Digital Equipment RX02 User manual

!DmD~lI RX02

EK-ORX02-TM-001
RX02 Floppy Disk System
Technical Manual
digital equipment corporation. maynard, massachusetts

1st Edition, October 1978
Copyright @
1978 by Digital Equipment Corporation
The material in this manual
is for informational purposes and is
subject to change without notice.
Digital Equipment Corporation assumes no responsibility for any
errors which may appear in this manual.
Printed in U.S.A.
This document was set on DIGITAL's DECset-8000 computerized
typesetting system.
The following are trademarks
of Digital Equipment Corporation,
Maynard, Massachusetts:
DIGITAL
DEC
PDP
DECUS
UNIBUS
DECsystem-l0
DECSYSTEM-20
DIBOL
EDUSYSTEM
VAX
VMS
MASSBUS
OMNIBUS
OS/8
RSTS
RSX
lAS

PREFACE
CHAPTER 1
1.1
1.2
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.3
1.3.1
1.3.1.1
I ~ 1 2
1.3.1.3
1.3.2
1.3.2.1
1.3.2.2
1.3.2.3
1.4
1.5
1.5.1
1.5.2
1.5.2.1
1.5.2.2
1.5.3
1.5.3.1
1.5.3.2
1.5.3.3
1.5.3.4
CHAPTER 2
2.1
2.1. ]
2.1.2
2.1.3
2.1.3.1
2.1.3.2
CONTENTS
Page
GENERAL INFORMATION
INTRODUCTION .............................................................................................. 1-1
GENERAL DES<:: RI PTION ...............................................................................1-2
Interface Modules ........................................................................................1-2
Microprogrammed Controller......................................................................1-2
Read/Write Electronics................................................................................1-2
Electromechanical Dri
ve .............................................................................. 1- 2
Power Supply ...............................................................................................
1-4
OPTION DESCRIPTION ................................................................................... 1-4
Operation For Single Density Recording Only (RX8E, RXII, RXVll) ........ 1-6
PDP-8 Operation ..................................................................................1-6
PDP-!! Operation................................................................................ 1··6
LSI-II Operation .................................................................................1-7
Operation For Single or Double Density Recording RX28, RX2II,
RXV211 )......................................................................................................1-7
PDP-8
Operation ..................................................................................1-7
PDP-II Operation ................................................................................1-7
LSI-II
Operation ................................................................................. 1-7
SPECIFI CATIONS .............................................................................................1-8
SYSTEMS
CO MPATIBILITY ............................................................................1-9
Media ........................................................................................................... 1-9
Recording Scheme......................................................................................1-10
Double Frequency (FM) .....................................................................I-IO
Miller Code (MFM) ........................................................................... 1-10
Logical Format ........................................................................................... 1-12
Header Field Description.................................................................... 1-1 3
Data Field Description ....................................................................... 1-13
Track Usage .......................................................................................1-14
CRC Capability..................................................................................1-14
INSTALLATION
SITE PREPARATION ........................................................................................ 2-1
Space............................................................................................................ 2-1
Cabling ........................................................................................................2-2
AC Power.....................................................................................................2-3
Power Requirements ............................................................................2-3
Input Power Modification Requirements..............................................2-3
iii

