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950
Maintenance manual
TeleVideo 950 Maintenance Manual
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Also See for 950
:
Operator's manual
(44 pages)
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
List of Tables
Introduction
Terminal Overview
Options
Symbols
Commands
Control Commands
Entering Commands
Terminology
Installation
Unpacking
Location of Screws in Cabinet
Preparing the Site
Power Requirements
Physical Requirements
Connecting the Keyboard
Power Configuration
Connecting the Terminal to a Computer System or Modem
Rear View of Terminal
P3 Pin Connector Assignments
Logic Board
Connecting the Terminal to a Printer
Terminal Interior
Configuring the Terminal for the Computer and Printer
Baud Rates
Switch Settings
External Switch Settings
Switch S1 Settings for Baud Rates
Switch S2 Settings for Parity
Plugging the Terminal in
Switch S2 Settings for Communication Mode
A Typical S2 Switch Setting
Installation Checklist
Field Modifications
Composite Video Option
Additional Pages of Screen Memory
Notches and Depressions in Chips
Operation
Turning on the Terminal
Rear Panel
Keyboard Controls
Character Keys
Special Keys
Keyboard Layout
Function of Keys
Cursor
Setting up the Terminal
Editing
Status Line Fields
Communicating with the Computer
Local Mode
Communications Flow
Block Mode
Half Duplex
Full Duplex
Printing
Programming
Monitor Mode
User and Status Lines
To Load the User Line with Data
Video Attributes and Monitor Mode
Monitor Mode Control Characters
Status Line
Line Lock
Cursor Coordinates
Disabling/Enabling the Keyboard
Cursor Display
Keyclick and Bell
Smooth Scroll
Video Display
Visual Attributes
Reverse Video
Half Intensity
Underline
Blink
Setting Visual Attributes
Special Graphics
Additional Screen Memory
Special Graphics Characters
Auto Page
Protect Mode
Application
Effect
Input
Protection
Normal and Reverse Linefeed
Cursor Control Codes
The Function Keys
Default Messages
Programming the Function Keys
Default Function Key Values
Using Function Keys
The Funct Key
Addressing and Reading the Cursor Position
Loading an Insert Character
Tab Programming
Communication Modes
Local
Block
Edit Keys
Conversation
Duplex Edit
Editing Text
Edit and Insert Modes
Page Edit
Line Edit
Insert Line
Insert Page
Editing Commands
Clear Function
X-ON/X-OFF Control
Data Terminal Ready Control
User ROM
Computer Port Programming
Baud Rate Values
Parity Values
Word Length Values
Printer Port Programming
Send Function
Programing the SEND Key
Delimiter Programming
Data Transmission Commands
Print Function Programming
Transmit Commands
Print Modes
Transparent Mode
Print Controls
Troubleshooting and Service
Care
Preventive Maintenance and Care
Testing the Terminal
Testing the Computer and Printer Port Communicatinos
Repair
Changing the Line Fuse
Changing the Power Supply Fuses
Technical Assistance
Vital Statistics
Model 950 Specifications
ASCII Code Chart
Abbreviations for Control Characters
Index
Quick Reference Guide
Theory of Operation
Main Logic Board
Overview
CPU Timing and Control
CPU, Timing and Control
Display Controller
Video and Character Generation
Input/Output Circuits
I/O Circuits
Keyboard
Standard Keyboard
Keyboard X-Y Matrix Arrangement
Keyboard Interface
Keyboard Scanning Method
Ports
Data Bus
Basic Scan Routine
Gate Array Logic Board
R6500 Microprocessors
Microprocessor Concept
Features
Signal Description
Ready
Interrupt Request
Set Overflow Flag
Addressing Modes
Alphabetic Sequence
Accumulator Addressing
Absolute Addressing
Pin Package
Instruction Set
Clock Timing
Timing for Reading Data from Memory or Peripherals
Programming Model
Internal Architecture
Versatile Interface Adapter
Operation Summary
Timing Characteristics
Write Timing Characteristics
I/O Timing Characteristics
Function Control
Operating Modes
Peripheral Control Register
Auxiliary Control Register
Shift Register Control
T2 Control
CRT Controller
Interface Signal Description
CPU Interface
Lpen
Refresh RAM and Character ROM Interface
Internal Register Organization
Internal Register Description
Status Register
Address Register
Horizontal Total Character
Horizontal Sync Position
Horizontal and Vertical Sync Widths
Vertical Sync Position
Description of Operation
Refresh RAM Addressing
Row/Column
Binary
Use of Dynamic RAM for Refresh Memory
Cursor Operation
MPU Write Timing Characteristics
Write Cycle
MPU Read Timing Characteristics
Read Cycle
Memory and Video Interface Characteristics
System Timing Definitions
Light Pen Strobe Timing Definitions
Specifications
Maximum Ratings
Electrical Characteristics
Test Load
Asynchronous Communication Interface Adapter
Pin Configuration
Interface Diagram
Internal Organization
Transmitter/Receiver
Control Register
Command Register
Read/Write Cycle Characteristics
Transmit/Receive Characteristics
Package Outlines
HMOS Single Component 8-Bit Microcopmuter
A.C. Characteristics
Port 2 Timing
Bus Timing as a Function of TCY
Waveforms
PCB Assembly Control Board
PCB Assembly Control Board Gate Array
Video Monitor/Power Supply Schematics and Parts List
Video Monitor
Power Supply
Tube Specification
Display Tube
Electrical Data
Optical Data
Mechanical Data
General Considerations
Warning
Video Monitor Module
Power Supply Module
TR Waveform and Voltage
PCB Assembly Video Monitor
PCB Assembly Power Supply
Terminal Troubleshooting Guide
Overview of Terminal Modules
Discharging Voltages
Functional Description of Modules
Troubleshooting the Logic Board
Visual Inspection
To Remove the Logic Board
Large Scale Integration Failures
Data Line Operation
Debugging Tables
Troubleshooting the Video Monitor
Troubleshooting the Power Supply
Eliminating Loss of Video by Upgrading the Power Supply
Parts Required
Eliminating Missing Character Dots on 950 Terminals
Location of Additional Capacitor
Revised Schematic
Installing the Current Loop Feature
Configuration
Location of Jumpers on Current Loop Board
Current Loop Board in Socket
Jumper Options and Port Connectors
Logic Board Jumpers
Increasing the Size of the 950 System ROM
How to Tell a TTL Logic Board from a Gate Array Logic Board
Testing the 6502 Address Line
Operation of Test Assembly
Wire Wrap Socket
Expected Wave Forms
Enabling the DTR Line on 950 Terminals
Related Failures
Plus Gate Array Chip
Repairs Price List
Terminal Maintenance Training Class
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See also:
Operator's Manual
Table of
Contents
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Table of Contents
Troubleshooting
Troubleshooting and service
91
Terminal troubleshooting guide
204
Troubleshooting the logic board
208
Troubleshooting the video monitor
228
Troubleshooting the power supply
235
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