VT220 Technical Manual

Company:Digital Equipment Corporation
Part:EK-VT220-TM-001
Date:1984-11
Keywords:terminal

Table of Contents

  • Chapter 1 System Introduction
    • 1.1 General
    • 1.2 Physical Description
      • 1.2.1 Monitor Assembly (VT220)
      • 1.2.2 Keyboard (LK201)
      • 1.2.3 Modem Module Option (VT22X-AA)
    • 1.3 Display Characteristics and Capabilities
    • 1.4 Communication Environment
    • 1.5 Major Operating States
    • 1.6 Operating Modes
      • 1.6.1 VT100 Mode
      • 1.6.2 VT200 Mode, 7-Bit Controls
      • 1.6.3 VT200 Mode, 8-Bit Controls
      • 1.6.4 VT52 Mode
  • Chapter 2 Controls, Indicators, and Connectors
    • 2.1 General
    • 2.2 Monitor Assembly (VT220)
    • 2.3 Keyboard (LK201)
      • 2.3.1 Main Keypad
      • 2.3.2 Editing Keypad
      • 2.3.3 Auxiliary Keypad
      • 2.3.4 Top-Row Function Keys
      • 2.3.5 Visual Indicators
      • 2.3.6 Audible Indicators
        • 2.3.6.1 Audible Keyclick
        • 2.3.6.2 Bell
      • 2.3.7 Connector Cable
    • 2.4 Modem Option (VT22X-AA)
  • Chapter 3 System Overview
    • 3.1 General
    • 3.2 Operating States
      • 3.2.1 Set-Up
      • 3.2.2 Local
      • 3.2.3 On-Line
    • 3.3 System Architecture
      • 3.3.1 CPU Logic
      • 3.3.2 Video Logic
      • 3.3.3 System Communication Logic
      • 3.3.4 Modem Option (VT22X-AA)
      • 3.3.5 Power Supply
      • 3.3.6 Keyboard
      • 3.3.7 Monitor Components
    • 3.4 System Interaction
  • Chapter 4 CPU Logic
    • 4.1 General
    • 4.2 Major Circuits and Components
      • 4.2.1 Central Processor Unit (CPU)
        • 4.2.1.1 8051 CPU Internal Circuits
        • 4.2.1.2 8051 CPU Transactions
      • 4.2.2 Address Latch
      • 4.2.3 Read Only Memory (ROM)
      • 4.2.4 Data Buffer
      • 4.2.5 Screen RAM
      • 4.2.6 Attribute RAM
      • 4.2.7 Select Decoder
      • 4.2.8 Keyboard Interface (I/F)
      • 4.2.9 Nonvolatile RAM (NVR)
      • 4.2.10 Configuration Register
    • 4.3 Signal Descriptions
    • 4.4 Schematic Reference Information
  • Chapter 5 System Communication Logic
    • 5.1 General
    • 5.2 Major Circuits and Components
      • 5.2.1 Dual Asynchronous Receiver/Transmitter (DUART)
        • 5.2.1.1 2681 DUART Internal Circuits
        • 5.2.1.2 2681 DUART Addresses
        • 5.2.1.3 2681 DUART Timing Diagrams
      • 5.2.2 Host Data Mux
      • 5.2.3 Printer Interface (I/F)
      • 5.2.4 EIA Host Interface (I/F)
      • 5.2.5 20 mA Interface (I/F)
    • 5.3 Signal Descriptions
    • 5.4 Schematic Reference Information
  • Chapter 6 Video Logic
    • 6.1 General
    • 6.2 Major Circuits and Components
      • 6.2.1 CRT Controller
        • 6.2.1.1 9007 VPAC Internal Circuits
        • 6.2.1.2 9007 VPAC Addresses
        • 6.2.1.3 9007 VPAC Transactions
      • 6.2.2 Timing Generator
      • 6.2.3 Blank Circuits
      • 6.2.4 Character Generator
        • 6.2.4.1 Access Mux
        • 6.2.4.2 Line Buffer
        • 6.2.4.3 Character Output Circuit
      • 6.2.5 Attribute Circuits
      • 6.2.6 Video Converter
        • 6.2.6.1 Conversion Control
        • 6.2.6.2 Parallel-to-Serial (P/S) Converter
      • 6.2.7 Video Output
