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

6.4.1.10
6.4.1.11
6.4.1.12
6.4.2
6.4.2.1
6.4.2.2
6.4.2.3
6.4.3
6.4.3.1
6.4.3.2
6.4.3.3
6.4.3.4
6.4.3.5
6.4.3.6
6.4.3.7
6.4.4
6.4.5
6.4.5.1
6.4.5.2
6.4.5.3
6.4.5.4
6.4.5.5
6.4.5.6
6.4.5.7
6.4.6
6.4.6.1
6.4.6.2
6.4.7
6.4.7.1
6.4.7.2
6.5
6.5.1
6.5.2
6.5.3
6.5.4
6.5.5
6.5.6
CHAPTER 7
7.1
7.2
7.3
7.4
7.4.1
7.4.2
7.4.2.1
7.4.2.2
7.4.2.3
7.4.2.4
CONTENTS (Cont)
Page
WRITE-PROTECT L Output Signal ..................................................... 6-32
READ DATA L Output SignaL ............................................................ 6-32
READY Output Signal ........................................................................... 6-32
Seek and Interface/Motor Control Modules Connector J4 ............................ 6-32
MPWR H Input Signal ........................................................................... 6-33
SIDE A L Input Signal ........................................................................... 6-33
SIDE B L Input Signal............................................................................ 6-33
Seek and Interface, Read/Write Modules Connector J9................................ 6-33
DCOK L Output Signal .......................................................................... 6-33
±WRITE L Output Signal ...................................................................... 6-33
R DATA H Input Signal......................................................................... 6-33
W
GATE L Output Signal...................................................................... 6-33
WRITE CURRENT SWITCH Output SignaL .................................... 6-33
ERASE GATE L Output Signal ............................................................ 6-34
SEL A L Output Signal .......................................................................... 6-34
Seek and Interface Power Connector 13 ......................................................... 6-34
Seek and Interface Connectors J2, J 5, J6, 17, J8, J10, and 117.................... 6-34
Side A Switches and Indicators Connector 12........................................ 6-34
Track 0 Sensor Connector J5.................................................................. 6-34
Side B Head Load Solenoid Connector J6 .............................................. 6-34
Stepper Motor Connector J7 ................................................................... 6-35
Side B Switches and Indicators Connector J8......................................... 6-35
Side A Head Load Solenoid Connector JI0 ........................................... 6-35
Drive Select Jumper J17 ......................................................................... 6-35
Motor Control Modules Connectors J4, 111, 116 ........................................... 6-35
Spindle Motor Connector
Jl1 ................................................................. 6-36
Front Panel Operational Indicators Connector 116................................. 6-36
Read/Write Module Connectors J9, J14, J15 ................................................ 6-36
Side A Read, Write, and Erase Head Connector JI4 ............................ 6-36
Side B Read, Write, and Erase Head Connector JI5 ............................. 6-37
SPECIFICATIONS .................................................................................................. 6-37
Performance Specifications.............................................................................. 6-37
Reliability Specifications.................................................................................. 6-37
Functional Specifications.................................................................................. 6-38
Electrical Specifications ................................................................................... 6-38
Environmental Specifications........................................................................... 6-38
Mechanical Specifications ................................................................................ 6-38
POWER SUPPLY AND FAN
INTRODUCTION ..................................................................................................... 7-1
PHYSICAL DESCRIPTION .................................................................................... 7-2
FUNCTIONAL DESCRIPTION .............................................................................. 7-5
DETAILED CIRCUIT DESCRIPTION .................................................................. 7-6
Power Conversion Circuits................................................................................. 7-6
Control and Sensing Circuits ............................................................................. 7-6
AC OK ....................................................................................................... 7-6
Lockout Drive ............................................................................................ 7-6
Crowbar Fire.............................................................................................. 7-7
Antisaturation ............................................................................................ 7-7
x

7.4.2.5
7.5
7.5.1
7.5.1.1
7.5.1.2
7.5.2
7.5.2.1
7.5.2.2
CHAPTER 8
8.1
8.2
8.3
8.3.1
8.3.2
8.3.3
8.3.3.1
8.3.3.2
8.3.3.3
8.4
8.4.1
8.4.2
8.4.3
8.4.4
8.4.4.1
8.4.4.2
8.4.5
8.4.6
8.4.7
8.5
8.5.1
8.5.2
8.5.2.1
8.5.2.2
8.5.2.3
8.5.3
8.5.3.1
8.5.3.2
8.5.4
8.5.4.1
8.5.4.2
8.5.4.3
8.5.5
8.5.5.1
8.5.5.2
8.5.5.3
8.5.5.4
8.5.6
8.5.6.1
CONTENTS (Cont)
Page
Voltage Time Limit (ETL)........................................................................ 7-7
SPECIFICATIONS .................................................................................................... 7-7
Input Specification ............................................................................................. 7-7
Voltage ....................................................................................................... 7-7
Electrical Magnetic Interference Susceptibility......................................... 7-7
