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TUS8 . Dectape II TECHNICAL MANUAL EK-OTU58-TM-OOI

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TUS8 . Dectape II TECHNICAL MANUAL EK-OTU58-TM-OOI ~D~DllmD TUS8 . DECtape II TECHNICAL MANUAL EK-OTU58-TM-OOI TU58 DECtape II Technical Manual digital equipment corporation • maynard, massachusetts 1st Edition, September, 1979 Copyright © 1979 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 com­ puterized typesetting system. The following are trademarks of Digital Equipment Corporation, Maynard, Massachusetts: DIGITAL DECsystem-10 MASSBUS DEC DECSYSTEM-20 OMNIBUS PDP OIBOL OS/8 DECUS EDUSYSTEM RSTS UNIBUS VAX RSX DECtape VMS lAS DECtape II CONTENTS Page CHAPTER 1 INTRODUCTION 1.1 SCOPE ................................................................................................................ 1-1 1.2 GENERAL DESCRIPTION .................................................................... '" ........ 1-1 1.3 BLOCK DIAGRAM ........................................................................................... 1-3 1.3.1 Drive Control ............................................................................................... 1-5 1.3.2 Processor ...................................................................................................... 1-5 1.4 SPECIFICATIONS ............................................................................................. 1-5 1.4.1 Performance ................................................................................................. 1-5 1.4.2 Electrical ...................................................................................................... 1-6 1.4.3 Mechanical. .................................................................................................. 1-6 1.4.4 Environmental ............................................................................................. 1-8 1.5 CONFIGURATIONS ......................................................................................... 1-8 1.6 HARDWARE DOCUMENTATION ORDERING INFORMATION .............. 1-9 CHAPTER 2 OPERATION 2.1 TU58-CA RACKMOUNT CONTROLS AND INDICATORS .......................... 2-1 2,1.1 Front Panel .................................................................................................. 2-1 2.1.2 Run Indicator ............................................................................................... 2-1 2.1.3 Application and Removal of Power .............................................................. 2-1 2.2 TU58 COMPONENTS CONTROLS AND INDICATORS ................................ 2-2 2.2.1 Application and Removal of Power .............................................................. 2-2 2.3 CARTRIDGE ..................................................................................................... 2-2 2.3.1 Cartridge Loading ........................................................................................ 2-2 2.3.2 Cartridge Unloading .................................................................................... 2-3 2.3.3 Keeping Track of Cartridges ......................................................................... 2-3 2.3.4 Write Protect Tab ......................................................................................... 2-3 2.3.5 Cartridge Storage and Care .......................................................................... 2-3 2.4 MAINTENANCE ............................................................................................... 2-4 2.4.1 Head and Puck Cleaning ............................... : .............................................. 2-4 2.4.2 Operator Trouble Isolation ........................................................................... 2-4 2.4.3 Cartridge Wear ............................................................................................. 2-6 2.5 CARTRIDGE REPAIR ...................................................................................... 2-6 2.5.1 Metal-Base Cartridge Tape Rethreading Procedure ...................................... 2-6 2.5.2 Plastic-Base Cartridge Tape Rethreading Procedure ..................................... 2-8 2.5.2.1 Preparation for Threading .................................................................... 2-8 2.5.2.2 Threading the Cartridge ...................................................................... :2-8 2.5.2.3 Closing the Cartridge .......................................................................... 2-10 CHAPTER 3 PROGRAMMING 3.1 GENERAL PRINCIPLES .................................................................................. 3-1 3.1.1 Block Number, Byte Count, and Drive Number ........................................... 3-1 3.1.2 Special Handler Functions ............................................................................ 3-1 3.2 RADIAL SERIAL PROTOCOL (RSP) ............................................................... 3-1 3.2.1 Message Packets ........................................................................................... 3-1 3.2.2 Flag Byte Op Codes ...................................................................................... 3-2 3.2.3 Break and Initialization ................................................................................ 3-2 11l CONTENTS (Coot) Page 3.3 COMMAND SET ............................................................................................... 3-3 3.3.1 Command Packets ........................................................................................ 3-3 3.3.1.1 Maintenance Mode .............................................................................. 3-4 3.3.1.2 Special Address Mode .......................................................................... 3-5 3.3.2 Data Packets ................................................................................................ 3-5 3.3.3 End Packets .................................................................................................. 3-5 3.4 THE INSTRUCTION SET ................................................................................. 3-7 CHAPTER 4 INST ALLATION 4.1 INSTALLATION OF RACK VERSION ........................................................... .4- 1 4.1.1 Mounting in a Rack ..................................................... ro ••••••••••••••••••••••••••••••• 4-1 4.1.2 Power Selection for the Rack Version .......................................................... .4-3 4.1.3 Removing Module From Chassis ................................................................. .4-3 4.1.4 Reinstalling the Module ............................................................................... 4-5 4.2 DRIVE AND MODULE INSTALLATION ...................................................... .4-5 4.3 INTERFACE STANDARDS SELECTION AND SETUP ................................ .4-5 4.3.1 Selecting Interface Standards ....................................................................... .4-9 4.3.2 Connecting Standard Jumpers ..................................................................... .4-9 4.4 OPERATIONAL CHECKOUT ....................................................................... .4-11 4.4.1 Checkout of Interface ................................................................................. 4- 11 4.4.2 Checkout of RSP and Command Function ................................................ .4-12 CHAPTER 5 OPTIONS 5.1 RUN INDICATOR ............................................................................................. 5-1 5.1.1 Installation ................................................................................................... 5-1 5.2 BOOT SWiTCH .................................................................................................. 5-1 CHAPTER 6 TECHNICAL DESCRIPTION 6.1 BLOCK DIAGRAM ........................................................................................... 6-1 6.1.1 Data Flow, Tape to Interface ........................................................................ 6-1 6.1.2 Data Flow, Interface to Tape ........................................................................ 6- 1 6.1.3 Tape Motion Control ................................................................................... 6-5 6.2 VELOCITY CONTROL ..................................................................................... 6-5 6.2.1 Velocity Sensing ........................................................................................... 6-5 6.2.2 Velocity Servo .............................................................................................. 6-5 6.2.3 Velocity Change ........................................................................................... 6-5 6.2.4 Drive Selection and Direction Change .......................................................... 6-5 6.2.5 Microprocessor Velocity Control .................................................................. 6-8 6.2.6 Run Timeout ................................................................................................ 6-9 6.2.7 Motor Overcurrent Drive Limit. ................................................................... 6-9 6,2,8 Transient Suppression .................................................................................. 6-9 6.3 HEAD SELECTION ........................................................................................... 6-9 6.4 WRITE CIRCUIT AND INTERLOCK .............................................................. 6-9 6.5 ERASE CIRCUIT ............................................................................................
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