TANDON
OEM
OPERATING
AND
SERVICE
MANUAL
MODEL
NUMBERS
5.25"
SEPTEMBER
TM602S, TM603S,AND TM603SE
RIGID
DISK DRIVES
20,
PRELIM'
1982
RY
TANDON
20320
CHATSWORTH,
TEL.
TWX
TELEX
CORPORATION
PRAIRIE
NO.:
NO.:
NO.:
STREET
CA
91311
(
213)
910-494-1721
194794
993-6644
TANDON
AM
SUEDPARK
D-6092
TEL.
TELEX
pIN
NO.:
187275-004
INTERNATIONAL
7A
KELSTERBACB,
06
11/49
NO.:
411547
Rev..C
GMBH
WEST
6107
GERMANY
2091
CONTENTS
Page
Number
SECTION
1.1
1.2
1.3
1.4
1.5
SECTION
2.1
2.2
2.3
2.4
2.5
SECTION
3.1
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2..6
3.3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.4
3.4.1
3.4.2
I--GENERAL
Scope
Introduction
Disk
Disk
Pqysical
Drive
Drive
Dimensions
II--INSPECTION,
Introduction
Unpacking
Mounting
Power
Standard
and
Characteristics
Cabling
Interface
III--THEORY
Introduction
Input
Reduced
Write
Head
Step
Di
Drive
Output
Drive
Seek
Track
Fault
Line
Control
Gate
Select
Interface
rection
Select
Control
Selected
Complete
00eJ
Ready
Write
In
••••••••••••••••••••••••••••••
Index
Data
MFM
MFM
Transfer
Write
Read
Data
Data
INFORMATION
....•.•...............•.•.•
Performance
Model
Specifications
Characteristics.
••..•...•.••.•.•..••
INSTALLATION,
••••••••••.••..•.••.•.•..••
Inspection
•••••••••••.•.•
•••••••••••••.•
•••••••••••.••.•••••••••••
••••••••••.•.••••••••
OF
OPERATION
.•..•.•••.••.•••••.••••.•••
Lines
Current
••.•••••..••••••••••
.•••.•••..••••.••.
••••••.•••••••.•••••••••.••••
••••••••••.•••.•••••••••••••
•••••••••••••••••••••••••
•••••••••••••••••.•••••••••
••••••••••••.•••.••••••••••
Lines
••••.•••••••••••••••
•••••••••••••••••••••••••
••••••••••••••••••••••••••
0
••••••••••••
•••••••••••••••••••••••••.•••
Lines
••••••••••••••.•••••
•••••••••.••••••.••••.•••
••••••••••••••••••••••••••
AND
.•••.•••
INTERFACES
,.
••••
1-1
1-1
1-1
1-1
1-4
2-1
2-1
2-3
2-3
2-3
3-1
3-2
3-2
3-2
3-3
3-3
3-4
3-4
3-5
3-5
3-5
3-5
3-6
3-6
3-6
3-6
3-6
3-7
LIST
OF
ILLUSTRATIONS
FIGURES
Figure
Number
1
2
3
4
5
6
7
8
9
Table
Number
1
2
3
4
Title
Typical
Voltage
Disk
Drive
Locations
J 3
Connector
Jl
Connector
J2
Connector
Control
Circuit
Step
Data
Mode
Line
Title
Disk
Disk
Drive
Drive
Standard
Head
Select
starting
Physical
of
Interface
........•.............•...••
Dimensions
Dimensions
Signal
Driver/Receiver
Combination
Timing
Driver/Receiver
Performance
Model
Interface
.•............•.••..•
Current
at
Dimensions
Connectors
••............•.•
.•........••...•.•..•
Diagram
•..•••...•.••..•
TABLES
Characteristics
Specifications
...••........••...•..•
Nominal
Circuit
....•••
....•...•
"
.....
••
".
Page
Number
1-3
1-5
2-2
2-
3
2-4
2-4
3-1
3-4
3-7
Page
Number
1-2
1-4
2-7
3-3
Appendix
Number
A
B
Title
C~stomer
Schematics
APPENDIX
Information
""."
•.."..
