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PYTHON 4322
Product description manual
Archive PYTHON 4322 Product Description Manual
Dds-dc data compression dat tape drives, 3.50/5.25-lnch, internal tape drive, external subsystem
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Contents
Table of Contents
Bookmarks
Table of Contents
Table of Contents
Preface
Chapter 1. Introduction
Overview
Data Compression
Figure 1-1 Python 4322 OAT Drive
Figure 1-4 SCSI System Sample Configurations
Flash EEPROM
Software
About this Manual
Table 1-2. Chapter Descriptions
Chapter 2. Specifications
Overview
Physical Specifications
Figure 2-3 Python 4352 External Subsystem General Dimensions
Power Specifications
Table 2-3. Power Connector Pin Assignments (Models 4322 and 4542)
Table 2-4. Power Specifications for the Python 4352 Drives
Drive Performance Specifications
Environmental Requirements
OAT Cassette Specifications
Table 2-6. Environmental Specifications: Python DDS-DC Drives
Regulatory Compliance
Chapter 3. Installation
Introduction
Guidelines and Cautions (4322 and 4542 Internal Models)
Unpacking and Inspection
Cabling and Connectors
Cabling Considerations
Electrical Characteristics
Single-Ended SCSI Connector
Table 3-1. Single-Ended SCSI Connector Pin Assignments: Models 4322 and 4542
Installing the Python 4322 and 4542 Internal Drives
Table 3-2. Single-Ended SCSI Connector Pin Assignments: Model 4352
Figure 3-1 Python 4322 Switchbank Access
Setting Operational Switches
Figure 3-4. SCSI Device Address Selection (4322 and 4542)
Figure 3-5 JP6 External SCSI Address Port
Mounting the Drive Unit
Figure 3-6. Mounting Hole Locations (4322)
Figure 3-7. Mounting Hole Locations (4542)
Completing Connections
Figure 3-8. Power and SCSI Connectors
Installing the Python 4352 External Drive
Figure 3-9. Power and SCSI Connectors
Completing the Interface Connection
Figure 3-10 Python 4352 Rear Panel
Selecting the SCSI Address
Connecting the Power Cord
Figure 3-11 Daisy Chain Diagram
Chapter 4. Drive Operation
Introduction
Data Compression Operation
Front Panel LED Operation
Figure 4-1. Python 4322 Front Panel
Figure 4-2. Python 4542 Front Panel
Figure 4-3. Python 4352 Front Panel
Table 4-1. LED Summary
Loading/Unloading the Cassette
Loadinglunloading a Cassette (Normal Operation)
Figure 4-4 Cassette Loading (4322 OAT Drive)
Unloading a Cassette (Manual Operation)
Figure 4-5. Manually Removing a Cassette
Figure 4-6. Manually Removing a Cassette
Using a Blank Cassette
Figure 4-7. Manually Removing a Cassette
Using a Cassette Containing Data
Using a Prerecorded Audio Cassette
Loading Revised Firmware Via Archive Firmware Cassette
Chapter S. SCSI Interface
Introduction
SCSI-1 Interface
ANSI X3.131 Conformance Statement (SCSI-I)
SCSI-2 Interface
ANSI X3T9.2 Conformance Statement (SCSI-2) (Working Draft, Rev 10)
Chapter 6. Tape Formats
Introduction
DDS Format
DDS-DC Format
Commonalities between the Formats
Entities (DDS-DC Format Only)
Tape Layout
Single Data Space Layout
Device Area
Reference and System Area
Figure 6-1 Single Data Space Tape Layout
Figure 6-2 Reference and System Area Layout
Data Area
End-Of-Data (EOD) Area
Two-Partition Layout
Data Storage Organization
Figure 6-3 Two-Partition Tape Layout
Individual Track Layout
Main Area
Figure 6-4 Individual Track Layout
Subareas
Group Structure
Figure 6-5 Group Structure
Data Frames
ECC Frame
Index
Amble Frames
Indexing
Group Information Table (GIT)
Block Access Table (BAT)
Vendor Group
Read-After,Write
Chapter 7. Data Compression
Introduction
Data Compression Considerations
DCLZ Algorithm
Hardware Compression
Data Integrity
DCLZ Algorithm
Simplified Compression Operation
Table 7-1. Simplified Compression
Dictionary
Simplified Decompression Operation
Table 7-2. Simplified Decompression
AHA3101 Data Compression Chip
Chapter 8. Theory of Operation
Block Diagrams
Python DDS-DC DAT Drives
Figure 8-2 Block Diagram -- SCSI Controller Python Models 4322NT and 4542NT DDS-DC Drives
Figure 8-3 Block Diagram -- SCSI Controller Python Models 4322NP, 4542NP, and 4352XP DDS-DC Drives
Figure 8-4 Python State Diagram
Figure 8-5 Four-Head Design
Helical Scan Recording -- Four-Head Design
Figure 8-6 Alternate Azimuth Angles
Motors and Control Circuits
Audio Output Jack
Flash EEPROM
Sensors
Figure 8-7 OAT Cassette
Figure 8-8. Cassette Design Features
Table 8-1. Tape Lengths and Capacities
Chapter 9. Maintenance and Reliability
Maintenance
Head Cleaning
Automatic Drive Spin-Down and Write
Guidelines for High Temperature or Humidity Conditions
Reliability
Mean-Time-Between-Failure
Mean-Time-To-Repair
Table 9-1. Reliability Specifications
Appendix Aglossary of Terms
Appendix B. Acronyms and Measurements
Measurements
Appendix Cdata Compression
Introduction
MODE SELECT Page
Table C-1. Data Compression MODE SELECT Page
Compression Control
Decompression Control
Table C-2. DDE and RED Bit Configurations
MODE SENSE Page
Table C-3. Algorithms
Table C-4. Data Compression MODE SENSE Page
Compression Control
Decompression Control
Compression Algorithm
Decompression Algorithm
Request Sense Data
Implementation Notes
Table C-6. Sense Data Values and Descriptions
C.S.2 SCSI Command Operation for Noncompressing Modes
WRITE DATA BUFFER (3Bh)
C.6.L WRITE DATA BUFFER Command Descriptor Block
Table C-7. Command Descriptor Block: WRITE DATA BUFFER
Command Descriptor Block Field Descriptions
WRITE DATA BUFFER Data Header
Table C-8. Field Descriptions: WRITE DATA BUFFER Command Descriptor Block
Completion Status
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PYTHONTM
DDS-DC DATA COMPRESSION
DAT TAPE DRIVES
Model: 4322 (3.50-lnch, Internal Tape Drive)
4542 (5.25-lnch, Internal Tape Drive)
4352 (External Subsystem)
PRODUCT DESCRIPTION MANUAL
January 1992
ARc
·
CORPO~J!~E:------------------------~
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This manual is also suitable for:
Python 4542
Python 4352
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