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Ampex Manuals
Touch terminals
219
Service manual
Ampex 219 Service Manual
Video display terminals
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Contents
Table of Contents
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Table of Contents
Table of Contents
1 Purpose and Scope
General Description
Overview
References
Ampex 230/219 Video Display Terminal
Ampex 230 Specifications
Ampex 219 Specifications
Installation
Introduction
2 Serial Port Interfaces
Primary Port Interface
Printer Port Interface
Printer Port Pin Signal Assignments
Installation Requirements
Space Allocation
User-Installable Options
Overall Dimensions
Input Power
Input Power Requirements
Voltage Strapping Plug (Versions 1 and 2)
AC Power Cord and Plug
Interface Cable Connections
Keyboard Port Connection
Keyboard Port on Display Terminal
Power-On and Reset
Self-Test
General Description
3 Introduction
Operation and Components of the Terminal Controller PWBA
Theory of Operation
Terminal Basic Block Diagram
Controller PWBA Block Diagram
Input/Output Mapping and the CPU
Communication I/O
Keyboard I/O
Central Processing Unit
Functions of the CPU
Buses Used for Interfacing
3.3.2.3 Memory Interfaces
Display I/O
Program Instruction Memory Configurations
Operation of CPU Memory
Program ROM/PROM
3.3.3.2 Data RAM
Attribute Delimiter Bits
Video PWBA Block Diagram
General Information
Operation of Display Circuitry
Operation of the PVTC Chip
PVTC Chip Initialization Register Selection
Initialization Register Parameters
Valid Address/Blanking and Sync Signals Relationship
Horizontal Sync
Vertical Sync
Cursor Signal
Character Generation
Generation of Video Signals
Basic Video
Attribute Control Signals
Operation of the Display RAM
Driver-Receiver Operation
Primary Port - RS232C Interface
Primary Port - Current Loop Interface (Option)
Operation of Serial Interface Circuitry
RS232C Pin Signal Assignments
Primary Port - RS422 (Option)
Printer Port
Operation of Bus Interface Chip
Current Loop Pin Signal Assignments
RS422 Pin Signal Assignments
4 Introduction
Maintenancj
Test Equipment
Performance Testing
Power on Self Test
Test Pattern
Bad Component Error Messages
Keyboard Test
Video Adjustments
Brightness
Horizontal Size
Vertical Linearity
Dimensions of E Character
Interconnection Diagram
Video Waveform
Vertical Sync Waveform
Horizontal Sync Waveform
Vertical Deflection Waveform
Horizontal Deflection Waveform
Subassembly and Parts List
Subassembly Location Diagram
Removing the Display Cover
Removing the Pedestal Cover
Discharging the CRT
Table
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AMPEX 230/219
VIDEO DISPLAY TERMINALS
SERVICE MANUAL
3515021-01
JUNE 1985
AMPEX MEMORY PRODUCTS DIVISION
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230
230 plus
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