Honeywell FocusPRO 6000 Series User manual

033190
AND
0331903
DISK
Honeywell
STORAGE
SUBSYSTEM
REFERENCE
MANUAL
SERIES
6000
SUBJECT:
General
Description,
Functional
Description,
and
Operating
Instructions
for
the
DSSl90
and
DSSl90B
Disk
Storage
Subsystems.
SPECIA
L
INSTRUC
TIONS:
This
manual
supersedes
the
previous
edition,
Revision
2,
dated
May
1974.
This
edition
includes
Series
6000
disk
storage
equipment
only.
Since
the
contents
of
the
manual
have
been
extensively
revised,
change
bars
and
asterisks
have
not
been
us
e
d.
DATE:
-
January
1975
ORDER
NUMBER:
0337,
Rev.
3

PREFAC
E
This
manual
is
a
reference
document
providing
hardware-oriented
descriptive
and
instructive
material
for
users
of
the
DSSI90
and
DSSI90B
Disk
Storage
Subsystems
and
for
others
concerned
with
their
technical
aspects,
application,
or
operation.
The
basic
difference
between
DSSI90
and
DSSI90B
is
the
use
of
different
disk
pack
drives
A
physical
description
of
each
type
of
disk
pack
drive
is
located
in
Section
I.
The
manual
is
divided
into
three
sections:
Section
I
contains
a
general
description
of
the
hardware
used
in
the
subsystem,
includingits
performance
specifications,
capabilities,
and
optional
features.
Section
II
contains
a
description
of
the
specific
functions
performed
by
the
subsystem,
including
data
formats,
instructions,
and
status
conditions.
Section
III
contains
a
description
of
the
operator-accessible
controls,
switches,
and
indicators,
and
the
procedures
necessary
to
enable
personnel
to
operate
the
subsystem.
The
following
manuals
supplement
the
information
contained
in
this
manual:
Series
600/6000
Macro
Assembler'Program
(GMAP),
Order
Number
BN86
Series
600/6000
DAT’ANET
355
Communications
Processor,
Order
Number
B803
Series
6000
System
Startup
and
Operation,
Order
Number
DA06
Series
6000
Equipment
Operator's
Manual,
Order
Number
DA33
©1972,
1973,
1974,
1975,
Honeywell
Information
Systems
Inc.
File
N0-1
1703
DB3?

Section
I
Section
H
CONTENTS
GeneralDescription
.................................
SubsystemConfiguration
..............................
SubsystemComponents
................................
DiskStorageControl(DSC)
..................
DiskPackDrives
.......................
DiskPack
......
0......
0.0.0....00
0.0.0.0000.
FunctionalDescription
.......................
ComponentFunctions
...
LinkAdapter(LA)
.................................
DiskStorageControl(DSC)
.........................
DiskControlAdapte-r(DCA)
.........................
DiskStorageUnit(DSU)
................
.......
......
DiskPack
...............
......
..........
BasicTrackFormat
............................
DiskPackCapacity
..............................
Increased
Capacity
Format
(ICF)
.................
InstructionSet
..............
Instructions........................................
Seek
...........................................
SpeciaISeek..............
Preseek
.......
Restore
..........
Read
ReadASCII
Write
WriteASCH
WriteandCompare
ReadNonstandard
SizeSector
.....................
ReadTrackHeader
..............................
FormatTrack
...................................
RequestStatus
..................................
ResetStatus
....................................
WriteControlRegister
......
ReadControlRegister
...........................
ReadStatusRegister
...
Release
......
ReadEDACRegister
....
ReserveDevice
.........Q........................
SetStandby
.................................l....
BootloadControlStore
...........................
ITRBoot
.........................................
ExecuteDevice
..................................
Execute
Microcoded
Device
(MD)
Routine
.
.
.
. .
.
.
.
.
.
Write
Control
Main
Memory,
Binary
or
ASCII
.
.
.
.
.
.
Read
Control
Main
Memory,
Binary
or
ASCII
.
. .
.
.
.
Conditional
Write
Lock
Byte,
Write
Lock
Byte
.
.
.
.
.
.
IIOIIOOIOOOIOO...
......
...
OOOOCOOOOOOIOOOUIOOOOOO
...0.......OCCOOOOOOOOIOOII.I.
