User Manuals: DEC DECtape 551 Storage Device

Manuals and User Guides for DEC DECtape 551 Storage Device. We have 1 DEC DECtape 551 Storage Device manual available for free PDF download: Manual

DEC DECtape 551 Manual

DEC DECtape 551 Manual (79 pages)

Brand: DEC | Category: Storage | Size: 3 MB

Table of Contents

Table of Contents
1
Introduction and Description
7
Purpose of Equipment
7
Functional Description
7
Physical Description
8
- Physical Specifications
  9
Electrical Description
9
Pertinent Documents
10
2 System Description

11
- Data Control Type 136
  11
- Dectape Control Type 551
  12
- DEC Tape Transport Type 555
  12
- Recording Format
  12
  - Manchester Recording
    13
- Placement of Dectape Tracks
  13
  - Redundant Recording
    14
  - Mark Track Format
    14
  - Block Format
    15
    
    Block Mark, Block-Mark Space, Block-Mark End
    15
    
    Data Sync
    17
    
    Reverse Data-End Mark
    17
    
    Data Mark
    18
    
    Forward Data-End Mark
    18
    
    Block-Mark Sync
    18
    
    Reverse Block Mark
    19
    
    Reverse and Forward End Marks
    19
  - Reg Isters of the Type 551
    19
    
    Control Register
    19
- Dectape Control Type 551 Block Diagram
  20
  - Status Register
    22
  - Read-Write Buffer
    23
  - Mark Track Window
    23
  - Error Check Register
    23
  - Block Mark Timing Register
    24
  - Data Timing Register
    24
3 Theory of Operation

25
- Block Schematic Discussion
  25
  - Initial Ization Operations
    25
  - Command Decoding
    27
  - Functions
    28
  - Write Block Mark Operation
    29
  - Write Data Operations
    32
  - Write All Operation
    35
  - Read Operations
    35
  - Write Timing and Mark Track
    37
  - Operation
    37
  - Automatic Error Checking
    38
  - Status Checking Operations
    41
  - Program Interrupt Operations
    41
- Circuit Discussion
  42
4 Interface

47
- Interface Signals from I/O Bus
  47
- Interface Signals to I/O Bus
  48
- Interface Signals from Type 555 Tape Transports
  50
- Interface Signals to Type 555 Tape Transports
  51
- Interface Signals from Data Control 136
  51
- Interface Signals to Data Control 136
  52
- Maintenance Equipment
  55
- Type 4304 Delay Control Check
  59
- Type 4401 Variable Clock Check
  60
- Type 4523 Manchester Reader/Writer Check
  60
- Read/Write Circuitry Check
  62
- Timing Checks
  65
- Corrective Maintenance
  65
- Preliminary Investigation
  66
- System Troubleshooting
  66
- Dectape Control Troubleshooting
  66
- Spare Parts Program
  67
- Semiconductor Spares
  68
- Pulse Transformer Spares
  69
- Circuit Troubleshooting
  70
- Validation Test
  72
- Log Entry
  73

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