Bulletins
"......................
ii
•.......••
Page
Number
A-I
B-1
SECTION
I--GENERAL
INFORMATION
1.1
This
and
rigid
requirements
Model
1.2
The
low-dost,
noncontact
three-platter
technology
This
within
configuration,
mechanism,
positioning
Interface
standard
compatible
defined
the
manual
operation
disk
Numbers
TM600
drive
as
function
SCOPE
contains
of
drives.
and
TM602S,
INTRODUCTION
family
random
recording
models,
and
the
flexibility
interface
using
130
consists
drive
read/write
a
read/write
device,
with
are
larger
the
common.
information
Tandon
descriptions
access
millimeter
of
and
same
Corporation's
This
TM603S,
of
techniques.
which
storage
in
an
is
on
capacity
pin
manual
5.25"
memories
rigid
a
fixed
and
control
head,
air
provided
the
filtration
drive.
assignment
useful
of
and
use
media
a
disk
TM600
also
signals.
TM603SE,
rigid
that
There
standard
media.
(nonoperator
electronics,
precision
by
The
drives.
where
in
the
contains
disk
use
are
that
system.
using
"s"
installation
family
TM600
as
moving
both
Compatible
the
refers
appropriate.
drives
Winchester
is
contained
removable)
the
split
an
version
signal
of
5.25"
interface
head,
two-
drive
band
industry
to
are
and
is
is
and
1.3
The
of
1.4
Table
and
information
the
Tandon
2
the
DISK
DISK
contains
number
DRIVE
TM600
DRIVE
PERFORMANCE
contained
family
MODEL
a
of
platters
CHARACTERISTICS
in
Table
of
disk
SPECIFICATIONS
list
each
1-1
of
drives.
the
one
1
pertains
drive
has.
models
to
all
Imodels
available
Table
1
Model
Disks/Platters
Heads/Recording
Surfaces
TPI
II
Cit
•
II••II
••••
Cylinders
RPfv1
•••••.••
Recording
Capacity,
Unformatted:
Per
Drive
Per
Surface
Per
Track
Trans
fer
Rate
Recording
Density
(BPI)
Tracks
7\ccess
Time
Track-to-Track
Average
Head
Average
Settling
Latency
Disk
Drive
TM602S TM603S
2
4
Cit
153
Cit
•••••••
II
....
II
6.38
1.59
..•..•..•..•...••..
...•••.••..•.•••.•.••••...
7690
612
••••••••••
153
ramped
Time
••.....•..•.......
..........•.•...•••
Cit
•••
e.
MBytes
MBytes
0
ms,
seek
•••••
Performance
II
It
•••
0 • 0
....,•
Cit
10
.40
milliseconds
3
99
ms
8.34
Characteristics
3
6
41)
••
254
153
,,3600
9.57
1.59
RPM + 1
MBytes
MBytes
KBytes
5 Mbi
7690
918
153
ms,
ramped
15
milliseconds
milliseconds
TPI
II
•••
0..II.,••
percent
...•.....••....•.......••.
ts
per
\
I
second
.....•.••.•..•..••.•.••
99
ms
seek
..........••..•.•
......••.........
TM603SE
3
6
0 •,.•••••
230
...
0
14.35
2.39
.•..•..•.•.••
9625
1380
210
ms,
ramped
••••
MBytes
MBytes
137
seek
II
••
Cit
••••
rns
Mechanical
Height
wid
Length.
Error
Soft
Hard
Seek
th
Rates
..
0
Read
Read
Errors
Power
+l:2V
+5V
D.
D.
C.
Environmental
Ambient
Temperature:
Relative
Maximum
*Periodic
Dimensions
0
•••
0 0
.,
e
....
••••
Cit
fit
•••
Cit.." 0
••••
...•••••.•.••..•.•.•••...
•.....•..••••••..•••.•••.
.••.....•...•...•...•.•
C.
+/-
10%
with
+/-
5%..8
PARD*
Humidity:
Wet
and
Bulb
Random
Temperature:
., •
Cit
••
0 0.,• •
,.
0 " 8' •
crt
••••
,.•.,
••••
(III
co
1.5
amps
no
more
amps
typical
Operating:
Nonoperating:
8%
to
80%
Deviation.
..
(I
Cit
tyical,
than
3.