000......-OIQOOOOOOQQOOIOOIQO-O-poo.
000.000.000.00...000.00.000.90...
iii
a
Page
...-5
I
5—:
HHHHI—n
III!
nun
Lndimww
NNNNNNNNNNN
I
HHNIO‘U'IJBubrhIFD-‘H
O
O
...:
l
5—.
NN
ll
I—nt—o
I—‘D—I
2-13
2-13
2-13
2-13
2-13
2-13
2-14
2-14
2-14
2-14
2-15
2-15
2-15
2-15
2-16
2-16
2-16
2-17
2-17
2-17
2-17
2-17
2-17
2-17
2-17
2-17
2-18
DB3?

Se
ction
II
(cont)
CONTENTS
(cont)
IRead
Lock
Byte
...............................
SuspendControl
ReleaseControl
.....................'.‘.........
SendSpecial
Interrupt
........................'..
ReadLogicalChannélNumber................—....
MajorStatusandSubstatus”.......................
Channellieady
.................................
NoSubstatus................................
Retries
Devicein
T&DMode
.........................
DataCorrected
..............................
IDevicelBusy
...................................
Device
Positioning
..........................
Alternate.
Channelin
Control
.................
Attention.........,....‘........................
Write
Inhibit................................
SeekIncomplete
.............................
Device
Inoperable............................
DeviceinStandby
DeviceOffline
...
DataAlert...........'.....'.............v........
Transfer
TirningAlert.......................
Transmission
ParityAlert
...................
InvéJidSeekAddress......g..................
Header
VerificationFailure...................
Check
CharacterAlert.......................
CompareAlert
..............................
EndofFile
...............................‘.....
GoodTrackDetected.........................
LastConsecutive
Block
......................
Enock:CountIinfit
...........................
Defective
Track
Detected,
Alternate
Assigned
.
.
Defective
Track
Detected,
No
Alternate
As
signed.
Alternate
TrackDetected.....................
InstructionRejected
...........................
InvalidOperationCode
......................
InvalidDeviceCode
.........................
Par’ityAl'ertonIDCW
.;......................
Invalid
Instruction
Sequence
..................
MPC
DeviceAttention
ConfigurationError..........................
Multiple
Devices
.....;......................
DeviceNumberError
.......................
(LAjError............;......................
AlertEN—l
.................................
CA
EN-l
Error
..
CAAlertNoEN-l
....-.......................
MPCDevice
DataAlert
.........................
TransmissionParityError
.
Inconsistent
Command
....
Checksunnlflrror
............................
ByteLLockout................................
EDAC
ParityError
.........................
Sector
Size
Error
......................i.....
NonstandardSectorSize
.....................
Search
Alert
”First
Search"
..................
Cyclic
Code
Error
"Not
First
Search”
.........
iv-
2-18
2—18
2-18
2-18
2-18
2—18
2-18
2-18
2‘20
2-20
2—20
2-20
2-21
2-21
2~21
2-21
2:21
2-21
2-21
2-21
2-21
2-22
2-22
2-22
2—22,
2-22
2-22
2-22
2-23
2-23
2-23
2-23
2-23
2-23
2-23
2-23
2—24
2-24
2—24
2-24
2-24
2—24
2-24
2—24
2—24
2-25
2-25
2-25
2-25
2-25
2~25
2-25
2-25
2-25
2-25
2-26
2-26
DB3?

CONTENTS
(cont)
Page
SectionII
(cont)
SearchAlert”NotFirstSearch”
..............
2-26
SyncByteError
............................
2-26
AlternateTrackError
.......................
2-26
EDAC
Correction
—
Last
Sector
..
..
.
.
.
.
.
.
.
.
.
.
2-26
EDAC
Correction—NotLastSector
..........
2-26
EDAC
Correction
--
Block
Count
Limit
,
.
,,,
,
,
2-26
EDACUncorrectable
........................
2-26
EDAC
Correction
-
Short
Block
..
. .
..
.
.
.
.
. .
.
.
2-26
MPCCommandReject
..........................
2-26
IllegalProcedure
...........................
2-26
Illegal
Logical
Channel
Number
.
. .
.
.
. .
.
.
.
.
.
.
.
.
2-27
IllegalSuspend
..............................
