliability
of
the
disk
drive.
1.3
SPECIFICATIONS
Capacities
for
the
Model
FDl165
Flexible
Disk
Drive
are
listed
in
Table
1-1.
Mechanical,
electrical,
environmental,
and
performance
specifications
are
listed
in
Table
1-2.
Table
1-1
Model
FD1l65
Capacity
(Formatted)
CAPACITY
SINGLE-SIDED
DUAL-SIDED
DUAL-SIDED
(Bytes)
SINGLE-DENSITY
SINGLE-DENSITY
DOUBLE-DENSITY
Per
diskette
24(;K
284K
303K 493K 568K 606K 985K 1137K 1212K
Per
track
3328 3840 4096 3328 3840 4096 6656 7680 8192
Per
sector
128 256 512 128 256 512 256 512
1024
Sectors
per
track
26
15 8
26
15 8
26
15 8
Table
1-2
Model
FD1l65
Specifications
FEATURES
SPECIFICATIONS
Single-Sided
Dual-Sided Dual-Sided
Single-Density
Single-Density
Double-Density
Capacity
(unformatted)
400K
bytes
800K
bytes
1,600K
bytes
Capacity
(formatted-maximum)
Per
Disk
303K
bytes
606K
bytes
1,212K
bytes
Per
Track
4,096
bytes
4,096
bytes
8,192
bytes
Per
Sector
512
bytes
512
bytes
1,024
bytes
Tracks
per
Disk
77
154
154
Bit
Density
3,268
bpi
3,408
bpi
6,816
bpi
Transfer
Rate
250K
bps
250K
bps
500K
bps
Recording
Method FM FM FMM
1-5

Table
1-2
Model
FDl165
Specifications
(cont'd)
FEATURES
SPECIFICATIONS
Number
of
Sectors/Track
Track
Density
Rotational
Speed
Access
Time
Track-to-Track
Seek
settling
time
Head
load
time
Latency
time
(average)
Start
time
Power
requirement
Power
consumption
Mechanical
Height
Width
Depth
Weight
Environmental
Ambient
temperature
Operating:
Non-operating:
Relative
humidity
Operating:
Reliability
Mean Time
Between
Failures
~ean
Time
To
Repair
Component
Life
Soft
Error
Rates
Hard
Error
Rates
Seek
Error
Rates
Media
IBM
Diskette
1
or
equivalent
IBM
Diskette
2
or
equivalent
IBM
Diskette
2D
or
equivalent
8
48
tpi
360 rpm
3.0
ms
15.0
ms
30.0
ms
83.3
ms
0.6
second
+24 Vdc
+10%
@
0.9
Amp
(maximum)
+ 5 Vdc
+5%
@
0.8
Amp
(maximum)
without
VFO/
-
0.9
Amp
(maximum)
with
VFO
26
watts
(27
watts
with
VFO)
2.28
inches
(58
mm)
8.55
inches
(217.2
mm)
13.19
inches
(335
mm)
7.7
pounds
(3.5
Kg)
50°F
to
+113°F (+10 oC
to
+45°C)
+23°F
to
+158°F
(-5°C
to
+70o
C)
20%
to
80%
24,000
Power
On
Hours
(POH)
0.5
hours
15,000
POH
or
5
years
1
bit
in
109
1
bit
in
1012
1
in
106
1-6

