Texas Instruments DS10 Operating instructions

Model 990 Computer
Model DS10
Cartridge Disk System
~~~n'"'
<.~
Installation and Operation
Part No. 946261-9701 *B
15 December 1980
TEXAS INSTRUMENTS

© Texas Instruments Incorporated 1977, 1978, 1979, 1980
All Rights Reserved, Printed in U.S.A.
The information and/or drawings set forth in this document and all rights in and to inventions disclosed
herein and patents which might be granted thereon disclosing or employing the materials, methods,
techniques or apparatus described herein, are the exclusive property of Texas Instruments Incorporated.
MANUAL REVISION HISTORY
Model 990 Computer Model DS10 Cartridge Disk System
Installation and Operation (946261-9701
*8)
Original Issue .................................. .1 December 1977
Change 1
.................................... .15 January 1978 (ECN 419819)
Change 2
.................................... .15 August 1978 (ECN 437233)
Change 3
..................................... 15 March 1979 (ECN 449602)
Change 4 .................................... .15 August 1980 (MCR 000297)
Revision . ...................................... .15 December 1980 (MCR 000440)
I The total number of pages in this publication is 126.
I
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"i1" 946261-9701
PREFACE
This manual provides detailed instructions for installing a Texas Instruments Model DSIO
Cartridge Disk System in conjunction with a properly installed Model 990 Computer. In addition,
it contains information required to program the computer to use the disk system and a
description of the disk system with specific attention to the controls and indicators. The
information is divided
into the following sections:
Section
1 General Description -This section briefly describes the features and major com-
ponents
of the disk system to acquaint the reader with the system.
2 Installation -This section contains step-by-step procedures for unpacking and install-
ing a Model DSIO Cartridge Disk System. Information is also provided to ensure that
the site for the installation is properly prepared prior
to installation of the disk system.
The procedures given in this section presuppose
that the reader is not familiar with
digital electronics.
3 Programming
~ This section presents interfacing information for use by a programmer
in designing a service routine to control the disk system's activity.
4 Operation -This section describes
the controls and indicators of the disk system for
disk system operators, and describes the use of those controls and indicators in the
operation
of the disk system.
Title
Model 990/5 Computer System Hardware User's Manual
Model 990/10 Computer System Hardware Reference Manual
Model 990/12 Computer Hardware User's Manual
Model 990 Computer Model DSIO Cartridge Disk System
Depot Maintenance Manual
Model 990 Computer Programming Card
Model 990 Computer TMS 9900 Microprocessor Assembly
Language Programmer's Guide
iii/iv
Part Number
946294-9701
945417 -9701
2264446-9701
946262-9701
943440-9701
943441-9701
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TABLE OF CONTENTS
Pangrapb Title Page
SECTION 1. GENERAL DESCRIPTION
1.1 General ..................................................................... - ... 1-1
1.2 System Configuration ............................................................ 1-1
1.2.1 TILINE Bus ....... ' ........................................................... 1-2
1.2.2 Disk Controller
............................................................... 1-5
1.2.3 Disk Drives .................................................................. 1-5
1.3 System Operation ............................................................... 1-6
1.4 System Specifications ........................................................... 1-10
2.1
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.5.1
2.3.5.2
2.3.5.3
2.3.6
2.4
2.4.1
2.4.2
2.4.3
2.4.3.1
2.4.3.2
2.4.3.3
2.4.3.4
2.4.4
2.4.4.1
2.4.5
2.4.6
2.4.7
2.4.8
2.4.8.1
2.4.8.2
SECTION 2. INSTALLATION
General ........................................................................ 2-1
Site Requirements ............................................................... 2-2
Mounting Space Requirements for Rack
Mount Disk Drive .......................... 2-2
Mounting Space Requirements for Cabinet
Mount DiskDrive ........................ 2-2
Ac Power Requirements
........................................................ 2-5
Model
990 Computer .......................................................... 2-5
SupportiveEnvironment ....................................................... 2-6
Cabling Restrictions
........................................................... 2-6
Unpacking Instructions ..................... ' ..................................... 2-6
Unpacking Rack
Mount Disk Drive .............................................. 2-6
Unpacking Disk Controller .................................................... 2-12
Unpacking Cabinet