" 5
.8
16°C
-35.4
25
inch
I)
75
inch
11)
00
inch.,
lXl0
lX10~2
1X10
5
5
millivolts
with
l0
amps
to
0
C
I)
•••
CD
••••
..
bits
bits
seeks
no
46°C
to
.,
0I)It
......
It
4)
••
0
Cit
• (II
0 0
••••••••
...•..••..••..••••••.••
...•••.•..••.•.•.•.•••.
maximum
for
PARD*
more
(50
60°C
than
0
p
to
(~400p
II
......
••
CD
" •
(see
50
l150p)
0II..6)0
<>
0CD•.,• 0 0 0 •
••
0 0
••
Cit
10
seconds
Figure
millivolts
140
0
P)
to
••
0
Cit
••
It
..
I).
Specifications
SUbject
To
Change
Without
1-2
Notice.
>
N
+
>
I()
+
N
...
...
....
0
...
0)
[)
W
co
~
z
9
,.....
z
a::
::>
....
a::
co
w
....
u..
«
It)
w
~
i=
'I:f
Typical
Starting
Figure
Currents
1-3
1
At
Nominal
o
o
Voltage
Table
2
Model
Number
TM602-S
Tt1603-SE
TM603-S
1.5
The
are
in
major
contained
English
Disk
Drive
Number
Model
of
Platters
2
3
3
PHYSICAL DIMENSIONS
physical
and
in
dimensions
in
Figure
metric
units.
Specifications
Kind
Interface
Standard
Standard/Extended
Standard
of
the
TM600
2.
These
of
family
dimensions
Version
of
are
drives
given
1-4
0.06
(1.6 ±
± 0.01 in.
0.3
mm)
...--.--------
I
8.00
in.
(203.2
maximum
mm)
--------
.......
1 I
3.38
± 0.01 in.
85.9±0.3
L
0.19
± 0.01 in.
(4.8 ±
0.3
mm)
mm)
J
L87±OO2in
(47.5 ± 0.5
mml
3.12±0.02
(79.2 ±
0.5
SIDE VIEW
in.
mm)
I
TAPPED
ON
BonOM.
6·32
UNCX31
PLACES.
3.25
(82.6 ±
MOUNTING
HOLES
TWOONEACH SIDE
in
..
17.9
± 0.01 in.
0.3
FOUR
mml
DEEP
mm)
8
5.88
± 0.01 in.
(149.4±0.3
mm)
0.06
(1.6 ±
± 0.01 in.
0.3
mm)
Disk
BOTTOM VIEW
Drive
Figure
Physical
1-5
2
Dimensions
5.50±.02
139.7±0.5
5.75±.02
(146.1 ±
in.
mm)
0.3
in.
mm)
SECTION
II--INSPECTION,
INSTALLATION,
AND
INTERFACES
2.1
This
section
tion,
of
rigid
The
electrical
system
for
the
read/write
provides
of
the
2.2
The
when
bulk
during
method
INTRODUCTION,
installation,
disk
is
via
drive.
data
for
interface
UNPACKING
drive
packaged,
shipment.
of
uncrating
1.
Place
2.
Remove
contains
drives.
four
frame
is
the
and
interface
connectors.
J2
provides
signals.
ground.
connectors.
AND
shipped
minimizes
The
following
the
shipping
the
upper
information
interfaces
between
for
J3
provides
Figure
INSPECTION
in
a
drive.
container
half
pertinent
of
the
the
Jl
provides
the
3
protective
the
possibility
procedure
of
Tandon
drive
radial
for
contains
is
on
a
the
to
control
connection
D. C.
the
container
the
flat
inner
the
inspec-
TM600
and
family
the
signals
power.
locations
which,
of
damage
recommended
work
surface.
container.
host
of
J4
3.
Remove
inner
4.
Check
against
5.
Visually
container
6.
Notify
is
found.
7.