2-27
ContinueBitNotSet
.........................
2-27
SectionIII
OperatingInstructions
..................................
SubsystemConsiderations
............................
Subsystem
Controls
and
Indicators
.....................
DSC
Operating
Controls
and
Indicators
..............
AC
BreakerOn
.................................
PowerOn
...................l..................
PowerOff
.....................................
Normal/Test
..................................
Ready/Trouble
................................
OverTemp/AlarmReset
.......................
Start
.........................................
Automatic/Manual
Int/Ext/ContStore
................
Operator
Interrupt
...
.
.
.
.
..
.
Halted
Initialize
......................
Address/Simulate
.............
Control
Configuration
Switches
.
.
.
.
.
.
.
.
.,
.
.
.
.
.
.
.
.
.
.
.
DSU190
Operating
Controls
and
Indicators
,,
,
,
,
,
,,
,
,,
DSU19OB
Operating
Controls
and
Indicators
.
..
0
.
..
.
.
.
SubsystemOperation
.................................
DSC
Operation
....................................
DSUOperation
....................................
DSU19OInitialization
...........................
DSU19ODiskPackInstallation
...................
DSUl90DiskPackRemoval
.....................
DSUl90BInitialization
..........................
DSU19OBDiskPacklnstallation
.................
DSUl90BDiskPackRemoval
....................
EmergencyOperation
.............................
wwwwwwww
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i—IH
I—IO
SubsystemMaintenance
..............................
3-11
DSC/DSUMaintenance
3-11
DiskPackMaintenance
............................
3-11
Handling
the
DiskPack
...
3-11
StoringtheDiskPack
3-12
7/78
v
DB37A

Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Table
Table
Table
Table
Table
Table
Table
2
2
2
Table
2
2
3
3
3
Z-IOD.
2-11.
2—12.
2-13.
2-14.
3-1.
3-2.
3-3.
3-4.
3-5.
ILLUSTRATIONS
BasicSubsystem
.......................................
lé—DeviceSubsystem
...................................
DualControlSubsystem
.................................
Dual
Subsystem
with
Four
Simultaneous
Channels
.
. .
.
. .
.
.
.
DiskStorageControl(DSC)
..............................
DiskPackDriveDSUl90
................................
DiskPackDriveDSU190B
...............................
DiskPack
....................
DSS
190
or
DSS
190B
with
Six
Additional
Devices
and
a
SwitchedChannel
.....................................
DSS
190
or
DSSl90B
with
14
Additional
Devices
and
Two
Simultaneous
Channels
.................................
Dual
Control
(Two
Single
Channels)
Crossbarred
Subsystem(DCX)
..........-...........................
Two
Control
Dual
Channel
Crossbarred
Subsystem
.
.
. .
,
.
.
. .
DiskPackRecordingSurfaces
.
BasicTrackFormat
.
HomeAddressField
..
ROField
....
RlField
.......
IncreasedCapacityFormat(ICF)
........................
COCountField
DataFields
...........................................
CNCountField
......
SeekInstructionFormat
................................
TrackHeaderFormat
FormatTrackDataFormat
................
......
.......
ReadControlRegisterFormat
....................
DSC
Operating
Controls
and
Indicators
(Freestanding
Control)
...........................
.....
....
Operating
Controls
and
Indicators
(Control
Integrated
inICU)
..............................................
ControlConfigurationSwitches
..........................
DSU19O
Operating
Controland
Indicators
.................
DSU190B
Operating
Controls
and
Indicators
...............
OCOOCIOOOOIOOICIOOCOIOOO
0.00....OOOOII'COUCCIOOICOOOIICOCOOCOOCICC
.CCIOOOCOOOUOOIU...O'COOOOOOC..II.IOIOO
Coco...-IO...OOOOOOOIOGC000000-000300000
.00...
con...
TABLES
Functional
Characteristics
of
the
Disk
Storage
Unit
.
.
.
.
.
.
.
.
DiskPackCapacity
(Basic
TrackFormat)..................
InstructionSet
.........................................
SpecialInstructionSet
..................................
MajorStatusandSubstatusCodes
........................
Control
Configuration
Switches
DSUl90ControlsandIndicators
..........................
DSUl90BControlsandIndicators
...................}.....
