Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 17 views

    2120-0067 DQ419 Floppy Controller Manual W Schematics Mar85 1-6

    Uploaded by

    switch switch
    The document describes a floppy disk controller that is compatible with DEC's RXV21 system. It supports one or two dual density floppy disk drives in either single or double sided configurations. The controller provides 512KB of storage per diskette. It is a single module that plugs directly into a Q-bus and interfaces with Shugart-compatible drives via a 50-conductor ribbon cable. The controller has features such as a transparent firmware bootstrap, write precompensation, power fail protection, and interrupt priority levels compatible with LSI-11 CPUs.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    2120-0067 DQ419 Floppy Controller Manual W Schematics Mar85 1-6

    Uploaded by

    switch switch
    17 views6 pages
    The document describes a floppy disk controller that is compatible with DEC's RXV21 system. It supports one or two dual density floppy disk drives in either single or double sided configurations. The controller provides 512KB of storage per diskette. It is a single module that plugs directly into a Q-bus and interfaces with Shugart-compatible drives via a 50-conductor ribbon cable. The controller has features such as a transparent firmware bootstrap, write precompensation, power fail protection, and interrupt priority levels compatible with LSI-11 CPUs.

    Original Description:

    Original Title

    2120-0067_DQ419_Floppy_Controller_Manual_w_Schematics_Mar85_1-6

    Copyright

    © © All Rights Reserved

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    The document describes a floppy disk controller that is compatible with DEC's RXV21 system. It supports one or two dual density floppy disk drives in either single or double sided configurations. The controller provides 512KB of storage per diskette. It is a single module that plugs directly into a Q-bus and interfaces with Shugart-compatible drives via a 50-conductor ribbon cable. The controller has features such as a transparent firmware bootstrap, write precompensation, power fail protection, and interrupt priority levels compatible with LSI-11 CPUs.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    17 views6 pages

    2120-0067 DQ419 Floppy Controller Manual W Schematics Mar85 1-6

    Uploaded by

    switch switch
    The document describes a floppy disk controller that is compatible with DEC's RXV21 system. It supports one or two dual density floppy disk drives in either single or double sided configurations. The controller provides 512KB of storage per diskette. It is a single module that plugs directly into a Q-bus and interfaces with Shugart-compatible drives via a 50-conductor ribbon cable. The controller has features such as a transparent firmware bootstrap, write precompensation, power fail protection, and interrupt priority levels compatible with LSI-11 CPUs.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 6

    Part Number 2120-0067

    OQ419
    FLOPPY DISC CONTROLLER
    INSTRUCTION MANUAL

    March 1985

    ~Rnmm
    DISTRIBUTED LOGIC CORPORATION
    1555 S. Sinclair Street
    P.O. Box 6270
    Anaheim, California 92806
    I I Telephone: (714) 937·5700
    Telex: 6836051
    Contents
    SECTION 1 - GENERAL INFORMATION
    1.1 INTRODUCTION 1
    1.2 GENERAL DESCRIPTION 2
    1.3 COMPATIBILITY 2
    1.4 LOGICAL TRACK FORMAT 3
    1.4.1 Sector Header Field 3
    1.4.2 Data Field 5
    1.4.3 CRC - Cyclic Redundancy Check 5
    1.5 RECORDING SCHEME 6
    1.6 SPECIFICATIONS 6

    SECTION 2 - INSTALLATION
    2.1 CONTROLLER JUMPER CONFIGURATIONS 7
    2.1.1 Device and Vector Address Selection 8
    2.1.2 Device Interrupt Priority 9
    2.1.3 Bootstrap 10
    2.1.4 Wri te Precompensati on 10
    2.1.5 Write Current Control 11
    2.1.6 Drive Step Rate 11
    2.2 DRIVE CONFIGURATIONS 11
    2.3 CABLING 19
    2.4 CONTROLLER INSTALLATION 21
    2.5 INITIAL CHECKOUT 21
    SECTION 3 - OPERATION
    3.1 GENERAL INFORHATION 23
    3.2 BOOTSTRAPPING 23
    3.3 FORMATTING 24
    3.4 FILL/WRITE OPERATION 25
    3.5 READ/EMPTY OPERATION 27
    3.6 OPERATION USING RT-ll 27
    SECTION 4 - PROGRAMMING
    4.1 GENERAL INFORMATION 29
    4.2 COMMAND AND STATUS REGISTER - RXVCS (177170) 30
    4.3 DATA BUFFER (177172) 31
    4.3.1 Data Buffer Register (RXVDB) 32
    4.3.2 Trace Address Register (RXVTA) 32
    4.3.3 Sector Address Register (RXVSA) 32
    4.3.4 Word Count Register (RXVWC) 32
    4.3.5 Bus Address Register (RXVBA) 33
    4.3.6 Error and Status Register (RXVES) 33
    4.3.7 Bus Address Extension Register (RXVBAE) 35

    ii;
    4.4 EXTENDED STATUS REGISTERS 35
    4.5 COMMAND PROTOCOL 36
    4.5.1 Fill Buffer (000) 36
    4.5.2 Empty Buffer (001) 37
    4.5.3 Write Buffer (010) 38
    4.5~4 Read Sector (011) 38
    4.5.5 Set Media Density (100) 39
    4.5.6 Read Status (101) 40
    4.5.7 Write Deleted Data Sector (110) 40
    4.5.8 Read Error Code (111) 40
    4.5.9 22-Bit Mode 41