The
compartment
REMOVAL
INVALIDATES
the
container.
the
model
the
packing
examine
for
the
inside
that
OF
THE
WARRANTY.
drive
number
possible
carrier
chamber
must
THE
from
slip.
the
NOTE
the
and
contents
damage.
immediately
of
not
be
COVER
top
the
opened.
lower
assembly
of
drive
OF
half
description
the
if
any
is
THE
of
shipping
damage
a
sealed
DRIVE
the
2-1
FRONT
PANEL~
COMPONENT
OF CIRCUIT BOARD
SIDE
OR
HOL~SS~4
HARNESS
PLACES)
V-AXIS
CABLE
Figure
X-AXIS
3
Locations
of
Interface
2-2
Connectors
Before
inspection
1.
2.
3.
applying
procedure
Check
Check
seated.
Notify
damage.
to
to
the
power
should
ensure
ensure
to
that
carrier
the
be
performed:
the
that
immediately
disk
circuit
the
drive,
boards
connectors
if
the
are
you
following
secure.
are
firmly
find
any
2.3
The
mounting
drives
tapped
two
on
2.4
The
D.C.
device,
of
the
is
AMP
are
labeled
illustration
MOUNTING
are
mounting
each
POWER
power
pIN
circuit
piN
1-480424-0,
characteristics
contained
holes
side
of
CABLING
connector,
350211-1,
board.
on
the
of
the
CHARACTERISTICS
of
in
Figure
on
the
bottom
it.
J3,
J3
J3
connector.
which
The
using
connector.
Figure
is
recommended
AMP
4
the
2.
is
a
mounted
pins
TM600
There
of
the
four-pin
mating
pIN
Figure
family
are
disk
AMP
on
the
connector,
60617-4.
4
of
four
drive,
Mate-N-Lok
solder
J3
contains
disk
6-32,
and
side
P3,
pins
an
The
frame
The
recommended
2.5
The
2-1.
standard
Connection
connector.
Figure
numbered
circuit
connentor
is
labeled.
ground
STANDARD
~The
5.
The
pins
board.
closest
connector,
mating
INTERFACE
or
usu
to
dimensions
pins
are
Pin
2
to
A
key
J3
connector
model
Jl
are
located
located
the
slot
Connector
J4
is
interface
is
via
of
numbered
on
on
D.
C.
is
2-3
the
is
AMP
a
34-pin
the
Jl
the
the
power
located
Faston
pIN
is
connector
1
through
compoenent
end
of
connector
between
AMP
62187-1.
contained
circuit
34.
the
circuit
J3/p3,
Pins
pIN
are
side
61761-2.
in
board
found
The
4
Table
of
board
and
and
edge
in
even
the
it
6.
0.036±0.004
(0.91 ±
0.'
mml
0.063
In.
(1.6
in.
mm)
t
0.400
± 0.01
(10.2±0.25
,
)
oin.
mm)
lr
2 4
.....
~
--11-
~-------_
-
-
----i'"'
Jl
0.450
0050
(1.27
mm)
Connector
r
in.
(11.4
in.
1.775±0.010
(45.1 ±
Figure
mm)
-
0.25
in.
mm)
5
Dimensions
-
--..!.l
~
l[
.....
I
I,
J
WO.050
,...
.....
,
I
J4 I
-...
..
1
r---J
0.100
in.
(1.27
in.
(2.54
BOARD
(1.59
THICKNESS
0.062±0.007
mm±0.18
mm)
mm)
in.
mm)
0.036
(0.91 ± 0.1
---~5
1
0.400±0.010
10.2±0.25
_t
0.050
(1.27
± O.•
004
in'1r--
mm)
2
in.
mm)
in. I I I
mm)
--;-'iLr-
.
J2
,...-
0.063
I
--.......-
, _ (1.6
-lll~~
---l
I.
,_
I
mm)
0.050
0.100
in.
in.
in.
BOARD
0.062±0.007
(1.59
(1.27
mm)
(2.54
mm)
mm±0.18
1.075±0.010in.~
(27.3±0.25
Connector
Figure
2-4
mm)
6
Dimensions
THICKNESS
in.
mm)
The
recommended
connector,
pIN
mating
3463-0001,
connector
without
ears.
for
PI
is
a
3M
ribbon
connection
nector.