Mount Disk Drive ........................................... 2-17
UnpackingAccessories
.. ~ ..................................................... 2-21
Unpacking, Handling, and Storing Disk Cartridges ................................ 2-21
Unpacking Disk Cartridges .................................................. 2-22
Handling Disk Cartridges
................................................... 2-22
Storing Disk Cartridges ..................................................... 2-23
VoltageConversion Procedures
................................................ 2-24
Installation
.................................................................... 2-24
Installation
of Rack Mount Disk Drive .......................................... 2-24
Installation
of Cabinet Mount Disk Drive ........................................ 2-28
Computer Chassis Preparation for Disk Controller ................................ 2-29
Reconfiguring Access
Granted Circuit for New Chassis Slot
(6- and 13-SlotChassis) ................................................... 2-29
Reconfiguring Access
Granted Circuit for New Chassis Slot
(17-Slot Chassis)
......................................................... 2-34
InterruptConnections
for 6- and 13-S10t Chassis ................................ 2-37
Interrupt Connections
for 17-SlotChassis ...................................... 2-39
Preparation of Disk Controller ................................................. 2-42
Selecting Disk
TILINE Address .............................................. 2-42
Installation
of Disk Controller ................................................. 2-42
Installing Disk System Interconnection Cables .................................... 2-42
Connection
of Disk Drive to Ac Power Source .................................... 2-49
Disk Cartridge Installation
and Removal ......................................... 2-51
Purging
the Disk Drive Air Filtering System .................................... 2-51
Disk Cartridge Installation
.................................................. 2-52
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Paragraph
2.4.8.3
2.4.8.4
2.5
3.1
3.2
3.3
3.4
3.4.1
3.4.2
3.4.2.1
3.4.2.2
3.5
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
3.5.6
3.5.7
3.5.8
3.5.9
3.5.9.1
3.5.9.2
3.5.9.3
3.5.9.4
3.5.9.5
3.5.9.6
3.5.9.7
3.5.9.8
3.6
3.6.1
3.6.2
3.6.2.1
3.6.2.2
3.6.2.3
3.6.2.4
3.6.2.5
3.6.2.6
3.6.2.7
3.6.2.8
TABLE OF CONTENTS (Continued)
Tide Page
Disk Cartridge Removal ..................................................... 2-56
Removal
of Disk Cartridge Following Power Failure or for Emergency ............. 2-58
System Operational Checkout .................................................... 2-59
SECTION 3. PROGRAMMING
General ........................................................................ 3-1
Programming the Disk Controller ................................................. 3-1
Command Control ...................................................... , ....... 3-1
Command Completion ........................................................... 3-1
Command Completion without Interrupts ........................................ 3-3
Command Completion with Interrupts ........................................... 3-3
Command Completion Interrupts .............................................. 3-3
Seek and Restore Completion Interrupts ........................................ 3-3
Control Words Content and Formats ............................................... 3-3
Disk Status, Control Word 0 , ................................................... 3-3
Command Control, Control Word 1 ............................................. 3-4
Formatand Sector, Control Word 2
.............................................. 3-5
Cylinders, Control Word 3 ..................................................... 3-6
Word Count, Control Word4
................................................... 3-6
LSBMemory Address, Control Word 5 ........................................... 3-7
Unit Select and MSB Memory Address, Control Word6 ............................. 3-7
Interrupt and Controller Status, Control Word1 ................................... 3-8
Disk Commands
............................................................. 3-10
Store Registers Command
................................................... 3-10
Write FormatCommand .................................................... 3-10
Read DataCommand ....................................................... 3-12
Write DataCommand
...................................................... 3-13
Read Unformatted Command ................................................ 3-14
Unformatted Write Command ............................................... 3-15
Seek Command ............................................................ 3-15
Restore Command ......................................................... 3-15
Formats and DefInitions ........................................................ 3-16
Definition
of Terms .......................................................... 3-16