2.1.4
2.2
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.4
2.4.1
2.4.2
2.4.3
2.4.3.1
2.4.3.2
2.4.3.3
2.5
2.6
CHAPTER 3
3.1
3.2
3.2. i
3.2.2
3.2.2.1
3.2.2.2
3.2.3
3.3
3.4
CHAPTER 4
4.1
4.1.1
4.1.2
4.1.2
.1
4.1.2.2
4.1.2.3
4.1.2.4
4.1.2.5
4.1.2.6
4.1.2.7
4.1.2.8
4.1.3
CONTENTS (Cont)
Page
Fire and Safety Precautions ..........................................................................2-4
CONFIGURATION GUIDELINES ..................................................................2-4
ENVIRONMENTAL CONSIDERA TIONS .......................................................2-4
General ........................................................................................................2-4
Temperature, Relative Humidity ..................................................................2-4
Heat Dissipation ..........................................................................................2-4
Radiated &nissions......................................................................................2-4
Cleanliness...................................................................................................2-6
UNPACKING AND INSPECTION ...................................................................2-6
General ........................................................................................................2-6
Tools............................................................................................................2-6
Unpacking ...................................................................................................2-6
Cabinet-Mounted .................................................................................2-6
Separate Container...............................................................................2-7
Inspection ............................................................................................2-7
INSTALLATION ................................................................................................2-7
TESTING .......................................................................................................... 2-11
USER INFORMATION
CUSTOMER RESPONSIBILITY .......................................................................3-1
CARE OF MEDIA ..............................................................................................3-1
Handling Practices and Precautions..............................................................3-1
Diskette Storage...........................................................................................3-2
Short Term (Available for Immediate Use) ...........................................3-2
Long Term ...........................................................................................3-2
Shipping Diskettes........................................................................................3-2
OPERATING INSTRUCTIONS ........................................................................3-3
OPERATOR TROUBLESHOOTIN G __ .. _ """"""'''''''''' ''''''''''"., .......................3-3
PROGRAMMING
RX8E and RX28 PROGRAMMING INFORMATION .................................... .4-1
Device Codes................................................................................................4-1
Instruction Set..............................................................................................4-2
RX8E Load Command (LCD) -67xl ...................................................4-2
RX28 Load Command - (First byte 67xl, Second byte 67x2) ................4-3
Transfer Data Register (XDR) -67x2 ...................................................4-3
STR -67x3 ...........................................................................................4-4
SER -67x4 ...........................................................................................4-4
SDN -67x5 ..........................................................................................4-4
INTR -67x6 ........................................................................................4-4
INIT -67x7..........................................................................................4-4
Register Description.....................................................................................4-4
iv

4.1.3.1
4.1.3.2
4.1.3.3
4.1.3.4
4.1.3.5
4.1.3
.6
4.1.3.7
4.1.4
4.1.4.1
4.1.4.2
4.1.4
.3
4.1.4.4
4.1.4.5
4.1.4.6
4.1.4.7
4.1.4.8
4.1.4.9
4.1.4.10
4.1.5
4.1.5.1
4.1.5.2
4.1.6
4.1.6.1
4.1.6.2
4.1.6.3
4.1.7
4.1.8
4.2
4.2.1
4.2.2
4.2.2.1
4.2.2.2
4.2.2.3
4.2.2.4
4.2.2.5
4.2.2.6
4.2.3
4.2.3.1
4.2.3.2
4.2.3.3
4.2.3.4
4.2.3.5
4.2.3.6
4.2.3.7
CONTENTS (Coot)
Page
Command Register...............................................................................4-4
Error Code Register .............................................................................4-5
RX2TA -
RX Track Address................................................................4-6
RX2SA - RX Sector Address ...............................................................4-6
RX2DB -RX
Data Buffer....................................................................4-7
RX8E -
RX Error and Status ...............................................................4-7
RX28 -
RX Error and Status................................................................4-8
Function Code Description ..........................................................................4-9
Fill Buffer (000) ..................................................................................4-10
Empty Buffer (001) .............................................................................4-10
Write Sector (010)............................................................................... 4-11
Read Sector (011) ............................................................................... 4-11
Set Media Density (l00) for RX28 Only.............................................. 4-11
Maintenance Read Status (101) for RX28 Only...................................4-12
Read Status (101) for
RX8EOnly .......................................................4-12
Write Deleted
Da ta Sector( 11 0) .........................................................4-12
Read
Error Code Function (111).........................................................4-12
Power Fail ..........................................................................................4-12
Ericr Recovery ...........................................................................................4-13
RX8E.................................................................................................4-13
RX28..................................................................................................4-13
RX8E Programming Examples...................................................................4-14
Write/Write Deleted Data/Read Functions........................................4-14
Empty Buffer Function.......................................................................4-16
Fill Buffer Function............................................................................4-17
RX28 Programming Examples....................................................................4-17
Restrictions and Programming Pitfalls........................................................4-23
RXII and RXVl1 PROGRAMMING INFORMATION .................................4-24
Register and Vector Addresses.............................................,'.....................4-24
Register Description...................................................................................4-24
RXCS - Command and Status (177170)..............................................4-24
RXDB -
Data Buffer Register (177172) ..............................................4-26
RXTA -
RX Track Address ...............................................................4-26
RXSA - RX Sector Address ...............................................................4-26
RXDB -
RX Data Buffer....................................................................4-27
RXES -RX Error and Status .............................................................4-27
Function Codes..........................................................................................4-28
Fill Buffer (000) ..................................................................................4-29
Empty Buffer (001) .............................................................................4-29
Write Sector (010)...............................................................................4-29
Read Sector (011) ...............................................................................4-30
Read Status(101)................................................................................4-30
Write Sectorwith Deleted Data (110)..................................................4-31
Read Error
Code Function (111 ).........................................................4-31
v