OIOOOOOOOOOOOOOOOOOOQO0000
vi
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I
N
I
2-16
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DB37

SECTION
I
GENERAL
DESCRIPTION
The
Type
DSSl90
and
Type
DSSI
90B
Disk
Storage
Subsystems
are
high-capacity
disk
storage
subsystems
with
advanced
microprogrammed
control
and
operating
features
that
im-
prove
time
and
throughput.
This
subsystem
provides
fast
access
and
large
capacity
storage
for
remote
access,
multiprocessing,
and
time
sharing
in
medium
to
large
data
base
systems.
SUBSYS
TEM
CONFIGURATION
The.
basic
subsystem
consists
of
a
disk
storage
control
(DSC)
and
two
disk
pack
drives
using
removable
and
interchangeable
disk
packs
(see
Figure
l—l).
Storage
capacity
is
117,
903,
360
six-bit
characters
or
78,
602,
240
eight-bit
bytes
per
disk
pack
(or
91,
375,104
six-bit
characters
or
68,
531,
328
eight-bit
bytes
using
a
basic
track
format).
This
capacity
can
be
expanded
by
the
addition
of
up
to
16
devices
(see
Figure
l—Z),
or
32
devices
for
maximum
online
capacity
using
a
single
or
dual
subsystem
(see
Figure
1-3).
Figure
1—4
presents
a
further
expansion
making
use
of
a
dual
control
subsystem
with
four
simultaneous
channels.
Disk
Pack
Drives
with
DSC
Removable
DiskPacks
Data
chem?“
—
1
2
Figure
1-1.
Basic
Subsystem
DSC
Disk
Pack
Drives
with
Removable
Disk
Packs
Data
‘—
._.
_____
_
Channel
Figure
1-2.
l6-Device
Subsystem
l-l
DB3?

DSC
Disk
Pack
Drives
with
Removable
Disk
Packs
Data
«1-—
—————
-—
—e
Channel
V‘-
run—I
1
2
3
16
DSC
Data
t
n
~~~~~~
~
Channel
1
2
3
16
Figure
1—3.
Dual
Control
Subsystem
Data
Data
Data
Data
Channel
Channel
Channel
Channel
LA
LA
LA
LA
DSC
DSC
DCA
DCA
A
DCA
1
-
8
9
-
16
17
-
24
25
-
32
NOTE:
LA
'-
Link
Adapter
DSC
-
Disk
Storage
Control
DCA
-
Disk
Control
Adapter
Figure
1-4.
Dual
Subsystem
with
Four
Simultaneous
Channels
1-2
DB3?

Subsystems
can
be
easily
upgraded
in
the
field
by
adding
the
various
optional
com-
ponents
available.
This
modularity
makes
it
possible
to
provide
backup
components
for
every
module
in
the
subsystem
with
a
maximum
of
versatility.
SUBSYST
EM
COMPONENTS
Disk
Storage
Control
(DSC)
The
DSC
is
a
general
purpose
microinstruction
processor
housed
in
a
single
low-profile
cabinet
with
an
easily
accessible
operator
panel
(see
Figure
1—5))
or
in
the
Integrated
Control
Unit
(ICU).
The
modular
design
of
the
DSC
allows
expansion
and
enhancement
of
basic
sub—
system
capacity
simply
by
installing
optional
hardware.
In
addition
to
the
loperator
panel,
the
DSC
includes:
0
A
maintenance
/
configuration
panel
0
Forced-air
cabinet
cooling
system
0
Power
supply
and
power
control
modules
0
A
basic
disk
channel
with
a
link
adapter
interface
to
the
external
user
system
(EUS)
0
An
Additional
Drive
Electronics,
ADE190,
with
a
disk
interface
to
the
disk
pack
drives.
The
disk
interface
can
connect
up
to
four
disk
pack
drives
to
the
DSC
PHYSICAL
SPECIFIC
ATIONS
Dimensions
51
in.
high
55
in.
Wide
28
in.
deep
Installed
Weight
500
lb
Square
Footage
(including
door
swing)
30.
5
sq.
ft
OPERATING
ENVIRONMENT
$1
/
Temperature
50°
-
100°
F
(10°
..
38°C)
“Hlm//
Humidity
10%
-
85%
.