Sector Format
............................................................... 3-16
Gap 1
.................................................................... 3-11
Synchronization (Sync) Character
............................................ 3-17
Identification (ID) Words
................................................... 3-11
Error Detection Code(EDC) Number 1 ........................................ 3-18
Gap2 ..................................................................... 3-18
Data
..................................................................... 3-18
Error Detection Code (EDC) Number 2
........................................ 3-18
Gap 3
.................................................................... 3-18
SECTION 4. OPERATION
4.1 General ........................................................................ 4-1
4.2 Controls and Indicators .......................................................... 4-1
4.2.1 Ac Circuit·Breaker ............................................................ 4-1
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Paragraph
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9
4.3
4.3.1
4.3.2
4.3.3
4.3.3.1
4.3.3.2
4.3.3.3
4.3.4
4.3.5
4.3.6
4.3.7
4.3.8
4.4
4.5
4.5.1
4.5.2
4.5.3
4.5.3.1
4.5.3.2
Table
TABLE OF CONTENTS (Continued)
Title Page
Dc Circuit Breaker ............................................................ 4-1
START/STOP Switch/Indicator ............................................... .4-1
READY Indicator ............................................................. 4-2
ACTIVE Indicator ............................................................ 4-2
F
AUL T /RESET Indicator/Switch ............................................... 4-2
WRITE/PROTECT CART Indicator/Switch .................................... .4-3
WRITE/PROTECT FIXED Indicator/Switch ..................................... 4-3
BRU~H Indicator ............................................................. 4-3
Operating Instructions ........................................................... 4-3
Operating Precautions
......................................................... 4-3
PowerApplication for Online Operation .......................................... 4-4
Disk Cartridge Installation
and Removal .......................................... 4-4
Disk CartridgeInstallation
................................................... 4-4
Disk Cartridge Removal
...................................................... 4-5
Removal
of Disk Cartridge Following Power Failure or for Emergency .............. 4-6
Write
Protect ................................................................. 4-6
Stop
and Power Removal ....................................................... 4-6
Changing Disk Assignments
.................................................... 4-7
Fault Operating Procedures ..................................................... 4-7
Operator Preventive Maintenance ............................................... 4-7
MaintenanceAids
............................................................... 4-7
Preventive Maintenance
..................... ~ ................................... 4-11
Preventive Maintenance
for the Rack Mount Disk Drive ............................ 4-11
PreventiveMaintenance
for the Cabinet Mount Disk Drive ......................... 4-11
Preventive Maintenance
for the Cartridge Disk ................................... 4-12
General
........................................... ' ........................ 4-12
Maintenance Procedures
.................................................... 4-13
LIST OF ILLUSTRATIONS
TItle Page
1-1 Model DSI0 CartridgeDisk System ................................................ 1-0
1-2 Model
DSI0 Cartridge Disk Unit Subsystem Simplified Diagram ....................... 1-2
1-3 TILINE Master-to-SlaveWrite CycleTiming ........................................ 1-3
1-4 TILINE Master-to-Slave Read Cycle Timing ........................................ 1-4
1-5 Interconnection of Disk Controller and Two Disk Drives .............................. 1-6
1-6 Model
DSI0 CartridgeDisk Controller (PWB) ....................................... 1-7
1-7 Model
DSI0 Cartridge Disk Controller (Fine Line PWB) .............................. 1-8
1-8 Model
DSI0 Cartridge Disk Drive (Cabinet Mount) ................................... 1-9
1-9 Rack
Mount Disk Drive Physical Dimensions ....................................... I-II
1-10 Cabinet Mount Disk Drive Physical Dimensions .................................... 1-12
2-1 Model DSI0 Cartridge Disk System Components ..................................... 2-3
2-2 Recommended Rack Dimensions for Model
DSI0 Cartridge Disk Drive .................. 2-4
2-3 Physical Dimensions
of Cabinet Mount Model DSIO Cartridge Disk Drive ............... 2-5
2-4 Rack
Mount Disk Drive Shipping Configuration ..................................... 2-7
2-5 Cabinet
Mount Disk Drive Shipping Configuration ................................... 2-8