Figure
numbered
circuit
3M
ribbon
is
located
to
The
6.
dimensions
The
pins
board.
connector,
between
J2
are
The
is
via
pins
are
located
recommended
pIN
3461-0001,
Pins
4
of
and
a
20-pin
the
numbered
on
the
mating
6.
circuit
J2
1
without
connector
through
component
connector
ears.
board
20.
are
side
for
A
edge
found
The
P2
key
of
con-
even
the
is
slot
in
a
2-5
Table
3
Connector
PI
A
34-Pin
Ribbon
Daisy
Chain
Interface
Pin
Number
Signal
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
Standard
(Gnd)
(
1)
(
3)
( 5 )
7)
(
(9
)
(11)
(13)
(15)
(17)
(19
)
(21)
(
23)
(25)
(27)
(29)
(31
)
(33)
Interface
Signal
Type
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
I/O
I
I
o
o
o
I
I
o
o
I
I
I
I
I
I
Signal
Reduce
Head
Select
Write
Seek
Complete
Track
Fault
Head
Select
Reserved
Head
Select
Index
Ready
Step
Drive
Drive
Drive
Drive
Direction
Name
Write
Gate
000
(To
Select
Select
Select
Select
In
~
2
0
2
i2-7)
2
0
1
2
3
P;
I
20-Pin
Ribbon
Daisy
Chain
or
R?dial
~
P2
P~
4-pin
Radial
p~
Notes:
Power
1.
2.
S D -
1
3
5
7
9
11
(
(4
(6)
(8)
(10
(12)
13
14
15
(16)
17
18
19
1
4
(20
2
3
Single
Differential
2)
)
)
)
ended
S
S
S
o
I
Drive
Reserved
Reset
Reserved
Selected
(+5
(TO
V)
Jl-16)
Spare
Ground
+
-
Write
Write
D
D
I
I
Data
Data
Ground
+
-
Read
Read
D
D
o
o
Data
Data
Ground
+12
3.
4.
I -
0 -
V D.
12
V
5 V
Return
+5 V D. C.
Drive
Drive
input
output
Return
C.
In
In
2-6
SECTION
III--THEORY
OF
OPERATION
3.1
There
Signals
They
See
Figure
are
have
INTRODUCTION
three
1.
2.
3.
on
the
True:
kinds
Input
Output
Data
the
Input
following
0.0
maximum
False:
2.5
open
7
for
the
of
interface
Control
Control
Transfer
Control
electrical
volt
volt
D.
D.
recommended
Lines
Lines
Lines
C.
C.
signals:
lines
specifications:
to
0.4
to
5.25
circuit.
are
standard
volt
volt
+
5V
D.
D.
C.
C.
TTL
levels.
@ I =
@ I = 0
40
rnA
rnA
7438
EaUiVAlENT
OR
Control
Signal
20
FT.
MAXIMUM-'
Figure
Driver/Receiver
220Q
74LS14
EaUIVALENT
OR
7
Circuit
Combination
3-1
3.2
INPUT
CONTROL
LINES
There
are
multiplexed
multiplexing.
The
Input
1.
4.
5.
The
Input
Control
2.
3.
Control
4.
two
in
Reduced
Write
Head
Step
Direction
1.
Drive
2.
Drive
3.
Drive
Drive
kinds
a
multiple
lines
Write
Gate
Select
Interface
lines
of
In
that
Select
Select
Select
Select
Input
that
Current
drive
are
do
0
1
2
3
Control
system
mUltiplexed
the
multiplexing
lines,
and
those
those
include:
that
are:
that
do
are
the
3.2.1
When
this
conjunction
current
is
is
set
selected.
recommended
greater,
A
220/230
3.2.2
The
when
Write
it
is
reached.
activated.
the
should
the
The
line
disk
go
disk.
inactive
enables
Reduced
Input
selected
high
the
ohm
Write
Gate
activated
The
is
true
write
Control
with
the
(false),
When
that
writing
this
Reduced
resistor
Gate
signal
ready
If
a
disk
propibited.
before
or
logical
the
step
for
or
Current
write
writing
the
line
Write
pack
enables
when
line
drive
you
high
pulses
line
on
be
allows
must
In
begin
is
gate,
on
higher
Tracks
set
Current
data
the
logical
be
fault
addition,
to
(false)
to
step
activated
a
the
value
false.
line
the
to
be
valid
occurs,
write
level
the
lower
disk.