Output Specifications ......................................................................................... 7-8
Output Power............................................................................................. 7-8
+5 Vdc, + 12 Vdc, -12 Vdc Specifications .............................................. 7-8
KEYBOARD
INTRODUCTION ..................................................................................................... 8-1
PHYSICAL DESCRIPTION .................................................................................... 8-1
BLOCK DIAGRAM DESCRIPTION ...................................................................... 8-4
Keyboard Scanning ............................................................................................ 8-5
Control of Audio Transducer and Indicators ....................................................
8-5
Keyboard Firmware Functions........................................................................... 8-5
Functions
Not Changed by System Central Processor Instructions ......... 8-5
Functions Changed by System Central Processor Instructions................. 8-6
Firmware Functions
That Can be Changed .............................................. 8-6
DETAILED KEYBOARD CIRCUIT DESCRIPTION ........................................... 8-6
Keyboard Matrix Scanning................................................................................ 8-6
Audio Transducer Control Circuit................................................................... 8-10
Indicator (LED) Control Circuit...................................................................... 8-10
Keyboard Communication ............................................................................... 8-11
Keyboard Transmit Mode ....................................................................... 8-11
Keyboard Receive Mode ......................................................................... 8-12
Reset Signal for 8051 Microprocessor............................................................. 8-12
Hardware Keyboard Identification (ID) .......................................................... 8-12
Voltage Supplies............................................................................................... 8-12
KEYBOARD PROGRAMMING ........................................................................... 8-12
Keyboard Layout and Key Identification........................................................ 8-12
Modes ............................................................................................................... 8-18
Special Considerations Regarding
Auto-RepeaL .................................... 8-18
Special Considerations Regarding
Down/Up Mode................................ 8-19
Auto-Repeat Rates................................................................................... 8-19
Keyboard Peripherals....................................................................................... 8-20
Audio........................................................................................................ 8-20
Indicators (LEDs)..................................................................................... 8-20
Keyboard-to-System Module Protocol............................................................. 8-20
Keycode Transmission ............................................................................. 8-20
Special Code Transmission ...................................................................... 8-20
Power-Up Transmission ........................................................................... 8-22
System Module to Keyboard Protocol............................................................. 8-22
Commands ............................................................................................... 8-23
Parameters ............................................................................................... 8-23
Peripheral Commands.............................................................................. 8-23
Mode Set Commands .............................................................................. 8-28
Special Considerations...................................................................................... 8-30
Error Handling......................................................................................... 8-30
Xl

8.5.6.2
8.5.6.3
8.5.6.4
8.5.6.5
8.5.7
8.6
8.6.1
8.6.2
CHAPTER 9
9.1
9.2
9.2.1
9.2.2
9.3
9.4
9.5
9.6
9.7
9.7.1
9.7.2
9.7.3
9.7.4
9.7.5
9.7.6
9.7.7
9.7.8
9.7.9
9.7.10
9.8
CHAPTER 10
10.1
10.1.1
10.1.2
10.1.3
10.2
10.2.1
10.2.2
10.3
10.3.1
10.3.2
10.3.3
10.3.4
10.3.5
10.4
CONTENTS (Cont)
Page
Keyboard Locked Condition.................................................................... 8-30
Reserved Code ......................................................................................... 8-30
Test Mode ................................................................................................ 8-30
Future Expansion ..................................................................................... 8-30
Default Conditions ........................................................................................... 8-31
SPECIFICATIONS.................................................................................................. 8-31
Functional......................................................................................................... 8-31
Physical............................................................................................................. 8-32
VIDEO MONITOR
INTRODUCTION..................................................................................................... 9-1
BLOCK DIAGRAM DESCRIPTION...................................................................... 9-3
Video Data ......................................................................................................... 9-5
Sync Data........................................................................................................... 9-5
MONOCHROME MONITOR SYSTEM COMMUNICATION ........................... 9-5