2-6 Placement
of Disk Drive for Shipping Bolt Removal .................................. 2-9
vii Digital Systems Division

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LIST OF ILLUSTRATIONS (Continued)
Figure Title Page
2-7 Location of Electronics Cover Screws ............................................. 2-10
2-8 Carriage Lock Pin Location ..................................................... 2-11
2-9 Card Cage Cover and Clamp Location ............................................. 2-12
2-10 Disk Drive PWB Locations ...................................................... 2-13
2-11
Control PWB Switch Settings .................................................... 2-14
2-12 Sector PWB Switch Settings ..................................................... 2-15
2-13 Servo PWB Switch Settings ...................................................... 2-16
2-14 Data Recovery PWB Switch Settings .............................................. 2-17
2-15 R/W /E PWB Resistor Module Orientation ......................................... 2-18
2-16 Disk Controller Shipping Configuration ........................................... 2-19
2-17
Disk Controller Standard Jumpers ................................................ 2-20
2-18 Disk Cartridge ................................................................. 2-23
2-19 Voltage Jumper Plug and Connector .............................................. 2-25
2-20 Rack Slide Assembly Mounting ................................................... 2-27
2-21 Rack Mount Slide Configuration (Right Side Only) .................................. 2-28
2-22 TILINE Access Granted Jumper Locations for 6-S10t Chassis (Current Production) ...... 2-31
2-23 TILINE Access Granted Jumper Locations for 13-S10t Chassis (Current Production) ..... 2-32
2-24 TILINE Access Granted Jumpers (P2-5 to P2-6) on the Model 990 Backpanel ............ 2-33
2-25 Interrupt Plug and TLAG Jumper Switches in the 17-S10t Chassis ...................... 2-35
2-26 17-S10t Chassis TLAG Jumper Switch Settings ...................................... 2-36
2-27 Location of Interrupt Jumpers (6- and 13-S10t Chassis) ............................... 2-37
2-28 6-S10t Chassis Interrupt Jumper Plugs ............................................. 2-39
2-29 13-S10t Chassis Interrupt Jumper Plugs ............................................ 2-40
2-30 17-S10t Chassis Interrupt Jumper Connector ........................................ 2-41
2-31 Model DSI0 Cartridge Disk Controller (PWB) ...................................... 2-43
2-32 TILINE Slave Address Switches .................................................. 2-44
2-33 Interconnection Cable Connector Mating .......................................... 2-45
2-34 Interconnection Cable Dressing in Computer Chassis ................................ 2-46
2-35 Cable Adapter. , , .... , ......................................................... 2-47
2-36 Cable Arrangement on Cable Carriers ............................................. 2-48
2-37 XRM (n) Resistor Packs to be Removed from Primary Rack
Mount Disk Drive
I/O Board .................................................. 2-50
2-38 XRM (n) Resistor Packs to be Removed from Primary Cabinet
Mount Disk Drive
I/O Board .................................................. 2-50
2-39 Switches and Settings for Rack Mount Primary Disk Drive ............................ 2-53
2-40 Switches and Settings for Cabinet Mount Primary Disk Drive ......................... 2-54
2-41 Disk Drive Circuit Breakers ...................................................... 2-55
2-42 Brush Indicator ................................................................ 2-56
2-43 Disk Cartridge Installation ...................................................... 2-57
2-44 Cartridge Locks ................................................................ 2-58
3-1 Model DSI0 Disk System Control Word Formats .................................... 3-2
3-2
Control Word 0 ................................................................. 3-3
3-3 Control Word 1 ................................................................. 3-4
3-4 Control Word 2 ................................................................. 3-6
3-5
Control Word 3 ................................................................. 3-6
3-6 Control Word 4 ................................................................. 3-6
3-7 Control Word 5 ................................................................. 3-7
3-8 Control Word 6 ................................................................. 3-7
viii Digital Systems Division

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LIST OF ILLUSTRATIONS (Continued)
Figure Title Page
3-9 Control Word 7 ................................................................. 3-8
3-10 Command Format ............................................................. 3-10
3-11 Store Registers DataFormat ..................................................... 3-11