”Hm
POWER
REQUIREMENTS
\
/
\
120/208
V,
60
Hz
1.
83
kVA
AIR
CONDITIONING
4650
Btu/hr
Figure
1-5.
Disk
Storage
Control
(DSC)
1-3
DB3?

Options
to
the
DSC
include:
o
A
Dual
Simultaneous
Channel,
DCH190
and
DCHI9OB,
consisting
of
one
basic
disk
channel,
one
Additional
Drive
Electronics
(ADEIQO
and
ADE19OB)
and
one
data
recovery
module,
for
dual-channel
crossbar
operation
in
which
data
can
be
transferred
between
the
DSC
and
two
disk
pack
drives
simultaneously.
0
An
Additional
Data
Channel,
ADC190
and
ADC190B,
provides
a
second
link
adapter
interface
to
the
external
user
system
(EUS)
for
transferring
data
between
the
DSC
and
EUS
on
both
interfaces,
but
not
simultaneously.
One
ADC190
or
ADCI9OB
may
be
applied
to
the
DSC
and
one
to
the
optional
Dual
Simultaneous
Channel,
DCH190
or
DCH190B.
o
For
two
controls
with
single
channels,
a
Dual
Control
Crossbar,
DCX190
and
DCX190B,
and
a
disk
Control
Adapter,
CCA19O
and
CCAIQOB,
are
required
to
provide
crossbarring
to
all
drives.
0
For
two
controls
with
dual
channels,
DCH190
and
DCHI
90B,
crossbarring
is
provided
to
all
drives.
(DCX190
or
DCX190B
is
not
required.
)
Disk
Pack
Drives
The
disk
pack'dri've
used
by
the
subsystem
is
either
the
DSU190
or
the
compatible
DSU190B
Disk
Storage
Unit.
The
DSU190
(Figure
l
-6A)is
an
electromechanical
disk
pack
drive
with
a
single
mounting
spindle
housed
in
a
low-profile
cabinet.
The
DSUIQOB
(Figure
l-6B)’is
a
single-spindle,
moving
-head
disk
pack
drive,
with
associated
Device
Oriented
Electronics
(DOE)
housed
in
a
single
low-profile
cabinet.
Both
disk
pack
drives
include
easily
accessible
chambers
for
mounting
the
disk
pack
and
convenient
operator
control
panels.
PHYSICAL
SPECIFICATIONS
Dimensions
38
in.
high
22
in.
wide
49
in.
deep
Installed
Weight
700
1b
Square
Footage
(including
door
swing)
12
sq.
ft
OPERATING
ENVIRONMENT
{Temperature
60°
-
90°
F
(15°
-
32°
C)
Humidity
20%
-
80%
POWER
REQUIREMENTS
208
V,
60
Hz/ZZO
V,
50
Hz
1.
S
kVA
AIR
CONDITIONING
442
5
Btu/hr
Figure
l-6A.
Disk
Pack
Drive
(DSU190)
1-4
.
.
D337

PHYSICAL
SPECIFICATIONS
Dime
nsions
Installed
Weight
Square
Footage
0
PERATING
ENVIRONMEN
T
Temperature
60°
-
90°
F
(15°
-
320
C)
Humidity
20%
-
80%
POWER
REQUIREMENTS
42.25
in.
high
35
in.
wide
30
in.
deep
850
lb
15
sq
ft
208
V,
60
Hz
2.0
kVA
Figure
l-6B.
Disk
Pack
Drive
DSUI9OB
In
addition
to
the
disk
pack
chamber
and
operator
Control
panel,
the
disk
pack
drive
includes:
Disk
Pack
The
disk
pack
rotating
mechanism
The
mechanism
that
positions
the
read/write
heads
with
respect
to
the
disk
recording
surfaces
-
The
brush
mechanism
that
cleans
the
disk
recording
surfaces
during.
each
power-up
sequence
Two
ports
that
permit
the
disk
pack
drive
to
be
connected
for
simultaneous-
dual-channel
crossbar
operation
‘
Direct
current
power
supplies
and
power
supply
controls
The
Disk
Storage
Subsystem
uses
an
M4050
Disk
Pack
or
an
equivalent
removable
disk
pack
(see
Figure
1-7).
