Digital Equipment Rainbow 100 User manual

Rainbow™
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EK-PC100-TM-001
RainbowTM
100
Technical Manual
digital equipment corporation

First Edition, May 1984
© Digital Equipment Corporation 1984. All Rights Reserved.
Printed in U.S.A.
The information in this document is subject to change without notice and should not be construed as a
commitment
by Digital Equipment Corporation. Digital Equipment Corporation assumes no responsibility
for any errors that may appear
in this document.
WARNING: The Rainbow 100 computer has been certified
to comply with the limits for a Class B
computing device, pursuant
to Subpart J of Part 15 of FCC Rules. Only peripherals (computer
input/output devices, terminals, printers, etc.) certified to comply with the Class B limits may be attached
to this computer. Operation with noncertified peripherals
is likely to result in interference to radio and
television reception.
This equipment generates and uses radio frequency energy and if not installed and used properly, that
is, in
strict accordance with the manufacturer's instructions, may cause interference to radio and television
reception.
It has been type tested and found to comply with the limits for a Class B computing device in
accordance with the specifications in Subpart J of Part 15 of FCC Rules, which are designed to provide
reasonable protection against such interference
in a residential installation. However, there is no guarantee
that interference
will not occur in a particular installation. If this equipment does cause interference to
radio or television reception, which can be determined
by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
• Reorient the receiving antenna.
• Move the computer away from the receiver.
• Plug the computer into a different outlet so that computer and receiver are on different
branch circuits.
If necessary, the user should consult the dealer or an experienced radio/television technician for additional
suggestions. The user may find the following booklet prepared by the Federal Communications Commis-
sion helpful:
How to Identify and Resolve Radio-TV Interference Problems
This booklet is available from the US Government Printing Office, Washington, DC 20402, Stock No.
004-000-00345-4.
CP/M®, CP/M®-80, CP/M-86®, and CP/M®-86/80 are registered trademarks of Digital Research Inc.
8088™
is a trademark of Intel Corporation.
MSTM-DOS is a registered trademark of Microsoft Corporation.
Myiar™
is a trademark of Dupont de Nemours & Company, Inc.
Qikeject™
is a trademark of Burndy, Inc.
Z80® is a registered trademark of Zilog, Inc.
The manuscript for this book
was created using a DIGITAL Word Processing System and, via a
translation program,
was automatically typeset on DIGITAL's DECset Integrated Publishing System.
Book production
was done by Educational Services Development and Publishing in Marlboro and Bedford,
MA.
The following are trademarks of Digital Equipment Corporation:
mamaoma
DIBOL RSX
DEC MASSBUS UNIBUS
DECmate PDP VAX
DECsystem-IO
P/OS
VMS
DECSYSTEM-20 Professional VT
DECUS Rainbow Work Processor
DECwriter RSTS

PREFACE
CHAPTER 1
1.1
1.2
1.2.1
1.2.2
1.2.2.1
1.2.2.2
1.2.3
1.2.3.1
1.2.3.2
1.3
1.4
1.4.1
1.4.2
1.4.3
1.4.4
l.4.S
CHAPTER 2
2.1
2.2
2.3
2.4
2.4.1
2.4.2
2.4.2.1
2.4.2.2
2.4.3
2.4.3.1
2.4.3.2
2.4.3.3
2.4.3.4
2.4.3.S
2.4.3.6
2.4.3.7
2.4.3.8
2.4.3.9
2.4.3.10
2.4.3.11
2.4.3.12
CONTENTS
Page
INTRODUCTION
GENERAL DESCRIPTION..................................................................................... 1-1
PHYSICAL DESCRIPTION .................................................................................... 1-3
Video Monitor .................................................................................................... 1-3
The Keyboard..................................................................................................... 1-4
Keyboard Features..................................................................................... 1-4
Keyboard LEDs ......................................................................................... I-S
The System Unit ................................................................................................ l-S
The System Module................................................................................... 1-6
The RXSO Dual-Diskette Drive................................................................. 1-7
FEATURES AND CAPABILITIES......................................................................... 1-7
RAINBOW 100 COMPUTER SPECIFICATIONS................................................ 1-8
System Specifications......................................................................................... 1-8
Video Monitor Specifications............................................................................. 1-9
Keyboard Specifications..................................................................................... 1-9
System Unit and Power Supply Specifications................................................ 1-10
RXSO Dual-Diskette Drive Specifications ....................................................... 1-11
OPERATING INFORMATION
INTRODUCTION.....................................................................................................
