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Tandy 1000 SL Technical Reference Manual

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- Table of Contents
- Introduction
  - General Description
  - Specifications Summary
    
    Optional Features
- System Assembly/Disassembly (Including Exploded Views)
- 4 . Main L O G I C B O a R D
  - Introduction
  - Switch Settings and Jumper Pin Configurations
  - Theory of Operation
    
    8086 Microprocessor
    
    8087 Numerical Math Coprocessor
    
    Clock Generation
    
    Command and Control Signal Generation
    
    DRAM Control
    
    Refresh Control
    
    BIOS ROM Control
    
    Reset Circuit
    
    Wait State and Ready Logic
    
    NMI Logic 1
    
    8087 Control Logic
    
    Data Buffers and Conversion Logic
    
    1/0 Decode
    
    Floppy Disk Controller
    
    Video Controller
    
    Timer
    
    Joystick Interface
    
    Keyboard Interface
    
    Sound Circuit
    
    Additional Sound Features (DAC)
    
    DMA Controller
    
    Parallel Printer Port Interface
    
    Expansion Ports
    
    System Expansion Bus
    
    Expansion Bus Signal Description
    
    Memory Map
    
    1/0 Port Map of System
    
    1/0 Port Map Summary
  - Buffer Blue Preliminary Specification
  - 1 . 0 General
  - Pin List
  - Absolute Maximum Ratings
  - Electrical Characteristics Ac Characteristics
  - 1 . 0 General
  - Pin List
    
    I N P U T S
    
    Strobe
    
    Sint
    
    Iodo - Iod7
  - Ac Characteristics
    
    Minimum W a I T S T a T E G E N E R a T I O N
    
    P O R T C4 Read
    
    P O R T C
    
    Write
    
    P O R T C5 Read
    
    P O R T C6 R
    
    P O R T C7 R
    
    P O R
    
    C L E a R J O y S T I C K DAC C O U N T E
    
    P O R
    
    J O y S T I C K Status
    
    P L a N a R C O N T R O
    
    T I T L E P a G E
    
    Section 2 Theory of Operation
    
    Construction and Function
    
    G E N E R a L B L O C K Diagram
    
    Mechanical S E C T I O N
    
    Circuit Descriptions
    
    Read Write C I R C U I T
    
    Mode S E L E C T O R
    
    Read C I R C U I T
  - Write C I R C U I T
  - Low V O L T a G E S E N S O R
  - F U N C T I O N a N D O P E R a T I N G Waveform of
  - Control C I R C U I T
  - Head Load C O N T R O L C I R C U I T
  - Write/Erase C O N T R O L C I R C U I T
  - Ready D E T E C T O R
  - Stepping Motor C O N T R O L C I R C U I T
  - T R a C K C O U N T E
  - RD/INDEX G a T E
  - Door-Close C I R C U I T
  - O T H E R T E R M I N a L S a N D F U N C T I O N O F C O N T R O L LSI
  - 2-2-3. S E R V O C I R C U I T
  - Function of T E S T P O I N T S
  - F U N C T I O N of Variable Resistors
  - 3-1. General
  - P E R I O D I C M a I N T E N a N C
  - 3-1-2. Check and Adjustment
  - Equipments
  - 3-1-3-2. Tools, Jigs, and Disks
  - Precautions
  - T O R Q U E Applied T O S C R E W S a N D L O C K I N G P a I N
  - H a N D L I N G O F C O N N E C T O R S
  - L O C a T I O N O F C O N N E C T O R S
  - 3-2-2-3. Precautions for White Connectors, J6 and Jll
  - Head Cable Treatment
  - Ska
  - Cable C O N N E C T I O N a N D S E T T I N G O F Power
  - Level Disk Calibration
  - A L I G N M E N T D I S K C a L I B R a T I O
  - 3-2-4-6. Humidity S E T T I N G
  - Gain Setting
  - Setting O F FDD Straps and SKA Special Key
  - Others
  - 3-3-1. Cleaning O F Magnetic Head by C L E a N I N G Disk
  - Check and Adjustment
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