The
disk
pack
includes
ten
14-inch
storage
disks
and
two
protective
disks
mounted
on
a
common
hub,
and
an
easy-to-handle
plastic
carrying
storage
case.
The
disk
pack
can
be
removed
conveniently
for
offline
storage,
and
may
be
remounted
readily
for
online
processing.
l-S
DB3?

PHYSICAL
SPECIFICATIONS
Disk
Dimensions
14
in.
diameter
Number
of
Disks
12
Storage
Disks
(spaced
0. 3
in.
apart
on
a
common
hub)
2
protective
disks
(on
same
hub)
Number
of
Storage
Surfaces
l
9
Data
1
Servo
Weight
20
lb
(with
carrying
case)
OPERATING
ENVIRONMENT
Temperature
_
15°
-
32°
C
Humidity
20%
-
80%
STORAGE
CAPACITY
91,
375,
104
six-bit
characters
68,
531,
328
eig'htnbit
characters
Figure
1-7.
Disk
Pack
1-6
DB3?

SECTION
II
F
UNC
TIONAL
DESC
RIPTION
COMPONENT
FUNC
TIONS
The
Disk
Storage
Subsystem
may
be
configured
in
many
different
ways
to
obtain
data
availability
and
throughput
requirements.
Versatility,
especially
adaptability
to
new
require-
ments,
is
significantly
increased
by
the
use
of
a
microprog
rammed
peripheral
control
as
the
disk
storage
control
(DSC)
for
the
subsystem.
The
disk
storage
units
(disk
pack
drives
and
disk
packs)
communicate
with
the
DSC
across
a
radial
interface
that
permits
a
DSU
to
be
removed
from
service
without
interfering
with
the
operation
of
other
DSU's
in
the
subsystem.
Four
of
various
subsystem
configurations
that
may
be
used
in
a
computer
system
are
shown
in
Figures
2
--1
through
2
-4.
The
abbreviations
used
are:
ADE
-—
Additional
Drive
Electronics
CCA
or
CA
-—
Control
Adapter
DCA
-—
Disk
Control
Adapter
DCX
—
Dual
Control
Crossbar
(includes
associated
cables
and
additional
EDE
electronics)
DSC
~—
Disk
Storage
Control
(refers
to
the
complete
control)
DSS
—-
Disk
Storage
Subsystem
DSU
—-
Disk
Storage
Unit
(refers
to
the
DSU190
and
DSU190B
Disk
Storage
Units
unless
noted
otherwise)
EDAC
-
Error
Detection
and
Correction
EDE
~—
Extended
Drive
Electronics
EUS
-—
External
User
System
(refers
to
any
Series
6000
Central
System
or
DATANET
355
Front—End
Network
Processor)
IDCW
—
Instruction
Data
Control
Word
LA
-—
Link
Adapter
OPI
«—
Operational
In
(a
status
line
from
the
device
to
the
controller
indicating
the
operational
status
of
the
device)
2-1
DB3?

EUS
EUS
DSC
Figure
2
-l
.
DSSl90
or
DSSl
90B
with
Six
Additional
Devices
and
a,Switched
Channel
EUS
EUS
ILA
LA
.
DSC
Figure
2-2..
D581
90
or
DSSI90B
with
14
Additional
Devices
and
Two
Simultaneous
Channels
2-2
-DB37

rfi._*m~—n—————u——1
EUS
I
l
/‘“f‘\.
LA
DSC
DCA
CCAa
ADE
IEDE
ADEalEDE
PI..-
8
DSS
190
or
D55
1
90B
"
24
LA
DSC
a
DCA
CCA
ADE/EDE
ADEa/EDE
9
.
16
2‘3
D851
90
or
DSSI
90B
32
aRequired
with
17
or
more
drives
Figure
2-3.
Dual
Control
(Two
Single
Channels)
Crossbarred
Subsystem
(DCX)
r*“‘—“"’"""—“'_"—I
F'“—""'"__'""—-l
IOM
A
I
IOM-B
I
:::;P*“fifi::)m<:fi::znfl—_4
LA
LA
LA
LA
DSC
DSC
DCA
DCA
DCA
I
DCA
ADE/Egg
ADE/AEDE
ADE/EDP:
I
ADE/EDIE
p
“a
I,
-__|
._._.
l7
8
D58
1
90
or
DSS
190B
49
9
7‘<
@D
@D
16
25
D85
1
90
or
D58
1
90B
Figure
2-4.