2-1
USING DISKETTES................................................................................................. 2-1
POWERING UP THE RAINBOW 100 COMPUTER .......................................... 2-1
SETTING UP THE COMPUTER........................................................................... 2-3
Help .................................................................................................................... 2-4
Tabs Major Heading .......................................................................................... 2-4
Tab Stops .............................................................'...................................... 2-S
Local and Line Modes ............................................................................... 2-S
Parameter Settings Major Heading ................................................................... 2-S
Scroll .......................................................................................................... 2-9
Correspondence/Data Processing Keyboard ............................................. 2-9
Screen Width ............................................................................................. 2-9
Cursor......................................................................................................... 2-9
Emulation................................................................................................... 2-9
Auto-Repeat............................................................................................... 2-9
Screen......................................................................................................... 2-9
Margin Bell ................................................................................................ 2-9
Keyclick ..................................................................................................... 2-9
Auto-Wrap............................................................................................... 2-10
New Line Mode....................................................................................... 2-10
Default Character Set.............................................................................. 2-10
III

2.4.3.13
2.4.3.14
2.4.3.15
2.4.3.16
2.4.3.17
2.4.3.18
2.4.3.19
2.4.3.20
2.4.3.21
2.4.3.22
2.4.3.23
2.4.3.24
2.4.3.25
2.4.4
2.4.4.1
2.4.4.2
2.4.4.3
2.4.4.4
2.4.5
2.4.5.1
2.4.5.2
2.4.6
2.4.6.1
2.4.6.2
2.4.6.3
2.4.7
2.4.8
2.4.9
2.4.10
2.4.11
2.5
2.6
2.6.1
2.6.1.1
2.6.1.2
2.6.2
2.6.3
2.6.3.1
2.6.3.2
2.6.3.3
2.6.4
2.6.5
2.6.6
2.7
CONTENTS (Cont)
Page
Auto-Screen Blank................................................................................... 2-10
Power .......................................................................................................
2-11
Print Termination Character ................................................................... 2-11
Print Extent ............................................................................................. 2-11
Auto-XON/XOFF ................................................................................... 2-11
Local Echo ............................................................................................... 2-11
Transmit Break ........................................................................................ 2-11
Modem Stop Bits ..................................................................................... 2-11
Received Character Parity....................................................................... 2-11
Auto-Answerback..................................................................................... 2-11
Disconnect Character Use ....................................................................... 2-12
Disconnect Delay ..................................................................................... 2-12
How to Store an Answerback Message................................................... 2-12
Modem Major Heading.................................................................................... 2-13
Changing Modem Data Bits and Parity.................................................. 2-14
Setting the Transmit Baud Rate ............................................................. 2-14
Setting the Receive Baud Rate ............................................................... 2-14
Setting Modem Protocol.......................................................................... 2-14
Printer Major Heading..................................................................................... 2-15
Setting Printer Data Bits and Parity....................................................... 2-16
Setting Printer Transmit/Receive Baud Rate......................................... 2-16
Misc Major Heading ........................................................................................ 2-16
Scroll Rate ............................................................................................... 2-16
Bell Volume.............................................................................................. 2-16
Click Volume ........................................................................................... 2-16
Memory Major Heading .................................................................................. 2-17
Save Set-Up Values.......................................................................................... 2-18
Recall Set-Up Values ....................................................................................... 2-18
Default Set-Up Values ..................................................................................... 2-18
Execute System Reset...................................................................................... 2-18
USING THE COMPUTER'S OPERATING SYSTEM....................................... 2-19
USING A HOST COMPUTER OPERATING SYSTEM ................................... 2-19
Connecting the Rainbow 100 Computer to a Host Computer ....................... 2-20
Cables....................................................................................................... 2-20
Connection ............................................................................................... 2-20
Communications Set-Up Parameters............................................................... 2-23
Modem Protocol............................................................................................... 2-23
Full-Duplex With No Modem Control (FDXA).....................................