COMPOSITE VIDEO SIGNAL............................................................................... 9-6
CRT ............................................................................................................................ 9-7
yOKE ......................................................................................................................... 9-9
MONITOR MODULE .............................................................................................. 9-9
Dynamic Focus................................................................................................. 9-10
Grid Bias .......................................................................................................... 9-10
Horizontal Deflection ....................................................................................... 9-10
Linear Regulator .............................................................................................. 9-11
Vertical Deflection ........................................................................................... 9-11
Video Amplifier................................................................................................ 9-11
Flyback Transformer........................................................................................ 9-12
11 ...................................................................................................................... 9-13
12......................................................................................................................
9~13
PI ..................................................................................................................... 9-13
SPECIFICATIONS.................................................................................................. 9-13
TESTING AND TROUBLESHOOTING
INTRODUCTION................................................................................................... 10-1
Fault Detection Strategy.................................................................................. 10-1
Fatal vs. Nonfatal Errors................................................................................. 10-1
Categories of Testing ....................................................................................... 10-1
ROM-BASED DIAGNOSTICS............................................................................... 10-2
Automatic Selftests .......................................................................................... 10-2
Extended Selftests ............................................................................................ 10-3
DISKETTE-BASED DIAGNOSTICS .................................................................... 10-4
Running the Diskette Diagnostics.................................................................... 10-4
Main Diagnostic Menu Selection 1.................................................................. 10-5
Main Diagnostic Menu Selection 2.................................................................. 10-6
Main Diagnostic Menu Selection 3.................................................................. 10-6
Main Diagnostic Menu Selection 4.................................................................. 10-6
TROUBLESHOOTING
........................................................................................... 10-7
xii

CHAPTER 11
1l.l
11.2
11.2.1
11.2.2
11.2.3
11.2.3.1
11.2.3.2
11.2.4
11.3
11.4
11.S
11.6
11.7
11.8
11.9
CHAPTER 12
12.1
12.2
12.3
CONTENTS (Cont)
Page
SERVICE INFORMATION
INTRODUCTION................................................................................................... 11-1
MONITOR............................................................................................................... 11-1
Monitor Removal ............................................................................................. 11-1
Monitor Module Removal................................................................................ 11-2
Monitor Adjustments ....................................................................................... 11-7
Preparation............................................................................................... 11-7
Checks and Adjustments......................................................................... 11-8
Monitor Module Replacement ....................................................................... 11-14
SYSTEM MODULE REMOVAL ........................................................................ II-IS
RXSO CONTROLLER MODULE REMOVAL.................................................. 11-16
LANGUAGE ROM............................................................................................... 11-16
ROMS 0 AND 1 REMOVAL AND REPLACEMENT .................................... 11-17
DISKETTE DRIVE REMOVAL.......................................................................... 11-18
POWER SUPPLY REMOVAL............................................................................ 11-19
FAN BRACKET ASSEMBLY REMOVAL........................................................ 11-22
RAINBOW 100 CHARACTER SETS
DESCRIPTION ....................................................................................................... 12-1
CHARACTER SET SELECTION......................................................................... 12-S
DISPLAYING CHARACTERS............................................................................. 12-S
APPENDIX A SPARE PARTS, REFERENCE MANUALS, AND ORDERING INFORMATION
Al
A2
A3
SPARE PARTS AND REFERENCE MANUALS............................................... A-I
ORDERING INFORMATION ............................................................................... A-4
RELATED DOCUMENTS...................................................................................... A-4
APPENDIX B ERROR MESSAGES
B.l
B.2 ROM-BASED DIAGNOSTIC
ERROR MESSAGES.............................................B-l
DISKETTE-BASED DIAGNOSTIC ERROR MESSAGES...................................B-l
APPENDIX C GLOSSARY OF TERMS AND ABBREVIATIONS
Figure No.