    Figures

    1.1 LOGICAL TRACK FORMAT 4


    2.1 JUMPER LOCATIONS INDICATING FACTORY
    SET JUMPERS/ETCHES 8
    2-2 DRIVE/€ONTROLLER CABLING 19
    2-3 CONNECTOR PIN DEFINITIONS 20
    3-1 FORMAT SUBROUTINE 24
    3-2 WRITE DATA SUBROUTINES 25
    3-3 READ DATA SUBROUTINES 26

    Tables

    1-1 ADDRESS MARKS 5


    2-1 FACTORY SET PARAMETERS 7
    2-2 DEVICE/VECTOR ADDRESS JUMPERS 9
    2-3 PRIORITY LEVEL CONFIGURATIONS 9
    2-4 BOOTSTRAP CONFIGURATIONS 10
    2-5 WRITE PRECOMPENSATION CONFIGURATION 10
    2-6 WRITE CURRENT CONFIGURATIONS 11
    2-7 3ms STEP CONFIGURATION 11
    2-8 CONFIGURATIONS FOR SHUGART SASOO/80l 12
    2-9 CONFIGURATIONS FOR SHUGART SAS50/851 13
    2-10 CONFIGURATIONS FOR SHUGART 860 14
    2-11 CONFIGURATIONS FOR QUME (DATA TRAK 8) AND
    VE-DATA (YD-174) 15
    2-12 CONFIGURATION'S FOR QUl4E TRAK 242 16
    2-13 CONFIGURATIONS FOR MITSUBISHI M2896-63 17
    2-14 CONFIGURATIONS FOR TANDON 848 18
    3-1 DENSITY/SIDE COMMANDS 25
    Section 1 - General Information

    1.1 INTRODUCTION

    This manual provides the information needed to install and operate the
    Model DQ419 floppy disk controller manufactured by Distributed Logic
    Corp_, Anaheim, California. The controller supports one or two dual
    density, single or double sided floppy disk drives. The single dual-
    wide module is software and media compatible with the DEC* RXV21/ax02,
    and features an on-board bootstrap and diskette foraattina capability.

    The material in this manual is arranged into the following sections:

    Section 1 - GENERAL INFORMATION. This section contains a brief des-


    cription of the controller, its logical track format, recording scheme,
    and a list of specifications.

    Section 2 - INSTALLATION. This section explains the requirements and


    procedures for equipment installation. Alternate jumper selectable op-
    tions and cabling are described.

    Section 3 - OPERATION. This section explains the controller operation,


    including bootstrapping and formatting.

    Section 4 - PROGRA~mING. A description of the controller control re-


    gisters and programming features are presented to aid the user in
    programming the controller.

    *Registered trademark of Digital Equipment Corporation.


    Page 2

    1.2 GENERAL DESCRIPTION

    The controller is a dual densny floppy disk controller compatible with


    the DEC RXOI/~X02. When connected to a Shugart-type drive, it replaces
    the RXV21 subsystem. The controller provides either single density en-
    coding compatible with IBM 3740. devices, or double density encodi ng.
    The controller provides 512K bytes of storage on a single diskette.
    When two floppy drives are used, each drive may operate at a different
    density.
    The controller is a single dual-wide module that plugs directly into any
    standard Q bus* slot and interfaces through a 50-conductor ribbon cable
    to a Shugart compatible drive. The controller is factory preset for
    the standard device address 177170 and interrupt vector 264. The in-
    terrupt 1eve 1 is factory preset to 1eve 1 4. Alternate addresses and
    interrupt vectors are jumper selectable. Features include:

    Transparent firmware bootstrap that automotically boots


    double density diskettes (jumper selectable).
    Write precompensation to reduce bit shift for greater data
    integrity.
    Power fail protect to inhibit write sequence while the con-
    troller completes sector currently being written.
    Write current control for tracks greater than 43.
    Jumper selectable 4-1evel interrupt priorities compatible
    with LSI-II/23 or LSI-11/2.
    Supports 22-bit addressing with appropriate software changes.

    1.3 COMPATIBILITY

    The hardware, software and media compatibility with DEC's RXV21 system
    is provided to aid the user in data interchange with foreign systems.
    HARDWARE. The controller is compatible with the LSI-II, LSI-II/2 and
    [sl-11/23 CPUs. The single dual-wide module plugs directly into any
    standard LSI-II backplane. Alternate address selection and a 4-1evel
    device interrupt priority scheme allows expanded system configurations.
    Shugart 800/850-compatible drive logic is interfaced through a 50-pin
    ribbon connector.

    You might also like