4.2.3.8
4.2.4
4.2.4.1
4.2.42
4.2.4.3
4.2.5
4.2.6
4.3
4.3.1
4.3.2
4.3.2.1
4.3.2.2
4.3.2.3
4.3.2.4
4.3.2.5
4.3.2.6
4.3.2.7
4.3.2.8
4.3.3
4.3.3.1
4.3.3.2
4.3.3.3
4.3.3.4
4.3.3.5
4.3.3.6
4.3.3.7
4.3.3.8
4.3.3.9
4.3.4
4.3.5
4.3.5.1
4.3.5.2
CHAPTER 5
5.1
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
5.1.6
5.2
5.2.1
CONTENTS (Cont)
Page
Power Fail .......................................................................................... 4-31
Programming Examples..............................................................................4-31
Read Data/Write Data ....................................................................... 4-31
Empty Buffer Function.......................................................................4-33
Fill Buffer Function............................................................................
4-3 3
Restrictions
and Programming Pitfalls........................................................4-33
Error Recovery...........................................................................................4-35
RX211
and RXV21 PROGRAMMING INFORMATION ...............................4-36
Register
and Vector Addresses....................................................................4-37
Register Description ...................................................................................4-37
RX2CS - Command and Status (177170)............................................4-37
RX2DB -
Data Buffer Register (177172).............................................4-38
RX2TA -
RX Track Address................................................................4-38
RX2SA - RX Sector Address..............................................................4-39
RX2WC -
RX Word Count Register ..................................................4-39
RX2BA -
RX Bus Address Register....................................................4-39
RX2DB - RX Data Buffer..................................................................4-40
RX2ES -
RX Error and Status............................................................4-40
Function Codes ..........................................................................................4-41
Fill Buffer (000) ..................................................................................4-41
Empty Buffer(001) .............................................................................4-42
Write Sector(010)...............................................................................4-42
Read Sector (011) ...............................................................................4-43
Set Media Density (100)......................................................................4-43
Maintenance Read Status (101)...........................................................4-44
Write Sector with Deleted
Data (110)..................................................4-44
Read Error Code (111)........................................................................4-44
RX02 Power Fail................................................................................4-44
Error Recovery...........................................................................................4-45
R)f~ 11 /RXV2I Programming Examples .. ., ..."...........................................4-45
Write/Fill Buffer ................................................................................4-45
Read/Empty Buffer............................................................................4-46
THEORY OF OPERATION
OVERALL SYSTEM BLOCK DIAGRAM ....................................................... .5-1
Omnibus to RX8E/RX28 Interface Signals .................................................. 5-1
Unibus to RXll/RX211 Interface Signals....................................................5-3
LSI-II Bus to RXV11/RXV21 Interface Signals...........................................5-4
Interface
Module to ~CPU Controller Signals ..............................................5-6
~CPU Controller to Read/Write Electronics Signals ....................................5-8
Read/Write Electronics to Drive Signals ......................................................5-9
INTERFACE MODULES BLOCK DIAGRAM DESCRIPTION ...................5-10
RX8E/RX28 Interface (M8357) Block Diagram Description ......................5-10
vi