0
line
zero
before
the
write
through
For
should
to
written
further
Seek
any
on
head,
low'(true)
value
When
the
current
127,
Tracks
be
set
be
terminated.
on
(true)
write
writing
Complete
information
the
Write
arm
actuator.
of
signal
128
the
level
gate
write
it
and
true.
disk
line
Gate
in
is
is
is
is
on
on
3-2
3.2..3
Head
Select
There
each
Head
be
read/write
Select
activated
heads
significant
Head
Select
numbers
Head
22
1
1 1
1
1
0
(2}
are
are
that
three
signals
in
numbered
line.
line
may
Select
Head
head--0,
conjunction
be
Line
1
2
1 1
Select
1,
are
0
through
Table
sequence,
selected.
Table
Head
Sequence
0
2
0
or
logic
with
3-1
lines.
2--in
low
5.
contains
disk
3-1
Select
the
a
(true)
Drive
Head
drive
They
are
binary
levels.
Select
Select
information
Head
model
Number
0 1 2
(2}
0
1 1
1
(2}
used
coded
0
is
Model
TM602
0
1
3
to
sequence.
They
lines.
the
about
number,
Number
Selected
select
must
The
least
the
and
TM603
0
1
2
3
4
5
Legend:
A
220/330
3.2.4
When
the
the
Direction
direction
initiated
the
trailing
Direction
the
this
The
leading
line
heads
Figure
timing.
Step
by
In
should.
move
8
contains
1
(2}
ohm
Step
defined
a
line
Logical
=
Logical
=
resistor
Interface
Interface
In
logical
edge
must
edge
of
be
at
the
the
line,
by'
of
be
the
held
rate
sequence
High
Low
pack
line
the
zero
the
made
step
logically
(False)
(True)
allows
is
the
Direction
to
a
step
one
pulse.
of
the
and
the
activated
read/write
In
logical
pulse.
hundred
high
incoming
the
line
to
in
conjunction
be
heads
line.
one
transition
Any
nanoseconds
The
quiescent
(false).
step
requirements
terminated.
move
The
motion
change
for
in
or
in
before
state
pulses.
step
with
the
is
by
the
of
3-3
--I
!~
,00NS
MINIMUM.
200
US
MAXIMUM
DIRECTION IN
- STEP
-SEEK
3.2.5
The
heads
center
(low)
motion
In
occurs.
COMPLETE
Direction
line
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I f
I
500
when
of
state
is
NS
MAXIMUM
---------',
Direction
In
a
step
the
when
away
is
in
~1
step
line
pulse
disk
a
from
the
~
loOllllllll--'·O
!.-
In
determines
if
step
the
3.0
MS
MINIMUM
US
MINIMUM
STEP LOGIC
ENERGIZED I
4-
I
...----------------1,
Figure
Mode
is
the
pulse
center
false
8
Timing
issued.
Direction
occurs.
(high)
Diagram
the
of
the
--IIj
Ur----I)
motion
The
motion
In
line
The
disk
state
4111(15
+ 3
MS~
I TYPICAL
of
the
is
is
in
direction
if
the
when
a
f
'----
read/write
toward
the
of
Direction
step
pulse
the
true
the
A
220/330
3.2,,6
Drive
and
four
The
Signal
a
controller.
When
circuits
do
line
or
Only
operation
same
true
deselecting
drives
drive
means
logically
not
must
Read/Write
one
address
(low)
ohm
resistor
Drive
Select
circuit
of
or
acknowledge
remain
line
might
state
lines
that
address
board.
daisy
logically
command
or
pack
Select
0
through
a
drive.
are
daisy
is
determined
Drive
changing
high
signals
stable
can
result
if
simultaneously.
two
(false),
high
is
be
if
or
in
executed.
allows
chained
Select
(false),
presented
the
true
two
more
3-4
the
line
3
provide
These
a maximum
the
true
(low)
or
Drive
to
lines
more
four
the
by
output
and
to
(low)
at
units
Select
a
means
lines
controller.
a
select
0
through
of
the
them.
state
a
time.
to
be
four
drivers
drive
A
are
lines
terminated.
of
selecting
select
shunt
3
drives
receivers
Drive
until
An
undefined
assigned
are
one
on
provide
are
Select
a
in
of
the
to
open
Step
the
the
a
3.3
OUTPUT
CONTROL
LINES
The
Output
Drive
controller,
fault,
vided
The
Output
capable
logical
measured
high
am~s.