3-12 Header DataFormat ............................................................ 3-12
3-13 Format of a Sector Record Bit Stream ............................................. 3-17
4-1 Disk Drive Controls and Indicators ................................................ 4-2
4-2 Disk Designation Jumper ......................................................... 4-8
4-3 Disk Controller LEOs (pWB Version) .............................................. 4-9
4-4 Disk Controller LEOs (Fine Line PWB Version) .................................... 4-10
4-5 Disk Contaminants ............................................................. 4-13
LIST OF TABLES
Table
nde
Page
1-1 Disk Drive Specifications ........................................................ 1-10
1-2 General Characteristics of Model OSlO Cartridge Disk System ........................ 1-11
1-3 Ac Power Requirements for Disk Drive (Both 50- and 6O-Hertz Drives) ................. 1-13
2-1 Model OSlO Cartridge Disk System Components ..................................... 2-2
2-2 Site Environmental Requirements for Model OSlO Cartridge Disk System ................ 2-6
2-3 Disk Drive Input Voltage Jumper Connections ...................................... 2-26
2-4 TILINE Slave Address Switch Settings and Addresses ................................ 2-44
3-1 Disk Command Bits ............................................................. 3-5
3-2 Example of List Words in a Store Registers Command ............................... 3-11
3-3 Write Format Command ........................................................ 3-11
3-4 Example of Read Data .......................................................... 3-12
3-5 Read Unformatted Command Example ............................................ 3-14
3-6 Example of a Seek Command .................................. ~ ................. 3-15
ix
Digital Systems Division

...-
6
(A) 143663
Figure 1-1. Model OSlO Cartridge Disk System

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~ 946261-9701
SECTION 1
GENERAL DESCRIPTION
1.1 GENERAL
The Model DSI0 Cartridge Disk System (Figure 1-1) is a moving-head random-access magnetic disk
data storage system for the Model
990 Computer. The system consists of a printed wiring board disk
controller and up
to two Model DSI0 Cartridge Disk Drives as shown in Figure 1-2. A Model DSI0
Cartridge Disk System consisting of one disk controller and two disk drives is capable of storing
25.2 million unformatted bytes
of data, 12.6 million per disk drive (20 million, 10 million per disk
drive, when formatted).
The disk system features include:
•
•
•
•
•
•
•
Single printed wiring board controller capable of supporting two disk drives.
Transfer rate
of 312K bytes per second
A fixed and a removable disk
Automatic track switching across head and cylinder boundaries
Variable record formats, from one sector to full track
Efficient disk formatting and double-frequency recording for high percentage use
of
storage
Controller self-diagnostic capability
The Model DSI0 Cartridge Disk System uses a magnetic medium-density (2200 bits per inch) disk
(one fixed, one removable) and flying heads that move laterally over the disk surfaces
to select dif-
ferent cylinders. Control for up to two disk drives resides on a disk controller printed wiring board
(PWB) located in a Model 990 Computer chassis. The controller uses
an on-board microprocessor
to handle all time-critical events in the transfer of databetween the computer and the disk drive. The
disk drive assembly includes the mechanical, e1etromechanical, and electronic components required
to rotate the disks, perform track selection, and read and write data on the disk.
1.2 SYSTEM CONFIGURATION
Figure 1-2 illustrates the relationship of the major components of the Model DSI0 Cartridge Disk
System. The disk controller is a full-width PWB that is installed in the computer chassis to interface
with the computer's high-speed TILINE* data bus.
Two cables are required
to connect the controller to the primary disk drive. One cable carries con-
trol signals and serial data from the controller to the primary disk drive, and the other cable carries
status signals and serial data from the primary disk drive
to the disk controller. When a second disk
drive
is installed into a system, the disk drive is daisy-chained to the first disk drive with two addi-
tional cables. The cables that interconnect the two disk drives perform the same functions as the
*Trademark of Texas Instruments Incorporated.
1-1
Digital Systems Division

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r
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---
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MEMORY
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-
~
--
~
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A) 137221
I COM MANOS AND
SERIAL DATA .. -
PARALLEL
~ I
..
DISK
STATUS AND
CONTROLLER
SERIAL DATA
TILINE
...
I-
INTERFACE
I
PRIMARY
TILINE
DISK DRIVE
DATA
.. ~
BUS
...