CHAPTER 2
INSTALLATION
This
chapter
tells
you
how
to
inspect,
unpack,
and
install
the
Model
FD1l65
Flexible
Disk
Drive.
2.1
PRELIMINARY INSPECTION
Before
unpacking
the
Model
FDl165
Flexible
Disk
Drive,
in-
spect
the
shipping
carton
for
any
damage.
If
there
is
dam-
age,
notify
the
carrier
immediately.
Do
not
open
the
carton
until
the
carrier's
representative
inspects
it.
If
the
carton
is
undamaged,
follow
the
unpacking
procedure.
2.2
UNPACKING/REPACKING
PROCEDURE
This
section
describes
how
to
unpack
and
repack
the
disk
drive.
2.2.1
Unpacking
Procedure
To
unpack
the
disk
drive,
refer
to
Figure
2-1
and
follow
these
steps.
Save
all
shipping
materials
for
possible
future
use.
a.
Remove
the
tape
band
from
around
the
shipping
package.
b.
Slide
the
styrofoam
case
out
of
the
cardboard
sur-
round.
c.
Open
the
styrofoam
case.
d.
Remove
the
plastic
film
cover
from
the
disk
drive.
e.
Inspect
the
disk
drive
for
any
shipment
damage.
2.2.2
Repacking
Procedure
To
repackage
a
disk
drive
for
reshipment,
reverse
the
pro-
cedure
in
Section
2.2.1.
2-1

PLASTIC
FILM
COVER
Figure
2-1
Unpacking
Diagram
2-2

2.3
SYSTEM
REQU:IREMENTS
This
section
describes
the
environmental,
space
and
weight,
and
power
requirements.
2.3.1
Operating
Environment
Install
the
dislt
drive
in
any
clean,
relatively
dust-free
environment
with
an
ambient
temperature
of
50°F
to
ll3°F
(lOoe
to
45°C)
and
relative
humidity
of
20%
to
80%.
The
maximum
ambient
stray
magnetic
field
is
specified
as
4000
Aim.
Typical
heat
dissipation
by
the
disk
dri
ve
is
22.3
Kcal/h
(23.3
Kcallh
with
VFO).
2.3.2
Space
and
Weight
Data
The
disk
drive
is
designed
for
vertical,
horizontal,
or
perpendicular
shelf
mounting.
Provide
space
for
cabling
and
servicing.
Refer
to
Figure
2-2
for
overall
dimensions.
The
unit
weighs
7.7
pounds
(3.5
Kg).
Figure
2-2
Disk
Drive
Dimensions
2-3

2.3.3
Power
Requirements
Because
the
disk
dr
i
ve
does
not
include
a
power
supply,
a
dc
source
must
be
supplied
as
follows.
~
SPECIFICATION
+24 V
POWER
SUPPLY
+5
V
POWER
SUPPLY
Voltage
+24 +
10%
+5 V +
5%
Normal
Current
0.75
A
0.8
A
0.9
A
(Wi
thout
VFO)
(With
VFO)
Starting
Current
0.9
A
0.8
A
0.9
A
(Without
VFO)
(With
VFO)
Ripple
voltage
Not
greater
than
Not
greater
than
400
mVpp
70
mVpp
Transient
response
200
ms
time
2.4
INSTALLATION
PROCEDURE
Perform
the
following
procedures
to
install
the
disk
drive.
2.4.1
Preinstallation
Inspection
a.
Inspect
for
damage,
loose
parts,
or
other
obvious
indications
of
problems.
Check
that
all
connectors
are
tightly
mated.
b.
Remove
the
dummy
flexible
disk
from
the
unit.
c.
Insert
a
flexible
disk
through
the
door,
press
the
door
handle
to
latch
posi
tion,
and
check
that
the
collet
assembly
engages
the
flexible
disk
wi
thout
binding.
Turn
the
spindle
and
check
that
the
flex-
ible
disk
rotates
freely.
d.
Press
the
door
handle
and
check
that
the
flexible
disk
is
ejected.
2.4.2
Drive
Designation
If
more
than
one
disk
dr
i
ve
is
connected
to
the
same
con-
troller
and
the
signal
interface
connectors
are
wired
in
series
from
acommon
controller
port
(daisy
chain),
remove
the
terminating
resistors
from
all
disk
dr
ive
PCBs
except
the
last
uni
t
in
the
ser
i
es.
Instr
uctions
for
this
pro-
cedure
are
provided
in
section
2.4.2.1.
If
more
than
one
disk
drive
is
connected
to
a
single
controller,
identify
each
disk
drive
by
an
addressable
number
(DXl,
DX2, DX3,
or
DX4).
Instructions
for
this
procedure
are
provided
in
Sec-
tion
2.4.2.2.
2-4