    • 6.3 Signal Descriptions
    • 6.4 Schematic Reference Information
  • Chapter 7 Keyboard (LK201)
    • 7.1 Introduction
    • 7.2 Physical Description
    • 7.3 Functional Description
      • 7.3.1 Keyboard Operation Overview
        • 7.3.1.1 Keyboard Scanning
        • 7.3.1.2 Controls of Audio Transducer and Indicators
      • 7.3.2 Keyboard Firmware Functions
        • 7.3.2.1 Functions Not Changed By CPU Instructions
        • 7.3.2.2 Functions Changed By CPU Instructions
        • 7.3.2.3 Firmware Functions Changed By CPU Instructions
    • 7.4 Detailed Keyboard Circuit Description
      • 7.4.1 Keyboard Matrix Scanning
      • 7.4.2 Audio Transducer Control Circuit
      • 7.4.3 Indicator (LED) Control Circuit
      • 7.4.4 Keyboard Communication
        • 7.4.4.1 Keyboard Transmit Mode
        • 7.4.4.2 Keyboard Receive Mode
      • 7.4.5 Reset Signal for 8051 Microprocessor
      • 7.4.6 Hardware Keyboard Identification (ID)
      • 7.4.7 Voltage Supplies
    • 7.5 Keyboard Programming
      • 7.5.1 Keyboard Layout and Key Identification
      • 7.5.2 Modes
        • 7.5.2.1 Special Considerations Regarding Autorepeat
        • 7.5.2.2 Special Considerations Regarding Down/Up Mode
        • 7.5.2.3 Autorepeat Rates
      • 7.5.3 Keyboard Peripherals
        • 7.5.3.1 Audio
        • 7.5.3.2 Indicators (LEDs)
      • 7.5.4 Keyboard-to-System Module Protocol
        • 7.5.4.1 Keycode Transmission
        • 7.5.4.2 Special Code Transmissions
        • 7.5.4.3 Power-Up Transmission
      • 7.5.5 System Module to Keyboard Protocol
        • 7.5.5.1 Commands
        • 7.5.5.2 Parameters
        • 7.5.5.3 Peripheral Commands
        • 7.5.5.4 Mode Set Commands
      • 7.5.6 Special Considerations
        • 7.5.6.1 Error Handling
        • 7.5.6.2 Keyboard Locked Condition
        • 7.5.6.3 Reserved Code
        • 7.5.6.4 Test Mode
        • 7.5.6.5 Future Expansion
      • 7.5.7 Default Conditions
        • 7.5.7.1 Audio Volume
    • 7.6 Specifications
  • Chapter 8 Monitor Circuits
    • 8.1 General
    • 8.2 Major Circuits and Components
      • 8.2.1 Video Amplifier (Amp) Circuit
      • 8.2.2 Horizontal Deflection Circuit
        • 8.2.2.1 Horizontal Processor Circuit
        • 8.2.2.2 Horizontal Driver Circuit
        • 8.2.2.3 Horizontal Output Circuit
      • 8.2.3 Flyback Transformer Circuit
      • 8.2.4 Vertical Deflection Circuit
        • 8.2.4.1 Vertical Processor Circuit
        • 8.2.4.2 Vertical Output Circuit
      • 8.2.5 Dynamic Focus
      • 8.2.6 Brightness Control
      • 8.2.7 CRT Device
  • Chapter 9 Power Supply
    • 9.1 General
    • 9.2 Major Circuits and Components
      • 9.2.1 AC Input Components
      • 9.2.2 AC Conversion Circuits
        • 9.2.2.1 +12 V Start Up Circuit
        • 9.2.2.2 Input Rectification Circuit
        • 9.2.2.3 DC Output Circuits
        • 9.2.2.4 Overcurrent Protect Circuit
        • 9.2.2.5 Pulse Width Modulator Circuit
      • 9.2.3 DC OK Circuit
      • 9.2.4 DC Input Components
  • Appendix A Specifications
  • Appendix B VT220/VT102 Differences
  • Appendix C Register Bit Values

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