I
--
-
~
I
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COMMANDS
------
AND
SERIAL DAT~_
...
STATUS AND
SERIAL DATA
-
SECONDARY
DISK DRIVE
~-
TERM I NA TOR ------"
-I-
Figure 1-2. Model OSlO Cartridge Disk Unit Subsystem Simplifred Diagram
cables that interconnect the disk controller with the first disk drive. The second disk drive functions
as though it were connected directly to a disk controller.
The cables connect to
an adapter board at each disk drive. The adapter board mates the flat
ribbon cable connectors to the Winchester connector on the disk drive.
1.2.1 TILINE
BUS. The TILINE bus is an asynchronous, high-speed, 16-bit parallel data bus
used to transfer data between the central processing unit (CPU) of the computer, the computer's
memory, and any TILINE device installed in the computer, such
as magnetic tape and disk
storage systems. Any full-sized 990 circuit board plugged into the Model 990 Computer chassis
may engage the TILINE bus and participate in data transfers. The TILINE bus
is divided
between two chassis connector slots, PI and P2, in a full-width chassis slot.
Two classes
of TILINE users interface with the TILINE bus. Users of the bus that contend for con-
trol of the bus are called TILINE masters, and users that only accept data from the bus are called
TILINE slaves. The disk controller
is both a master and a slave, depending on the operation being
conducted. The disk controller
is a slave when receiving commands from the CPU and a master
when contending for the bus to transfer data to or from the computer's memory.
Data
is transferred between the TILINE bus and the disk controller as parallel, 16-bit words. The
associated address information
is transferred as parallel, 20-bit words. In addition, a number of
control lines are used to synchronize TILINE bus transfers and to indicate data parity errors.
Figures
1-3 and 1-4 illustrate the timing relationship between the major signals on the TILINE inter-
face. The signals in Figures 1-3 and 1-4 are described as follows:
1-2
Digital Systems Division

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~ 946261-9701
AT MASTER
TLGO-
TLTM-
TLREAD
TLADR,
00-19,-
TLDAT,
00-15,-
TLMER-
AT SLAVE
TLGO-
TLTM-
TLREAD
TLADR,
00-19,-
TLDAT,
00-15,-
TLMER-
(A) 137222A
( T)
I I
I (R) I
(T)
I I
(T)
VALID
I I
I I
~
(T)
I'
VALID
I
I
I I I \ I
I , I
I I
I I I I I I
\(R) ~
~
I
S I I
I I
(T)
9'
I
I Y I
1 (R) ~
I I ,
I Y
I (R) I'
VALID
I I
I I
I (R) I'
VALID
Y I I
I
I I I I
(T) = TRANSMITTED
(R) = RECEI VED
NOTE: TILINE DELAY IS EXAGGERATED FOR CLARITY
Figure 1-3. TILINE Master-to-Slave Write Cycle Timing
I I
L-I-----
I I
1'-- -I-
IL--I--- -
I I
\
1'-- -1- ----
I
I
I
\
I~ ----
I
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\\.- ---
f'--- --
X
1\--- -
• TILINE Go (TLGO-) - a low-active, master-generated signal that alerts all slaves on the
TILINE bus that a master
is ready to initiate a data transfer. TLGO- directs all slaves to
monitor the TILINE address (TLADR, 00-19) and respond when addressed. The master
that generated TLGO- holds
TLGO- low until the addressed slave responds with TILINE
Terminate (TLTM-) or until the master times out.
• TILINE Read (TLREAD) - a high-active, master-generated signal that directs the ad-
dressed slave to fetch data from the addressed memory location and make the data
available to the master that generated TLREAD.
If TLREAD is low, the addressed slave
is directed to store in the slave's addressed memory location the data that the master has
made available on the interface.
1-3
Digital Systems Division

AT MASTER
TLGO-
TLTM-
TLREAD
TLADR
TLDAT-
TLMER-
AT SLAVE
-
TLGO-
I
.J:>..
TLTM-
TLREAD
TLADR-
TLDAT-
TLMER-
0
cO'
::;:
Q)
-
(I)
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CD
3
en
(A) 137223A
0
~.
~.