3.3.1
When
the
jumper
logically
the
selection
Select
and
as
an
of
low
at
(false),
See
Drive
on
ONLY
Control
such
line
output
Control
sinking
(true)
the
Figure
Drive
the
low
status
line.
as:
ready.
the
8
Selected
Selected
shunt
(true).
ONE
lines
drive
to
lines
a
level,
driver.
collector
for
of
DRIVE
They
In
the
controller
use
maximum
with
the
pack,
This
the
MAY
are
send
enabled
status
selected,
addition,
an
open
of
a maximum
When
the
cutoff
recommended
lines
line
the
coincide
Select
informs
drive.
NOTE
BE
SELECTED
seek
the
for
collector
forty
gate
by
information
complete,
Index
timing
milliamperes
voltage
is
off
is
a maximum
circuit.
with
Status
the
AT
A
their
gate
or
the
host
TIME.
respective
to
Track000
line
is
information.
that
of
0.4
logically
of
250
selected
line
goes
system
the
pro-
in
volt
is
a
u
of
3.3.2
~he
Seek
have
sequence.
the
in
end
two
1.
2.
3.3.3
The
Track
read/write
line
tioned
moved
Seek
settled
of
cases:
A
recalibration
drive
not
over
Five
leading
pulses.
Track
goes
on
away
Complete
Complete
on
This
a
normal
logic
Track
hundred
edge
000
000
heads
logically
Track
from
Track
status
at
line
are
line
the
seek.
power
000.
nanoseconds,
of
a
indicates
positioned
low
000.
000,
indicates
selected
line
sequence
on
step
(true)
It
the
is
It
is
because
pulse
on
only
remains
outermost
track
set
to
that
logically
set
is
typical,
or
of
the
Track
When
low
the
at
logically
initiated
the
heads
a
host
000.
the
until
data
read/write
the
after
series
system
heads
track.
end
zero
high
are
The
the
of
of
(true)
(false)
by
the
step
that
Track
are
heads
heads
a
posi-
seek
at
the
000
are
3-5
3.3.4
Fault
The
Fault
exists
writing
Write
pro-hibited
under
are
grossly
3.3.5
In
conjunction
line
read,
Line
indicates
write
Ready
seconds
high
the
and
(false)
motor
seeking
3.3..6
An
index
nominal)
troller.
logically
leading
timing.
on
on
Data
which
after
to
edge
line
the
the
is
until
out
Line
or
line
is
is
Index
pulse
The
low
indicates
disk
disk.
inhibited
the
of
Ready
with
to
seek,
power
if
the
too
inhibited.
is
indicate
transition
(true)
of
drive
When
the
condition
Fault
tolerance.
the
the
and
goes
logically
on.
drive
slow.
provided
the
is
the
pulse
to
this
and
line
Seek
host
that
The
is
When
the
that
line
further
goes
Complete
system
all
Line
not
this
once
beginning
from
the
only
must
host
is
is
corrected.
true
I/O
low
Ready
selected
line
every
logically
be
system
going
is
logically
writing
is
that
signals
(true)
is
of
valid
used
that
to
cause
on
that
line,
the
the
disk
are
approximately
line
or
goes
if
false,
revolution
a
track
high
transition.
to
ensure
a
low
the
The
D.C.
valid.
the
all
to
condition
improper
(true),
disk
condition
voltages
Line
drive
logically
speed
writing
(16.67
the
(false)
accurate
is
Ready
can
The
15
of
ms
con-
to
The
3.4
The
Data
system
lines
when
The
of
lines
contains
for
data
3.4.1
The
provide
on
the
are
us
ing
MFM
MFM
DATA
Transfer
and
the
differential
Drive
Write
are
q
typical
transfer
MFM
Write
the
track
TRANSFER
disk
Data
provided
Write
data
to
lines
drive
Se
lect
.0
pair
driver/receiver
signals.