1-1
1-2
1-3
1-4
I-S
FIGURES
Title Page
Rainbow 100 Computer ............................................................................................. 1-2
Brightness and Contrast Controls............................................................................... 1-3
Keyboard Controls and Indicators.............................................................................. 1-4
System Unit Controls and Indicators (Front) ............................................................ I-S
System Unit Controls and Indicators (Rear) ............................................................. 1-6
Xlll

Figure No.
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
2-12
2-13
2-14
2-15
3-1
3-2
3-3
3-4
3-5
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4-19
4-20
4-21
4-22
4-23
4-24
4-25
4-26
4-27
4-28
FIGURES (Cont)
Title Page
Main System Menu and Error Messages ................................................................... 2-2
Set-Up Key Location.................................................................................................. 2-3
Set-Up Display -Tabs ............................................................................................... 2-5
Set-Up Display -Param(eter) Set(tings) ................................................................... 2-6
Summary
of Parameter Settings ................................................................................ 2-6
Auto-Screen Blank Phantom Cursor........................................................................ 2-10
Set-Up Display -Auto-Answerback ........................................................................ 2-12
Set-Up Display -Modem......................................................................................... 2-13
Set-Up Display -Printer.......................................................................................... 2-15
Set-Up Display -Misc(ellaneous) ............................................................................ 2-17
Set-Up Display -Memory ....................................................................................... 2-17
Connecting the Rainbow 100 Computer to a Host Computer................................ 2-19
Connecting a Communications Cable to the System Unit
(Without Floor Stand) .............................................................................................. 2-21
Connecting a Communications Cable to the System Unit
in the Floor Stand..................................................................................................... 2-22
Communications Connector Pin Numbers............................................................... 2-28
Rainbow 100 Computer Basic System Components..................................................
3-1
System Unit Physical Block Diagram........................................................................ 3-2
Rainbow 100 System Block Diagram ........................................................................
3-3
System Interface Connectors.................................................................................... 3-17
Firmware Organization............................................................................................. 3-34
System Module Block Diagram.................................................................................. 4-2
System Module Physical Layout................................................................................ 4-4
System Module Address and Data Buses...................................................................
4-5
Clock Circuit Block Diagram..................................................................................... 4-7
8088 Clock Pulses ...................................................................................................... 4-8
Z80A Clock Pulses..................................................................................................... 4-9
8088 Processor Block Diagram ................................................................................ 4-10
Typical BIU Bus Cycles ........................................................................................... 4-11
Z80A Processor Block Diagram............................................................................... 4-16
Basic Timing for a Typical
Z80A Read or Write Cycle ........................................ 4-17
8088 Memory Map .................................................................................................. 4-21
Z80A Memory Map................................................................................................. 4-22
System Module Memory .......................................................................................... 4-23
24K Byte
ROM Block Diagram .............................................................................. 4-24
NVM Block Diagram............................................................................................... 4-25
2K Byte Dedicated
RAM Block Diagram............................................................... 4-26
Screen
RAM and Attribute RAM Control ............................................................. 4-27
8088
I/O Decoders................................................................................................... 4-30
Z80A I/O Decoders ................................................................................................. 4-32
Interrupt Logic Block Diagram................................................................................ 4-34
Video Processor Block Diagram............................................................................... 4-37
Line Organization ..................................................................................................... 4-39
Terminator and Address Bytes................................................................................. 4-40
Character
RAM Line Organization ......................................................................... 4-42
Attribute
RAM Line Organization .......................................................................... 4-42
Character Generator
ROM Patterns........................................................................ 4-47
System Module Control, Status, and Diagnostic Registers ..................................... 4-50
Diagnostic Write Register (8088) Format ............................................................... 4-51
XIV

Figure No.