5.2.1.1
5.2.1.2
5.2.1.3
5.2.1.4
5.2.1.5
5.2.2
5.2.2.1
5.2.2.2
5.2.2.3
5.2.2.4
5.2.2.5
5.2.2.6
5.2.3
5.2.3.1
5.2.3.2
5.2.3.3
5.2.3.4
5.2.3.5
5.2.3.6
5.2.3.7
5.2.4
5.2.4
.1
5.2.4.2
5.2.4.3
5.2.4.4
5.2.4.5
5.2.4.6
5.2.4.7
5.2.4.8
5.2.5
5.2.5.1
5.2.5.2
5.2.5.3
5.2.5.4
5.2.5.5
5.2.5.6
5.2.5.7
5.2.5.8
5.3
5.3.1
5.3.1.1
5.3.1.2
5.3.1.3
5.3.1.4
CONTENTS (Coot)
Page
Device Select and
lOT Decoder ..........................................................5-10
Interrupt Control and Skip Logic........................................................5-12
C Line Select Logic .............................................................................5-12
Interface Register ...............................................................................5-12
Sequence and Function Control Logic ................................................5-13
RXll Interface(M7846) Block Diagram Description..................................5-14
Address Decoder ................................................................................5-14
Data Path Selection ............................................................................5-14
Interface Data Buffer Register ............................................................5-16
Sequence
and Function Control Logic ................................................5-16
Interrupt Control Logic......................................................................5-17
Vector Address Generator..................................................................5-17
RXV
11 Interface (M7946) Block Diagram Description...............................5-17
Address Decoding Logic.....................................................................5-17
I/0 Control Logic .............................................................................. 5-17
RX Data Buffer (RXDB) Register ......................................................5-17
RX
Command/Status (RXCS) Register.............................................. 5-17
Status and Control Signal Interface Logic ...........................................5-19
Interrupt Contro 1Logic...................................................................... 5-1 9
Initialize Logic....................................................................................5-19
RX211 Interface (M8256) Block Diagram Description................................5-19
Address Decoder, Buffer Selector, SSYN Register ..............................5-19
Command and Status Buffer...............................................................5-20
Data Buffer ........................................................................................5-20
Data Input/Output and TRANSMIT DA TA CIRCUIT ....................5-20
Address Circuits .................................................................................5-20
Interface Control Circuits...................................................................5-20
Bus Control Circuits............................................................................5-22
InterruptCircuits................................................................................5-22
RXV21 Interface (M8029) Block Diagram Description ...............................5-22
Input/Output Transceiver, Buffer Selector..........................................5-22
Command
and Status Buffer...............................................................5-22
Data Buffer ........................................................................................5-24
Input/Output Transceiver and Transmit/Receive Data Circuit...........5-24
Address Circuits .................................................................................5-24
Interface Control Circuits...................................................................5-24
Bus Control Circuits ...........................................................................5-25
Interrupt Circuits................................................................................
5-2 5
UNIT LEVEL DESCRIPTION ......................................................................... 5-25
Microprogrammed Controller (M7744) Hardware Description................... 5-25
PROM, ROM Register, Processor and Sequencer Circuits.................. 5-25
Branch Control Circuits......................................................................5-30
I/O Control Circuits...........................................................................5-30
Sector Buffer
and Control Circuits...................................................... 5-31
vii