2-24
Full-Duplex With Modem Control (FDXB)............................................ 2-24
Asymmetrical Full-Duplex (FDXC) ........................................................ 2-25
Break ................................................................................................................ 2-25
Auto-XON/XOFF ........................................................................................... 2-25
Communications Connector Signals................................................................. 2-25
USING RAINBOW 100 COMPUTER DIAGNOSTICS ..................................... 2-28
IV

CHAPTER 3
3.1
3.2
3.2.1
3.2.2
3.3.3
3.3
3.3.1
3.3.1.1
3.3.1.2
3.3.1.3
3.3.1.4
3.3.1.5
3.3.1.6
3.3.1.7
3.3.1.8
3.3.1.9
3.3.1.10
3.3.1.11
3.3.1.12
3.3.1.13
3.3.1.14
3.3.1.15
3.3.1.16
3.3.1.17
3.3.2
3.3.3
3.4
3.4.1
3.4.2
3.4.3
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
3.6
3.6.1
3.6.2
CONTENTS (Cont)
Page
SYSTEM TECHNICAL DESCRIPTION
INTRODUCTION ..................................................................................................... 3-1
BASIC SYSTEM COMPONENTS .......................................................................... 3-1
System Unit........................................................................................................ 3-1
Video Monitor (VR201)..................................................................................... 3-3
Keyboard (LK20
1) ............................................................................................. 3- 3
SYSTEM FUNCTIONAL DESCRIPTION ............................................................ 3-3
System Module................................................................................................... 3-5
8088 Processor........................................................................................... 3-5
8088 Memory ............................................................................................ 3-6
Shared Memory ......................................................................................... 3-6
24K Byte
ROM ......................................................................................... 3-6
NVM .......................................................................................................... 3-6
4K Byte Screen RAM and 4K Byte Attribute RAM .............................. 3-6
Video Processor.......................................................................................... 3-7
Keyboard Interface.................................................................................... 3-7
Communications and Printer Interface ..................................................... 3-8
Z80A Processor ....................................................................................... 3-10
Z80A Shared Memory ............................................................................ 3-10
Z80A 2K Byte RAM .............................................................................. 3-10
Interrupt Logic......................................................................................... 3-10
Communications Baud Rate Generator................................................... 3-11
Printer Baud Rate Generator .................................................................. 3-11
PC 100 Clock Circuit ............................................................................... 3-12
RX50 Controller...................................................................................... 3-12
RX50 Diskette Drive Unit............................................................................... 3-12
Power Supply ................................................................................................... 3-13
OPTION MODULES .............................................................................................. 3-14
Memory Extension Option............................................................................... 3-14
Extended Communications Option .................................................................. 3-14
Graphics Option ............................................................................................... 3-16
SYSTEM INTERFACE CONNECTORS ............................................................. 3-16
Communications Connector (11) Signals ......................................................... 3-17
Printer Connector (12) Signals......................................................................... 3-21
Keyboard/Monitor Connector (13) Signals ..................................................... 3-22
Extended Communications Connectors (J4 and J5)........................................ 3-23
Memory Extension Connector (J6) Signals ..................................................... 3-25
Graphics Connector
(n) Signals...................................................................... 3-28
Power Supply Connector (J8) Signals.............................................................. 3-30
RX50 Controller Connector (19) Signals......................................................... 3-30
FIRMWARE INTRODUCTION ........................................................................... 3-33
Terminal Mode................................................................................................. 3-34
ROM Selftest Diagnostics................................................................................ 3-35
v

CHAPTER 4
4.l
4.1.1
4.1.2
4.2
4.3
4.4
4.4.1
4.4.1.1
4.4.1.2
4.4.1.3
4.4.1.4
4.4.1.5
4.4.1.6
4.4.1.7
4.4.1.8
4.4.1.9
4.4.2
4.4.2.1
4.4.2.2
4.4.2.3
4.4.2.4
4.4.3
4.4.3.1
4.4.3.2
4.4.3.3
4.4.4
4.4.4.1
4.4.4.2
4.4.5
4.4.5.1
4.4.5.2
4.4.5.3
4.4.5.4
4.4.5.5
4.4.6
4.4.6.1
4.4.6.2
4.4.7
4.4.7.1
4.4.7.2
4.4.7.3
4.4.8
4.4.8.1
4.4.8.2
4.4.8.3
4.4.8.4
4.4.8.5
4.4.8.6
CONTENTS (Cont)
Page
SYSTEM MODULE TECHNICAL DESCRIPTION
INTRODUCTION ..................................................................................................... 4-1
Chapter Organization ......................................................................................... 4-1
Related Documentation...................................................................................... 4-1
GENERAL DESCRIPTION..................................................................................... 4-1
PHYSICAL DESCRIPTION .................................................................................... 4-3
SYSTEM MODULE FUNCTIONAL DESCRIPTION.......................................... 4-3
System Module Address and Data Buses .......................................................... 4-4
8088 Address and Data Buses................................................................... 4-4
Z80A Address and Data Buses ................................................. '" ............. 4-6
Buffered Output Data Bus.....................:................................................... 4-6
Video Processor Shared Address
Bus ........................................................ 4-6
Video Processor Buffered Address
Bus ..................................................... 4-6
Video Processor Attribute Bus .................................................................. 4-6
Video Processor Buffered Data
Bus .......................................................... 4-6
Shared Memory Address Bus .................................................................... 4-7
Shared Data Bus ........................................................................................ 4-7
Clock Circuit......................................................................................................