O·
:::s
(T)
(T)
(T)
VALID
~R)
1 I I
I I
I ,'-J ___ _
I I I
--------------------------------------------(-R-)~~~ _________ VA_L_I_D~--~Vr---- ----------
I I
(R)
I I
I I
I I
I(R) VALID
1 1
(T)
(T) = TRANSMI TTED
(R) :: RECEI VED
K 1 ERROR I;
'- _________ ...:1
I
1
I
I
I
VALID
ERROR ,
- - - - -1--
NOTE: TILINE DELAY IS EXAGGERATED FOR CLARITY
Figure 1-4. TILINE Master-to-Slave Read Cycle Timing
1'----
1'----

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~ 946261-9701
•
•
•
TILINE Terminate (TLTM-) - a low-active, slave-generated signal that informs the
master that generated
TLGO- that the slave has accepted the master's data during a
memory write or that the slave's memory data
is valid on the interface as TILINE Data
(TLDAT, 00-15). The slave that generated
TLTM- holds TLTM- low until the master
removes
TLGO-.
TILINE Address (TLADR, 00-19-) - 20 low-active, master-generated signals that ad-
dress the slave memory location to be accessed for the read or write operation.
TILLVE Data (TLDAT, 00-15-) - 16 low-active master- or slave-generated signals that
provide two-way data transfer over the TILINE interface.
TILINE Memory Error (TLMER-) - a low-active, slave-generated signal that informs
the master that the active slave detected a parity error when data was fetched from the
slave's memory. The slave performs no parity check on data fetched from its registers.
1.2.2 DISK CONTROLLER. The disk controller
is a microprocessor-based controller with a set of
control ROMs (read only memories) implemented on a full-sized Model 990 PWB. The disk con-
troller can be installed into any standard TILINE chassis slot. The controller slave address
is set by
switches located on the controller PWB
as described in Section 2. The disk controller supports up to
two disk drives connected
as shown in Figure 1-5.
All disk controller operations are initiated by instructions (commands) from the computer. These in-
structions are directed to the slave address assigned to the controller.
After a disk controller command has been initiated by the computer, the computer cannot read or
write to the slave address
of the designated controller until the command is completed. When the
controller
is busy and a slave request is initiated, the request is terminated normally and the idle bit
is forced to zero.
After initiation
of a command by the computer, the disk controller may become a TILINE master.
The controller contends for TILINE access on a positional priority basis by cycle-stealing with the
CPU and with any other TILINE master devices that are active. After gaining access to the TILINE
bus, the disk controller transfers 16-bit parallel data words to and from the slave it has addressed (in
most cases, a computer memory module). The disk controller
is autonomous (not dependent on any
CPU action after it has been activated).
Figure
1-6 shows the disk controller (PWB) and Figure 1-7 shows the disk controller (fine line
PWB).
1.2.3 DISK DRIVES. The Model DSIO Cartridge Disk Drive (Figures 1-1 and 1-2) is a voice coil-
actuated disk drive with four moving heads (two each for a fixed and a cartridge disk). The disk
drive assembly contains the read/write heads, voice coil, analog and digital circuit boards, power
supply, power amplifier, cartridge receiver, spindle and drive motor, one fixed disk, filter, air
blower and cooling system.
The disk drive operates at 2400 revolutions per minute (rpm) and has an unformatted storage
capacity
of 100 million bits of data. Each drive contains one fixed disk and accepts a removable car-
tridge to double its storage capacity. The disk drive
is available for slide mounting in a standard
482.60-millimeter (19.00-inch) rack with 266.70 millimeters (10.50 inches)
of panel space (Figure
1-1) or mounted in its own standalone cabinet (Figure 1-8). Table 1-1 lists the performance
characteristics
of the disk drive.