2.4.2.1
Terminator
Resistors
All
disk
drives
are
shipped
with
terminator
resistor
arrays
(RNI
and
RN2)
installed
as
shown
in
Figure
2-3.
Do
not
re-
move
these
resistors
when
only
a
single
disk
drive
is
used
in
a
system.
Do
not
remove
these
resistors
when two
or
more
disk
drives
are
served
by a
single
controller
but
are
connected
in
par-
allel
as
shown by
(A)
in
Figure
2-4.
However,
if
two
or
more
disk
drives
are
connected
to
the
controller
on a
common
line
in
series
(daisy
chain)
as
shown
in
(B)
of
Figure
2-4,
remove
RNI
and
RN2
from
each
disk
drive
except
the
last
one
in
the
circuit.
2.4.2.2
Drive
Identification
Selection
(OX)
When
only
one
dfLsk
drive
is
used
in
a
system,
insert
the
DRIVE
SELECTION
shorting
plug
(see
Figure
2-3)
to
identify
that
dr
ive
as
DXI.
When
two
or
more
disk
dr
ives
are
used
in
a
system
(four
maximum),
assign
each
one
a
different
OX
number and
insert
the
shorting
plug
for
that
unit
appropri-
ately
(see
Figure
2-3).
The
unit
is
supplied
with
DXI
selected.
2.4.2.3
Option
Selection
The
following
section
describes
option
selection
on
the
FDl165 PCB.
See
Figure
2-3
for
the
location
of
the
selec-
tion
plugs
and
pins
and a
configuration
chart.
See
Chapter
3
for
an
explanation
of
the
signals.
HEAD
LOAD
PLUG
(HL)
When
you
select
plug
position
1,
head
load
action
is
initi-
a
ted
by aHead r
..
oad
signal
from
the
con
troller.
When
you
select
plug
position
2,
head
load
action
is
initiated
by a
Drive
Select
signal
from
the
controller.
The
unit
is
sup-
plied
with
HL
1
selected.
RADIAL
READY
PLUG
(RX)
When
you
select
plug
position
1,
the
Ready
signal
sent
from
the
disk
drive
i.s
gated
by
the
Drive
Select
signal.
When
you
select
plug
position
2,
the
Ready
signal
is
independent
of
the
drive
select
signal.
The
unit
is
supplied
with
RX
1
selected.
2-5

TP I I I I I
G89G
rerGl
us
~
211i:i11
RV1
RV
2
I
RN
1l1
RX
22
FR1
E:::]1!!3
DRI
E!!I211:!:!!)
2
Dl
PRI
~21r:::::::J2
DH
TPI
I I I I I I I
7131019121118
1~~X3
22
1
:
••
; 4
(-R-N-2-'
.
1I::::!J
2
HL
SS
T3
e:m::J
T2
T1
l!I!I
2
as
11
BU
2
,,,
•.
i
•.••
RD
2'·
....
'1
[ID
RV3
DX1
DX2 DX3 DX4
1313131 3
~
••••
CJ
••
OX
PLUG
•
~
•••
CJ
••••••
24242424
POS1
POS2
RX,Hl,DR,
PR,
Dl,
DH,
1E:).
21 •
E:)2
BU,
PLUGS
POS1
POS2
US,RD,
PINS
(SOLDER TYPE)
2.
----1
2----·1
POS1
POS2
BS,FR,
2.
E31
2E3
·1
PLUGS
T2,T3 T2 T3
PLUGS
T3·BT2
T3Ej,.
T2
Figure
2-3
Terminator
Resistor
and
Selection
Plug
Location
and
Selection
Plug
Configuration
on
PCB
2-6
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