4-7
Master Clock.............................................................................................. 4-8
8088 Clock Logic ...................................................................................... 4-8
Z80A Clock Logic..................................................................................... 4-8
RX50 Controller Clock Logic ................................................................... 4-9
8088 Processor ................................................................................................... 4-9
8088 Architecture.................................................................................... 4-10
Bus Operation .......................................................................................... 4-11
8088 Pin Description ............................................................................... 4-12
Z80A Processor................................................................................................ 4-16
Z80A Basic Timing ................................................................................. 4-16
Z80A Pin Description ............................................................................ 4-18
System Module Memory.................................................................................. 4- 21
64K Byte Shared Memory ...................................................................... 4-22
24K Byte
ROM ....................................................................................... 4-24
256 X 4 Bit
NVM ................................................................................... 4-24
2K Byte Z80A Dedicated
RAM (Static)................................................ 4-26
4K Byte Screen
RAM and 4K Byte Attribute RAM (Static) ............... 4-27
I/O Decoders.................................................................................................... 4-29
8088 I/O Decoders.................................................................................. 4-29
Z80A I/O Decoders ................................................................................ 4-31
Interrupt Logic ................................................................................................. 4-33
8088 Interrupts ........................................................................................ 4-33
Z80A Interrupts....................................................................................... 4-35
Z80A/8088 Interprocessor Interrupts..................................................... 4-35
Video Processor ..........................................•..................................................... 4-36
8088 Processor-Video Processor Interface .............................................. 4-38
Screen RAM and Attribute RAM .......................................................... 4-38
DC
11 Timing Chip.................................................................................. 4-40
DC12 Control Chip ................................................................................. 4-40
Video Processor Memory Addressing...................................................... 4-41
DC11 Programming Information ............................................................ 4-42
VI

4.4.8.7
4.4.8.8
4.4.8.9
4.4.8.10
4.4.8.11
4.4.8.12
4.4.8.13
4.4.8.14
4.4.9
4.4.9.1
4.4.9.2
4.4.9.3
4.4.9.4
4.4.10
4.4.10.1
4.4.10.2
4.4.10.3
4.4.10.4
4.4.l1
4.4.12
4.4.12.l
4.4.12.2
4.4.12.3
4.4.13
4.4.14
4.4.14.1
4.4.14.2
4.4.14.3
4.4.14.4
4.4.15
4.5
4.6
4.6.1
4.6.2
4.6.3
4.6.3.1
4.6.3.2
4.6.3.3
CHAPTER 5
5.1
5.1.1
5.1.2
5.2
5.3
5.4
5.4.1
5.4.1.1
5.4.1.2
CONTENTS (Cont)
Page
DC12 Programming Information ............................................................ 4-43
Line Buffer
RAM .................................................................................... 4-45
Line Address Counter.............................................................................. 4-45
Termination Detector............................................................................... 4-46
Character Generator
ROM ...................................................................... 4-46
Video Shift Register ................................................................................ 4-47
Video Generator....................................................................................... 4-48
Composite Video Signal Characteristics.................................................. 4-48
8088 Diagnostic and Control/Status Registers ............................................... 4-49
Diagnostic Write Register: 8088 Processor............................................. 4-49
Diagnostic Read Register: 8088 Processor.............................................. 4-49
Communications Status Register: 8088 Processor .................................. 4-49
Communications Control Register: 8088 Processor................................ 4-49
Z80A Registers ................................................................................................ 4-58
General/Diagnostic Status Register: Z80A Processor ............................ 4-58
General/Diagnostic Control Register: Z80A Processor.......................... 4-59
Diskette Drive Status Register: Z80A Processor .................................... 4-60
Diskette Drive Control Register: Z80A Processor.................................. 4-61
MPSC General Description.............................................................................. 4-63
MPSC Communications Channel .................................................................... 4-70
Asynchronous Operation.......................................................................... 4-71
Synchronous Operation (Monosync, Bisync) ........................................... 4-72
Synchronous Operation (HDLC/SDLC) ................................................. 4-73
MPSC Printer Channel .................................................................................... 4-74
Keyboard Interface .......................................................................................... 4-75
8251 A
PUSART General Description .................................................... 4-75
Control Register: 8251 A ......................................................................... 4-78
Status Register: 8251A............................................................................