4-29
4-30
4-31
4-32
4-33
4-34
4-35
4-36
4-37
4-38
4-39
4-40
4-41
4-42
4-43
4-44
4-45
4-46
4-47
4-48
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13
5-14
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
6-10
6-11
6-12
6-13
6-14
6-15
6-16
FIGURES (Cont)
Title Page
Diagnostic Read Register (8088) Format ................................................................ 4-55
Communications Status Register (8088) Format..................................................... 4-56
Communications Control Register (8088) Format .................................................. 4-57
General/Diagnostic Status Register (Z80A) Format............................................... 4-58
General/Diagnostic Control Register (Z80A) Format............................................. 4-59
Diskette Drive Status Register (Z80A) Format....................................................... 4-60
Diskette Drive Control Register (Z80A) Format .................................................... 4-62
Muitiprotocol Serial Controller Block Diagram....................................................... 4-64
MPSC Command/Status Registers (Each Channel) ............................................... 4-69
Communications Baud Rate Register Format ......................................................... 4-70
Asynchronous Mode Register Setup ........................................................................ 4-71
Synchronous Mode Register Setup -Monosync/Bisync ......................................... 4-72
Synchronous Mode Register Setup -
HDLC/SOLC ............................................... 4-73
Printer Baud Rate Register Format......................................................................... 4-74
8251A
PUSAR T Block Diagram ............................................................................ 4- 75
Mode Instruction (8251A) Format........................................................................... 4-79
Command Instruction (8251A) Format................................................................... 4-80
Status Register (8251A) Format.............................................................................. 4-81
Transmit and Receive Data Format......................................................................... 4-82
MHFU Detection Block Diagram ............................................................................ 4-83
RX50 Controller Module Physical Layout ................................................................ 5-2
RX50 Controller Module Block Diagram.................................................................. 5-3
Diskette Drive Formatter/Controller Block Diagram................................................ 5-4
Type I Status Register Format ................................................................................ 5-11
Type II Read Sector Status Register Format.......................................................... 5-12
Type II Write Sector Status Register Format......................................................... 5-13
Data Separator Block Diagram ................................................................................ 5-18
MFM Encoding ........................................................................................................ 5-20
Peak Shift Waveform.............................................................................:................. 5-20
Write Data Precompensation ................................................................................... 5-21
Diskette Drive Select Block Diagram ...................................................................... 5-22
Diskette Status Register
Format .............................................................................. 5-24
Diskette Control Register Format............................................................................ 5-24
General/Diagnostic Status Register Format............................................................ 5-27
RX50 Dual-Diskette System Relation ....................................................................... 6-2
RX50 Dual-Diskette Drive......................................................................................... 6-3
The
5-1/4 Inch Diskette............................................................................................. 6-3
Write-Protect Tab Application................................................................................... 6-4
Opening Access Doors ................................................................................................ 6-5
Inserting Diskette........................................................................................................ 6-6
Closing Access Doors ................................................................................................. 6-6
Simple Block Diagram................................................................................................ 6-8
Mechanical Detail....................................................................................................... 6-9
Drive Mechanism Functional Detail......................................................................... 6-10
Select Circuit Functional Detail ............................................................................... 6-11
Motor Control Circuit Functional Detail ................................................................. 6-15
Motor Control Wave Forms..................................................................................... 6-17
Electrical Connections to Head Load Solenoids and LEDs..................................... 6-18
Status Circuit Detail................................................................................................. 6-19
Status Circuit Timing Relationships ........................................................................ 6-19
xv

Figure No.