Two
Control
Dual
Channel
Crossbarred
Subsystem
2-3
32
DB3?

Link
Adapter
(LA)
The
LA
connects
the
DSC
to
the
EUS
as
shown
in
Figure
2
-I
through
2-4.
Each
LA
has
two
ports,
providing
the
ability
for
the
LA
to
be
shared
by
two
physical
interface
channels
for
nonsimultaneous
transfer
of
data
between
the
EUS
and
the
DSC.
Channel
switching
is
con-
trolled
by
the
DSC
microprograms.
Disk
Storage
Control
(DSC)
The
DSC
is
a
general
purpose,
register~to—register
microinstruction
processor
that
performs
the
control
functions
far
the
subsystem.
The
DSC
accepts
macro
instructions
from
the
EUS
and
issues
the
necessary
'machine
instructions
to
the
DSU's
via
the
DCA.
The
DSC
also
obtains
status
from
the
DSU's
and
returns
the
appropriate
status
to
the
EUS.
Four
ports
are
provided
in
the
DSC
for
connecting,
as
many
as
two
LA's
and
two
DCA's
Disk
Control
Adapter(DCA)
The
DCA
connects
the
DSC
to
the
DSU's
through
the
Additional
Drive
Electronics
(ADE/EDE)
as
shown
in
Figures
2-1
through
2
-4.
The
DCA
synchronizes,
buffers,
and
converts
information
to
be
transferred
between
the
DSC
and
the
DSU's.
Information
is
transferred
by
the
DCA
to
or
from
only
one
DSU’at
a
time.
Two
independent
DCA’s
each
can
transfer
information
to
or
from
different
DSU's
simultaneously.
Disk
Storage
Unit
(DSU)
The
DSU
is
a
disk
pack
drive
capable
of
reading
from
or
writing
in
bit
serial
form
on
any
of
the
tracks
of
a
l9~recording
surface,
411
-track
removable
disk
pack.
To
be
inter-
changeable,
all
disk
packs
must
be
aligned
with
the
same
.master
alignment
pack.
Two
channels
in
the
DSU
permit
the
DSU
to
be
connected
to
two
DCA's
for
simultaneous
data
transfer
operations
between
the
DSU
and
the
EUS.
DSU
functional
characteristics
are
listed
in
Table
2
-l.
2
-4
DB3?

Table
2
-1.
Functional
Characteristics
of
the
Disk
Storage
Unit
Characteristic
Removable
Disk
Pack
Spindle
Rotation
Disk
Latency
Time
Heads
R/W
Heads
Loading
Mechanism
Servo
Heads
Recording
Mode
Data
Rate
Density
-—
outer
track
Density
-
inner
track
Head
Positioning
Timesa
(Track-to-Track)
W
M4050
(or
equivalent)
3600
rpm
8.
3
ms
(average)
16.
7
ms
(maximum)
1
9
Ramp
1
Modified
Frequency
Modulation
(MFM)
806,
000
bytes
per
second
Z684
bpi
4040
bpi
55
ms
(maximum)
30
ms
(average)
10
ms
(minimum)
aDoes
not
include
disk
latency
time
or
time
to
read
data.
Average
head
selection
time
=
6
(1
s
Disk
Pack
The
disk
pack
used
with
the
DSU
is
a
removable,
interchangeable
disk
with
19
magnetic
recording
surfaces
numbered
0
—
18
(see
Figure
25).
Each
recording
surface
has
411
concentric
tracks
for
a
maximum
total
of
7809
tracks.
The
tracks
on
each
recording
surface
are
numbered
000
-
410,
track
number
410
being
the
innermost.
A
group
of
19
tracks
(tracks
with
the
same
number
for
each
of
the
19
recording
surfaces)
constitutes
a
cylinder,
5..
e.
,
tracks
numbered
001
for
each
of
the
19
recording
surfaces
comprise
cylinder
001.
So,
there
are
411
cylinders
for
each
disk
pack.
Cylinders
000
through
409
(7790
tracks)
are
allocated
to
user
data,
system
labels,
catalogs,
alternate
tracks,
and
other
info
rmation;
cylinder
410
(19
tracks)
is
reserved
for
T
&
D
use
only.