1-5
Digital Systems Division

~~------------------
~ 946261-9701
50-WIRE CABLE
937516-0001 - CABINET MOUNT
937516-0003 - RACK MOUNT
40-WIRE CABLE
937515-0001 - CABINET MOUNT
937515-0003 - RACK MOUNT
~--~---~{--------~
6.1 M
(20 FT) CABLE
(CABINET MOUNT)
3.05 M
(10FT) CABLE
(RACK MOUNT)
CABLE
ADAPTER
,.83 M
(6 FT)
DAISY
CHAIN
CABLES
(A)142127A
CABLE
ADAPTER
937510-0001
P3
P4
DISK CONTROLLER ASSEMBLY
(COMPONENT SIDE)
PI
937505-0001
2262100-0001
P2
NOTES: 1. WHEN ONLY ONE DISK DRIVE IS USED
THE TERMINATING RESISTORS ARE
LOCATED ON THE PRIMARY DISK
DRIVE.
2. STANDARD CONFIGURATION.
PRIMARY DISK DRIVE
(LOGICAL UNIT O-FIXED
LOGICAL UNIT 1-REMOVABLE)2
937513-0001 (RACK MOUNT)
937513-0005 (CABINET MOUNT)
SECONDARY DISK DRIVE
(LOGICAL UNIT 2-FIXED
LOGI CAL UNI T 3-REMOVABLE)2
TERMINATING RESISTORS
1
Figure 1-5. Interconnection of Disk Controller and Two Disk Drives
1.3 SYSTEM OPERATION
The Model DS10 Cartridge Disk System provides an auxiliary mass storage facility for the
Model990 Computer system. The disk system performs disk-to-memory transfers between
TILINE memory and disk memory. The data transfer, whether read or write, is initiated by
software executing in the computer's central processing unit (CPU) and controlled by firmware
executing in the microprocessor of the disk controller after receipt of a command from the
computer.
The computer addresses the disk system via the disk controller's slave address. The disk controller
then functions as a TILINE master and relieves the computer
of direct responsibility for the data
transfer. The disk controller fetches parallel data from TILINE memory (write) or transfers serial
data from disk (read); converts the data to serial or parallel, depending upon the direction of the
data transfer; and completes the transfer. The disk operates under complete control of the disk con-
troller.
1-6
Digital Systems Division

SLAVE ADDRESS
SWITCHES
(A)137249A
STATUS LEOS
Figure 1-6. Model DSI0 Cartridge Disk Controller (PWB)

~
I
QO
(A) 143664
SLAVE ADDRESS
SWITCHES
Figure 1-7. Model DSI0 Cartridge Disk Controller (Fine Line PWB)

Jd7)\ ______ _
"'ij/ 946261-9701
(A) 143665
Figure 1-8. Model OSlO Cartridge Disk Drive (Cabinet Mount)
1-9
Digital Systems Division

~-------
~ 946261-9701
Table I-I. Disk Drive Specifications
Item Specification
Spindle speed 2400 rpm with
±2% speed variation with input
frequency ±0.5 hertz and input voltage +10% -
15%
Tracks per surface
Tracks per drive
Tracks per cylinder*
Sectors per drive
Sectors per track
Heads per cylinder*
Heads per drive
Recording surfaces per drive
Recording mode
Track density
Recording density
Bi ts per disk drive
Bits per cylinder
Bits per track
Bits per sector
Capacity (unformatted)
Words per sector
Format overhead
Bit rate
Average access time
Average latency time
Track-to-track access time
Maximum access time
408, numbered 0 through 407
1,632
2 on each of two disks
32,640
20
2
4
4
Double frequency
200 tracks per inch
i 524 bits per inch (outer track)
2200 bits per inch (inner track)
50,000,000 nominal
250,000 nominal
62,500 nominal
3,125
12.6 megabytes
144
48 words
2.5 megahertz
35 milliseconds
12.5 milliseconds
7 milliseconds
60 milliseconds
NOTE: *A cylinder of storage consists of 2 tracks on either
the removable cartridge
or the fixed disk. The cartridge and
the fixed disk are separate logical units, although they share a
common spindle and a common head carriage; therefore, a
cylinder does not cross disk boundaries.
In a system with one disk controller and two disk drives, the disk controller functions as though only
one disk drive with more storage space were attached. All operations for different disk drives are
identical except for the unit select signal used to identify the drive being addressed.
1.4 SYSTEM SPECIFICATIONS
Table
1-2 lists the physical and electrical characteristics for the disk system.
1-10
Digital Systems Division