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Dick Smith Manuals
Desktop
System 80
Technical manual
Dick Smith System 80 Technical Manual
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Also See for System 80
:
User manual
(24 pages)
,
Owner's manual
(38 pages)
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Theory of Operation
System Block Diagram
Cpu
Clock
Reset
Buses
Address Decode
Memory Map
I/O Port Assignment
Rom
Ram
Generation of RAS, MUX and cas
RAS, MUX and cas
Memory Read/Write
RAM Refresh
Video Interface
Block Diagram of the Video Interface
Horizontal and Vertical Sync Signals
Divider Chain of the Video Display
Video Memory
Video RAM Interfacing
Video RAM Addressing
Video Signal Generation
Video Display Timing of a Character
Video Display Timing of a Line
Composite Video Signal
Equivalent Circuit of Video Mixer
Display Modes
Character Mode
Graphic Mode
Character/Graphic Display Format
Cassette Interface
Addressing/Decode
Cassette I/O Port
Cassette Selection
Cassette Write
Cassette Write Signals
Cassette Read
Cassette Read Signals
Sound Output
Sound Circuit
Keyboard
Key Matrix
Numeric Keypad
Power Supply
Specifications for the Output Voltages
RS-232C Interface
Minor Modifications
External Cassette Recorder Connection
Length of BASIC Statement Lines
Key Top Legends
VAL String Functions
Differences between TRS-80 and System 80
Printer Interface
Serial Interface
Keyboard Differences
Video Display of "Arrow" Keys
System 80 Video Display Codes
Graphics Codes
Space Compression Codes
Alphanumeric Codes
Control Codes
System 80 Memory Map and I/O Map
Hex-To-Decimal Conversion Chart
Troubleshooting
Bus Check - Data, Address and Control Buses
Tester Circuit Diagram
General Flowchart in Troubleshooting
Interface Board
System ROM
CPU Board
User RAM
Troubleshooting Hints
Keyboard Malfunctions
Keyboard Has Bounce
Keyboard Not Operating
Video Absent or Irregular
Picture Position Adjustment
Cassette Mechanism Not Working
Modifications to Improve Cassette Reliability
Cassette Loading Difficulties
Cassette Loading Intermittent
Programs Being Corrupted
Circuit Schematics and Board Layouts
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Table of Contents
Troubleshooting
Troubleshooting
47
General flowchart in troubleshooting
49
Troubleshooting hints
57
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