6-17
6-18
6-19
6-20
6-21
6-22
6-23
6-24
6-25
6-26
6-27
6-28
6-29
6-30
7-1
7-2
7-3
7-4
7-5
8-1
8-2
8-3
8-4
8-5
8-6
8-7
8-8
8-9
8-10
8-11
8-12
8-l3
8-14
8-15
8-16
8-17
9-1
9-2
9-3
9-4
9-5
9-6
9-7
9-8
10-1
10-2
10-3
10-4
11-1
11-2
FIGURES (Cont)
Title
Page
Sensor Detail............................................................................................................. 6-20
Stepper Motor Circuit Detail ...................................................................................
6-21
Stepper Motor Timing Relationships ....................................................................... 6-22
Read/Write Interface Circuit Detail........................................,............................... 6-23
Write Data Timing Relationships............................................................................. 6-24
Read Data Timing Relationships ............................................................................. 6-24
Write Circuit Detail.................................................................................................. 6-26
Write Data to Head Current Conversion................................................................. 6-27
Read Circuit Detail .................................................................................................. 6-28
Head Signal to Read Data Conversion .................................................................... 6-29
RX50 Controller and Drive Interface Signal Flow.................................................. 6-30
Seek and Interface Module Connector Locations....................................................
6-31
Motor Control Module Connector Locations........................................................... 6-35
Read/Write Module Connector Locations............................................................... 6-36
System Block Diagram............................................................................................... 7-2
Power Supply Connectors...........................................................................................
7-3
Power Supply Latch Types ........................................................................................ 7-4
AC Input Connector, Circuit Breaker, and AC Selector Switch .............................. 7-4
Power Supply Functional Diagram ............................................................................
7-5
System Block Diagram............................................................................................... 8-2
LK201 Keyboard........................................................................................................ 8-3
Keyboard Cable Connections ..................................................................................... 8-4
Simplified Block Diagram of LK201 Keyboard Circuitry ........................................ 8-4
Simplified Block Diagram of Matrix Scanning Circuit ............................................. 8-6
Example of Ghost Key Generation............................................................................
8-7
LK201 Keyboard Layout ........................................................................................... 8-9
Audio Transducer (Beeper) Control Circuit............................................................. 8-10
Indicator (LED) Control Circuit .............................................................................. 8-11
Keyboard Transmit and Receive Character Format ............................................... 8-11
System Module to Keyboard Protocol ..................................................................... 8-23
Indicator (LED) Parameter...................................................................................... 8-26
Indicator (LED) Layout ........................................................................................... 8-26
Audio Volume Parameter......................................................................................... 8-26
Setting Key Transmission Mode .............................................................................. 8-28
Setting Auto-Repeat Rate Buffer Association ......................................................... 8-28
Setting Auto-Repeat Rate Buffer Values................................................................. 8-29
System Block Diagram............................................................................................... 9-2
VR201 Monochrome Monitor Exterior View ............................................................ 9-3
VR201 Monochrome Monitor Block Diagram .......................................................... 9-4
VR201 Monochrome Monitor System Communications Diagram............................ 9-4
Composite Video Signal Representation .................................................................... 9-6
Composite Video Sync Timing Diagram ...................................................................
9-8
Monitor Module Block Diagram .............................................................................. 9-10
Monitor Module PI Pin-out ..................................................................................... 9-13
Main System Menu With Nonfatal Error Message ................................................ 10-2
Fatal Error Message ................................................................................................. 10-3
Main Diagnostic Menu ............................................................................................. 10-4
Individual Test Menu ............................................................................................... 10-5
Monitor Cover Removal.......................,..................................,................................. 11-2
Sources of High Voltage........................................................................................... 11-3
xvi

Figure No.