4-81
Transmit and Receive Data Registers: 8251 A........................................ 4-82
MHFU Detection Logic ................................................................................... 4-82
SYSTEM MODULE
CONNECTORS ................................................................... 4-83
SYSTEM MODULE SPECIFICATIONS.............................................................. 4-84
Physical Dimensions ......................................................................................... 4-84
DC Power......................................................................................................... 4-84
Environmental .................................................................................................. 4-84
Temperature............................................................................................. 4-84
Relative Humidity.................................................................................... 4-84
Altitude .................................................................................................... 4-84
RX50 CONTROLLER MODULE
INTRODUCTION ..................................................................................................... 5-1
Chapter Organization......................................................................................... 5-1
Related Documentation...................................................................................... 5-1
GENERAL DESCRIPTION..................................................................................... 5-1
PHYSICAL DESCRIPTION .................................................................................... 5-2
FUNCTIONAL DESCRIPTION.............................................................................. 5-3
Diskette Drive Formatter/Controller................................................................. 5-3
Processor Interface..................................................................................... 5-4
Diskette Drive Interface ............................................................................ 5-5
vii

5.4.1.3
5.4.1.4
5.4.1.5
5.4.1.6
5.4.1.7
5.4.1.8
5.4.1.9
5.4.1.10
5.4.1.11
5.4.1.12
5.4.1.13
5.4.2
5.4.3
5.4.4
5.4.4.1
5.4.4.2
5.4.5
5.4.6
5.4.7
5.5
5.6
5.6.1
5.6.2
5.6.3
CHAPTER 6
6.1
6.1.1
6.1.2
6.1.3
6.1.4
6.1.5
6.1.5.1
6.1.5.2
6.1.5.3
6.1.6
6.2
6.2.1
6.2.2
6.2.3
6.2.4
6.2.5
6.2.6
6.2.7
6.3
6.3.1
6.3.1.1
6.3.1.2
6.3.1.3
CONTENTS (Cont)
Page
FDC Control Register (Write Only) Address 60H................................... 5-6
FDC Status Register (Read Only) Address 60H .................................... 5-10
FDC Track Register (Read/Write) Address 61H .................................. 5-13
FDC Sector Register (Read/Write) Address 62H.................................. 5-13
FDC Data Register (Read/Write) Address 63H .................................... 5-13
Formatter/Controller Register Delays..................................................... 5-14
Data Shift Register.................................................................................. 5-14
CRC Logic............................................................................................... 5-14
Arithmetic Logic Unit (ALU)........;........................................................ 5-14
AM Detector............................................................................................ 5-14
Formatter/Controller Pin Descriptions.................................................... 5-14
Data Separator ................................................................................................. 5-18
Write Precompensation .................................................................................... 5-19
Diskette Drive Select Logic .............................................................................
5-21
Diskette Drive Ready Status ................................................................... 5-23
Diskette Drive Select Light Operation .................................................... 5-23
Diskette Status Register (Read Only) Address 40H....................................... 5-23
Diskette Control Register (Write Only) Address 40H .................................... 5-24
General/Diagnostic Status Register (Read Only) Address 21H ..................... 5-26
RX50 CONTROLLER MODULE CONNECTORS ............................................ 5-28
SPECIFICATIONS.................................................................................................. 5-33
Physical Dimensions ......................................................................................... 5-33
DC Power......................................................................................................... 5-33
Environmental .................................................................................................. 5-33
RX50 DISKETTE DRIVE
INTRODUCTION..................................................................................................... 6-1
Related Documentation...................................................................................... 6-1
General Information........................................................................................... 6-1
Physical Description ........................................................................................... 6-1
Diskette Description ........................................................................................... 6-3
Operating Procedures......................................................................................... 6-4
Diskette Handling and Storage.................................................................. 6-4
Write Protection of Diskettes.................................................................... 6-4
Diskette Loading/Unloading......................................................................
6-5
Configuration Options ........................................................................................ 6-5
FUNCTIONAL COMPONENTS ............................................................................ 6-7
Seek and Interface Module Functions ............................................................... 6-8
Motor Control Module and Spindle Motor Function........................................ 6-9
Head Load Solenoid Function............................................................................