Data
Data
to
be
lines
be
written
LINES
transfer
when
in
of
for
stored
nature.
lines
the
are
is
3-6
information
the
and
transfer
the
on
the
caused
drive
They
the
circuit
differential
track.
When
of
is
may
MPM
data.
between
selected.
be
multiplexed
Read
Data
Figure
combination
pair
A
flux
the
plus
the
host
These
pair
used
that
reversal
(+)
9
MFM
20
FT
~1IIIIllII
I (6.1 MI
I FLAT
i TWISTED PAIR
MAXIMUM
RIBBON
+
SIGNAL
OR
CABLE
~
~
I
HIGH
------I
TRUE
26LS31
EQUIVALENT
Write
Write
~ogically
the
are
host
in
attained
negative
Data
Data
the
than
OR
low
system
by
Data
line
line,
(true).
inactive
making
the
Line
goes
provided
must
minus
-
SIGNAL
Figure
Driver/Receiver
more
When
the
ensure
state.
the
MFM
plus
Write
9
positive
that
disk
that
The
MFM
Data
the
the
drive
Circuit
than
Write
MFM
inactive
Write
line.
26LS32
EQUIVALENT
the
is
in
write
Data
OR
minus
Data
a
R~ad
data
state
line
>---
line
signals
(-)
can
HIGH
TRUE
MFM
is
mode,
be
more
3.4.2
These
previously
to
be
more
positive
quently,
host
system
lines
read
MFM
written
the
via
Read
are
Data
a
on
is
caused
than
differential
the
MFM
differential
a
track.
When
the
minus
pair
Read
3-7
the
Data
pair
A
flux
plus
MFM
signal
lines.
that
reversal
MFM
Read
is
recover
Read
Data
Data
transmitted
on
line.
the
the
line
data
track
goes
Subseto
the
APPENDIX A
CUSTOMER
INFORMATION BULLETINS
CUSTOMER
TM600 RIGID DISK DRIVE
INFORMATION
BULLETIN
RAMPED
Tandon
changes
is
an
be
of
Our
current
steps
last
time
step
of
Customer
time.
timing,
A.
In
I.
2.
SEEK
uses
in
and
option
interest
of
three
and
170
milliseconds
requirements
By
using
the
present
order
The
187045-001.
The
circuit
MODE
a
Customer
improvements
on
the
in
your
drives
(3)
settling
the
to
use
drive
Pins
board
Information
~andon
application.
are
designed
milliseconds.
time,
for
may
ramped
drive's
a
ramped
must
8
and
must
have
9
be
Bulletin
to
our
products.
TM600
family
to
Given
this
the
step
153
necessitate
seek
average
seek,
a
four
Control
programming
closed
operate
eighteen
rate
cylinder
mode
access
major
(shorted).
of
a
and
time
and
shunt
to
inform
The
rigid
at
a
results
drive.
reduction
giving
can
conditions
Data
of
our
following
disk
minimum
(18)
milliseconds
in
correct
be
circuit
the
Control
customers
information
drives
time
an
average
in
average
step
improved.
must
board,
that
between
pulse
be
met:
and
of
may
for
seek
seek
pIN
Data
B.
3.
4.
The
The
viscous
The
controller
algorithm
in
ramped
pulse
Two
pulses
one-track
equal
timing
to
fourteen
damper
below.
seek.
for
separated
seek
must
must
Note
be
issue
that
single-track
by
1.5
is
equal
pulses.
mounted
step
two
to
pulses
pulses
nine-track
milliseconds
to
two
pulses,
A-I
to
the
stepper
in
accordance
per
for
a
motor.
track
seek
each
are
is:
track,
nine-track
with
required
i.e.,
seek
the
a
is
c.
Pulse
1.
Acceleration
2.
Slew
3.
Deceleration
timing
Phase:
for
an
10
Phase:
two
each
Phase:
track
pulses
track.
last
seek
_---+-,_+----I-~---+-----+--_.J
separated
two
or
tracks
greater.
by
.75
or
l.
0
milliseconds
seek.
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for
If
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have
any
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LAST
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15
questions
contact
ml
s
me.
PULSE
2.5
or
OF
SLEW
!I
ms
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need
additional
PHASE
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information,
please
do
A-2
APPENDIX B
SCHEMATICS
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