11-3
11-4
11-5
11-6
11-7
11-8
11-9
11-10
11-11
11-12
11-13
11-14
11-15
11-16
11-17
11-18
11-19
12-1
12-2
12-3
12-4
12-5
12-6
B-1
Table No.
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
FIGURES (Cont)
Title
Page
Discharging CRT Anode.......................................................................................... 11-4
Anode Removal ........................................................................................................ 11-5
Removing
CRT Connector....................................................................................... 11-6
Monitor Module Rear Panel Removal..................................................................... 11-6
Monitor Module Standoff Removal ......................................................................... 11-7
Monitor Module Controls -Left Side ..................................................................... 11-9
Monitor Module Controls -Right Side ................................................................... 11-9
Vertical Centering and Rotation Check With Alignment Template..................... 11-10
Horizontal Centering for Color/Graphics Option.................................................. 11-12
Aspect Ratio ........................................................................................................... 11-13
RX50 Controller Module RemovaL ...................................................................... 11-16
Language
ROM Removal....................................................................................... 11-17
Diskette Drive 4-Wire Power Cable Removal....................................................... 11-19
Slide Diskette Drive Forward.... 00' ........................................................................... 11-20
Power Supply Connectors....................................................................................... 11-21
Power Supply Latches ............................................'................................................ 11-21
Fan Bracket Assembly Removal ............................................................................ 11-23
DEC 'Multinational Character Set............................................................................ 12-2
Special Graphics Character Set................................................................................ 12-3
Character
Set Designations ...................................................................................... 12-4
Character
Set Selection ............................................................................................ 12-5
Character Generator
ROM Displayable Characters................................................ 12-6
Keyboard Output Processing.................................................................................... 12-7
Example
of LED Display on the Back of the System Unit...................................... B-1
TABLES
Title
Page
Parameter Settings Major Heading............................................................................ 2-7
Parameters Set for CP/M-86/80 Compatibility ....................................................... 2-8
Modem Data Bits and Parity Selection.................................................................... 2-14
Modem Protocols...................................................................................................... 2-15
Baud Rates for Digital Equipment Corporation's
Personal Printers...............,........................................................................................ 2-16
Communications Protocols ....................................................................................... 2-23
Modem Connect Conditions..................................................................................... 2-24
Communications Connector Signals......................................................................... 2-26
8088 Interrupt Addresses ......................................................................................... 3-11
System Module Connectors...................................................................................... 3-16
Communications Connector (J1) Signals ................................................................. 3-18
Communications Signal Functions ........................................................................... 3-19
Printer Connector (12) Signals ................................................................................. 3-21
Keyboard/Monitor Connector (13) Signals.............................................................. 3-22
Extended Communications Connector (J4) Signals ................................................. 3-23
Extended Communications Connector (J5) Signals ................................................. 3-24
Memory Extension Connector (J6) Signals.............................................................. 3-26
Graphics Connector (17) Signals.................................................;............................ 3-28
Power Supply Connectors (J8) Signals..................................................................... 3-30
XVll

Table No.