6-9
Sensor Functions.......................... '" ........................................., .. ,....................... 6-9
Stepper Motor Function..................................................................................... 6-9
Read/Write Module Function ...........................................................................
6-9
RX50 Drive Set-up Sequence............................................................................ 6-9
THEORY OF OPERATION .................................................................................. 6-10
Drive Mechanism Detailed Operation.............................................................. 6-10
Diskette Positioning Mechanism.............................................................. 6-11
Spindle Drive Mechanism........................................................................ 6-12
Head Positioning Mechanism .................................................................. 6-12
viii

6.3.1.4
6.3.1.5
6.3.2
6.3.2.1
6.3.2.2
6.3.2.3
6.3.3
6.3.3.1
6.3.3.2
6.3.3.3
6.3.3.4
6.3.4
6.3.5
6.3.5.1
6.3.5.2
6.3.5.3
6.3.5.4
6.3.6
6.3.6.1
6.3.6.2
6.3.7
6.3.7.1
6.3.7.2
6.3.7.3
6.3.8
6.3.8.1
6.3.8.2
6.3.8.3
6.3.9
6.3.9.1
6.3.9.2
6.3.9.3
6.3.9.4
6.3.9.5
6.3.9.6
6.3.10
6.3.10.1
6.3.10.2
6.3.11
6.4
6.4.1
6.4.1.1
6.4.1.2
6.4.1.3
6.4.1.4
6.4.1.5
6.4.1.6
6.4.1.7
6.4.1.8
6.4.1.9
CONTENTS (Cont)
Page
Head Load Mechanism............................................................................ 6-12
Sensors...................................................................................................... 6-13
Select Circuit Detailed Operation.................................................................... 6-13
Drive Select Circuit Detail ...................................................................... 6-14
Motor Enable Circuit Detail.................................................................... 6-15
Head Load Circuit Detail ........................................................................ 6-15
Motor Control Circuit Detail ........................................................................... 6-15
Frequency to Voltage Converter DetaiL ................................................ 6-16
Summer Detail......................................................................................... 6-16
Integrator Detail....................................................................................... 6-16
Gain Amplifier and Current Limiter....................................................... 6-16
Head Load Solenoids and LEDs...................................................................... 6-18
Status Circuit Detail ........................................................................................ 6-18
Write-Protect Status Circuit Detail......................................................... 6-19
Diskette Present Status Circuit Detail .................................................... 6-19
Output Driver DetaiL.............................................................................. 6-20
+5 Volt Monitor ...................................................................................... 6-20
Status Sensor Detail ......................................................................................... 6-20
Index Sensor Detail.................................................................................. 6-21
Diskette Present and Write-Protect Sensor Detail.................................. 6-21
Stepper Motor Circuit Detail........................................................................... 6-21
Stepper Motor Driver Detail ................................................................... 6-22
Track Zero Sensor Detail ........................................................................ 6-23
Track Zero Status Circuit Detail ............................................................ 6-23
Read/Write Interface Circuit Detail ............................................................... 6-23
Write Driver Circuit................................................................................ 6-25
Erase Gate Timer Detail ......................................................................... 6-25
Output Driver DetaiL............................................................................... 6-25
Write Circuit Detailed Operation .................................................................... 6-25
Write Current Generator Detail .............................................................. 6-26
Voltage Reference Detail......................................................................... 6-26
+
12 Volt Gate Detail............................................................................... 6-26
. Differential Write Switch Detail ............................................................. 6-26
Erase Gate Generator Detail ................................................................... 6-27
Multiplexer Detail.................................................................................... 6-27
Read Circuit Detailed Operation ..................................................................... 6-28
Read Amplifier Detail ............................................................................. 6-28
Multiplexer Detail .................................................................................... 6-28
Write/Read Head Detailed Operation............................................................. 6-28
INTERMODULE SIGNAL DEFINITIONS......................................................... 6-30
Seek andInterface/Controller Module Connector JI ..................................... 6-30
TKG43 L Input Signal ............................................................................ 6-31
DRIVE SEL 0 through DRIVE SEL 3 Input Signals............................ 6-31
TRACK 0 L Output Signal .................................................................... 6-32
MOTOR ON L Input SignaL................................................................. 6-32
DIRECTION Input Signal ...................................................................... 6-32
STEP L Input Signal ............................................................................... 6-32
WRITE DATA L Input Signal............................................................... 6-32
WRITE GATE L Input Signal ............................................................... 6-32
INDEX L Output Signal......................................................................... 6-32
ix