5.3.1.5
5.3.1.6
5.3.1.7
5.3.2
5.3.2.1
5.3.2.2
5.3.2.3
5.3.2.4
5.3.2.5
5.3.2.6
5.3.2.7
5.3.2.8
5.3.2.9
5.3.2.10
5.3.2.11
5.3.2.12
5.3.2.13
5.3.3
5.3.3.1
5.3.3.2
5.3.3.3
5.3.4
5.3.4.1
5.3.4.2
~ -. A -.
~."'.'+.'"
5.3.4.4
CHAPTER 6
6.1
6.2
6.2.1
6.2.2
6.3
6.4
6.4.1
6.4.2
6.5
6.5.1
CONTENTS (Coot)
Page
Data Selection and CRC Circuits........................................................ 5-31
Timing and Synchronizing Circuits.....................................................5-32
Power Fail Circuit ..............................................................................5-32
MicroprogrammedController Software Description...................................5-32
Initialize Routine................................................................................5-32
Find Header
(FIND HD) Subroutine.................................................5-32
Read Address
Mark (RDAM) Subroutine..........................................5-35
Read
(RD) Sector Subroutine.............................................................5-35
Write/Write Sector Subroutine...........................................................5-35
Read Error Register
(RDERRG) and Set Density (SET DEN)
Subroutines ........................................................................................5-35
Fill/Empty Buffer Routine .................................................................5-35
Find Track Subroutine .......................................................................5-35
Decode
Command (DECCMD) Routine............................................5-45
Maintenance Read Status (MRDST) and Check Ready
(CHKRDY) Subroutines....................................................................5-45
Get Parameter (GET PAR), Step Head (STEPHD), Wait,
Wait Run, and Write Zeros (WRTS) Subroutines ...............................5-45
Find Sector (FINDSE), Send Word
12 (SNDWI2),
Send Word 8 (SNDW8), Get Command (GET CMD), and
Get Word (GET WRD) Subroutines...................................................5-45
Maintenance Check Ready
(MAINT CHK) Subroutine ..................... 5-45
Read/Write Block Diagram Description.....................................................5-52
Drive
and Head Control .....................................................................5-52
Position
Data Selection.......................................................................5-52
Read/Write Circuit ............................................................................5-52
Mechanial Drive Description......................................................................
5-55
Drive Mechanism ............................................................................... 5-55
Spindie Mechanism ............................................................................5-55
Positioning Mechanism ..................................,,,.,,..............................5-55
Head Load Mechanism.......................................................................5-58
MAINTENANCE
EQUIPMENT CARE .......................................................................................... 6-1
TROUBLESHOOTING THE RX02 ................................................................... 6-1
M7744, M7745 Failures................................................................................ 6-1
Drive Failures .............................................................................................. 6-1
TROUBLESHOOTING WITH DIAGNOSTICS ............................................... 6-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC ......................................6-2
RX211
and RXV21 Systems ......................................................................... 6-2
PDP-8 and CM05-8 Based Systems............................................................... 6-5
REMOVAL AND REPLACEMENT .................................................................. 6-5
Module Replacement Procedures ................................................................. 6-5
viii

6.5.2
6.5.3
6.5.4
6.5.5
6.5.6
CONTENTS (Cont)
Page
Drive Replacement Procedure ......................................................................6-8
Front Handle Replacement Procedure ..........................................................6-8
Drive
Motor Replacement Procedures ..........................................................6-9
Drive Belt
Replacement Procedures............................................................6-10
Quick Check For Belt on Pulleys.................................................................6-10
APPENDIX A RX02 SUMMARY
Figure No.
1-1
1-2
1 '1
1. '.-'
1-4
1-5
1-6
1-7
1-8
1-9
1-10
2-1
2-2
2-3
2-4
2-5
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
FIGURES
Title Page
Floppy Disk Configuration ..................................................................................1-3
Front View of the Floppy Disk System ................................................................. 1-4
Interface ~,,1odules ................................................................................................ i-5
Top View of RX02 ................................................................................,..............1-6
Underside View
of Drive ......................................................................................1-7
Diskette
Media ....................................................................................."............ 1-10
Flux Reversal Patterns for FM ........................................................................... 1-11
FM Versus MFM Encoding ...............................................................................1-12
Track Format (Each Track) ................................................................................1-12
Sector
Format (Each Sector)............................................................................... 1-13
RX02 Outline Dimensions ................................................................................... 1-1
Cabinet Layout Dimensions .................................................................................2-2
RX02 Rear View ............................................................................."...................2-3
RX02 Unpacking .................................................................................................2-8
RX02 Cabinet Mounting Information ................................................................. 1-9
LCD Word Format (RX8E) .................................................................................4-2
Command Word Format (RX28) .........................................................................4-3
Command Register Format (RX8E) .....................................................................4-4
Command Register Format (RX28F) ...................................................................4-5
Error Code Register Format (RX8E/RX28A) .........................,............................4-6
RX2TA Format (RX8E/RX28) ...........................................................................4-7
RX2SA Format (RX8E/RX28) ............................................................................4-7
RX2DB Format (RX8E/RX28) ...........................................................................4-7
RXES Format (RX8E) ..................................................................,......................4-7
RX2ES
Format (RX28)................................................................,.......................4-8
RX8E Write/Write Deleted Data/Read Example...............................................4-15
RX8E Empty Buffer Example.............................................................................4-17
RX8E Fill Buffer Example ..................................................................................4-18
ix