3-12
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4-19
4-20
4-21
4-22
4-23
4-24·
4-25
4-26
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13
5-14
5-15
5-16
5-17
5-18
5-19
6-1
6-2
6-3
6-4
TABLES (Cont)
Title Page
RX50 Controller Connector (J9) Signals................................................................. 3-31
8088 Processor Pin Descriptions .............................................................................. 4-12
Segment Register Status Encoding .......................................................................... 4-15
Z80A Processor Pin Descriptions............................................................................. 4-18
8088 I/O Addresses ................................................................................................. 4-31
Z80A I/O Addresses................................................................................................ 4-33
8088 Interrupt Vector Addresses ............................................................................. 4-35
DC11 Command Codes............................................................................................ 4-43
DC12 Command Codes............................................................................................ 4-44
Character Generator Scan Addresses....................................................................... 4-46
Diagnostic Write Register (8088) Bit Description ................................................... 4-51
Printer Port Diagnostic Signal Routing ................................................................... 4-52
Printer Port Diagnostic Signal Description .............................................................. 4-52
Port Loopback Signal Routing................................................................................. 4-53
Port Loopback Signal Description............................................................................ 4-54
Diagnostic Read Register (8088) Bit Description .................................................... 4-55
Communications Status Register (8088) Bit Description ........................................ 4-56
Communications Control Register (8088) Bit Description ...................................... 4-57
General/Diagnostic Status Register (Z80A) Bit Description .................................. 4-59
General/Diagnostic Control Register (Z80A) Bit Description ................................ 4-60
Diskette Drive Status Register (Z80A) Bit Description .......................................... 4-61
Diskette Drive Control Register (Z80A) Bit Description ........................................ 4-62
Write Data Precompensation Codes ........................................................................ 4-62
MPSC Pin Descriptions............................................................................................ 4-65
MPSC Register Addressing...................................................................................... 4-68
Communications Baud Rate Selection..................................................................... 4-70
8251A PUSART Pin ·Descriptions........................................................................... 4-76
Formatter/Controller Register Selection....................................................................
5-5
Type I Command Bit Description.............................................................................. 5-7
Type I Command Flags..............................................................................................
5-7
Type II Command Bit Description............................................................................. 5-8
Type II and
III Command Flags................................................................................ 5-9
Type
III Command Bit Description ........................................................................... 5-9
Type IV Command Flags .........................................................................................
5-1 0
Formatter/Controller Command Summary............................................................. 5-10
Type I Status Register Bit Description .................................................................... 5-11
Type II Read Sector Status Register Bit Description.............................................. 5-12
Type II Write Sector Status Register Bit Description............................................. 5-13
Formatter/Controller Register Delays ..................................................................... 5-14
Formatter/Controller Pin Descriptions .................................................................... 5-15
Drive Select Decoding .............................................................................................. 5-22
Diskette Status Register Bit Descriptions ................................................................ 5-25
Diskette Control Register Bit Descriptions .............................................................. 5-26
General/Diagnostic Status Register Bit Descriptions .............................................. 5-27
RX50 Controller Connector (11) Signals................................................................. 5-28
RX50 Controller Connector (J2 and 13) Signals..................................................... 5-31
Select Signals Jumper J17 Removed ....................................................................... 6-14
Select Signals Jumper 117 Installed......................................................................... 6-14
Write Function Head Select..................................................................................... 6-27
Read Function Head Select...................................................................................... 6-29
xviii

Table No.
8-1
8-2
8-3
8-4
8-5
8-6
9-1
9-2
9-3
9-4
10-1
10-2
A-I
A-2
B-1
B-2
TABLES (Cont)
Title Page
Keyboard Matrix (LK20l-AA)..................................................................................
8-8
Keyboard Functional Divisions................................................................................. 8-13
Keycode Translation Table....................................................................................... 8-14
Peripheral Commands in Hexadecimal .................................................................... 8-25
Keyboard Division Default Modes ........................................................................... 8-30
Default Rates in Auto-Repeat Buffers..................................................................... 8-31
Jl Pin-out ................................................................................................................... 9-5
J3 Pin-out ..............................................
~ ..................................................................... 9-6
Composite Video Values............................................................................................. 9-7
Composite Video Sync Component............................................................................ 9-9
Time to Complete Diagnostic Tests......................................................................... 10-6
Troubleshooting Guide.............................................................................................. 10-7
Rainbow 100 Computer Recommended Spares List................................................ A-I
Reference Manuals .................................................................................................... A-3
Internal Diagnostic Test Message............................................................................... B-2
Diskette-Based Diagnostic Error Message.................................................................. B-6
xix