Of
the
410
cylinders
available,
404
cylinders
are
addressable,
three cylinders
are
reserved
as
alternate
cylinders,
and
three
additional
cylinders
are
addressable
to
offset
any
tracks
that
are
deallocated.
Z
-5
DB3?

BASIC
TRACK
FORMAT
The
basic
track
format
contains
a
home
address
area,
a
track
descriptor
sector.
and
from
one
to
31
user
data
sectors
per
track
as
shown
in
Figure
2
-6.
Portions
of
the
track
format
are
described
in
more
detail
in
Figures
2
—7,
2-8,
and
2-9
(c
ross‘4referenced
in
Figure
2
-6).
Home
Address
Field
--
Figure
Z~7
R0
Field
--
Figure
2-8
R1
Field
—
Figure
2-9
l
Disk
ll
Surfaces
:
l
19
L-“
~-—-«——.
Figure
2
-5.
Disk
Pack
Recording
Surfaces
2
-6
.
D837

INDEX
GAP
1
now:
GAP
2
no
couw'r
GAP
2
1901191“
92
BYTES
ADDRESS
49
BYTES
ll
}
7
sec
arms
49
BYTES
7
e
7
l-JCC
BYTES
J
V
See
Figure
2-7
See
Figure
Z~8'
R0
DATA
GAP
3
RI
COUNT
GAP
2
R1
DATA
8
+
7
ECC
BYTES
59
BYTES
11
+
7
ECC
BYTES
49
BYTES
288
+
7
ECC
BYTES
MINIMUM
See
Figure
2
-9
I
1
_'1
I
GAP
3
CAP
4
INDEX
LAST
RECORD
DATA
POINT
I
[—
fij
I
Figure
2-6.
Basic
Track
Format
DISK
PACK
CAPACITY
The
storage
capacity
of
a
disk
pack
and
of
the
track
format
are
shown
in
Table
2-2.
Capacity
measurements
include
lengths
of
fields
measured
in
bytes
(8
bits)
,
in
words
(36
bits),
and
characters
(6
bits).
Table
2-2.
Disk
Pack
Capacity
(Basic
Track
Format)
Bytes/
Sector/
Bytes/
Words/
288-Byte
Bytes/Disk
Pack
Formatted
Sector
Track
Track
Sector
Fields
/Track
X
10
Characters/
Disk
Racks
x
106
288
31
8928
64
3‘1
68.
5
91.
3
a
aBased
on
404
cylinders
2
-7
DB3?

8'2
[.280
GAP
1
l.
PRECEDES
ALL
HOME
ADDRESSES
2.
ZEROS
USED
TO
SYNC
P10
3.
DECODING
HEX
l9
SYNC BYTE
INDICATES
PLO
SYNC
AND
THE
BEGINNING
OF
DATA.
SYNC
1D
\
fl
1
CAP
1
HOME
ADDRESS
92
BYTES
7
+
7
E00
BYTES
56"
(
HOME
ADDRESS
FIELD
\
pmsgcgéésncasss
mu;
CYLINDER
CYLINDER
HEAD
HEAD
7
15cc
BYIES
‘flffifi
7
BYTES
USED
FOR
ERRUR
DETECTION
AND
CORRECTION
HOME
ADDRESS
FIELD
1.
DESCRIBES
THE
CONDITION
OF
THIS
TRACK.
2.
CONTAINS
THE
PHYSICAL
ADDRESS
OF
THIS
TRACK.
HEAD
ADDRESS
(0
-
15)
CYLINDER
ADDRESS
(0
-
410)
HIT
0-4
=
ZERO
HIT
5
=
CE
PACK
BITS
6-7:
UH
=
NORMAL
TRACK
01
=
ALTERNATH
TRACK
l“
=
HLFKC1IVH
TRACK
£1
A
HLFHCIIVE
WRACK
BYTI;
|
(tnm‘m'rs
0
LOW
ORDER
CYLINDER
HPAD
—-‘
I
BITS
0'7
0
=
ZERO
l
:
HIGH
ORDER
CYLINDER
ADDRESS
2
=
ZERO
3-7
=
HEAD
ADDRESS
Figure
2-
7.
Home
Address
Field
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