Radio Shack TRS-80 III Manuals

Manuals and User Guides for Radio Shack TRS-80 III. We have 9 Radio Shack TRS-80 III manuals available for free PDF download: Operation And Reference Manual, Owner's Manual, Service Manual, Operation Manual

Radio Shack TRS-80 III Operation And Reference Manual (276 pages)

Operation and reference manual

Brand: Radio Shack | Category: Desktop | Size: 18.24 MB

Basic Language Section

7
- Table of Contents
  7
- Arithmetic Functions
  7
  - Input/Output Statements
    7
  - Program Statements
    7
- Rs-232-C
  16
- BASIC Language Section
  45
  - RAM Addresses
    69
  - Memory Map
    91
    
    ROM Addresses
    92
  - Parallel Printer Interface
    100
  - Cassette Jack Pin
    101
  - Printer Pin Location
    101
- BASIC Concepts
  105
  - Numeric Operators
    123
  - Numeric Relations
    127
  - String Relations
    127
  - Character Codes
    175
  - Error Codes
    197
- Commands
  217
  - Graphic
    225
    
    Special Functions
    228
- Error Codes
  233
- Model I to Model III Program Conversion Hints
  255
- Glossary
  257
- RS-232-C Technical Information
  261
  - Field Specifiers
    266
  - Keyword Codes
    267
    
    Space Compression
    269
  - Rs-232-C
    269
    
    Reserved Words
    269
Figures and Tables

270

Radio Shack TRS-80 III Service Manual (135 pages)

Brand: Radio Shack | Category: Desktop | Size: 14.02 MB

Table of Contents
3
List of Illustrations
5
List of Tables
7
Introduction
9
System Overview
11
TRS-80 Model III Block Diagram
12
Disassembly/Reassembly
13
Disassembly
15
Case
15
CPU Board
15
FDC Board
15
Video Monitor (CRT) and Video Board
16
Reassembly
17
RS-232 Board
17
Main Power Supply
17
Disk Drive
17
CPU Circuit Board
19
Technical Description
21
Video SYNC Circuits
21
Processor
21
Ram
21
Address Decoding
22
Memory Map of Model III
22
IO Port Description
23
Video
24
Video Timing Diagram
24
Keyboard
25
Cassette Interface
25
Adjustments and Jumper Positions
26
Line Printer and Real Time Clock
26
IO Bus
26
Model III IO Bus
27
Input or Output Cycles
28
Input or Output Cycles with Wait States
28
IO Bus Timing Diagrams
28
Model III Port Bits
29
CPU Printed Circuit Board - Component Side
31
CPU Printed Circuit Board - Circuit Side
32
CPU Module Parts List
33
Model III CPU Schematic Diagram - Video and Horizontal Sync Circuits
39
Model III CPU Schematic Diagram - Processor Section
40
Model III CPU Schematic Diagram - RAM Section
41
Model III CPU Schematic Diagram - Address Decoding Section
42
Model III CPU Schematic Diagram - Video Section
43
Model III CPU Schematic Diagram - Keyboard Section
44
Model III CPU Schematic Diagram - Cassette Interface Section
45
Model III CPU Schematic Diagram - Line Printer and Real Time Clock Section
46
Model III CPU Schematic Diagram - I/O Bus Section
47
Model III CPU Schematic Diagram - RS-232-C Interface and FDC Interface Connectors
48
Floppy Disk Interface
49
Control and Data Buffering
51
Nonmaskable Interrupt Logic
51
Drive Select Latch and Motor on Logic
51
Wait State Generation and Waitimout Logic
52
Clock Generation Logic
52
Disk Bus Selector Logic
52
Write Recompensation and Clock Recovery Logic
52
Adjustments and Jumper Options
53
Floppy Disk Controller Chip
53
Jumper Connections
53
FDC Board to CPU Board Signal Description
54
Floppy Disk Interface PC Board - Component Side
55
Floppy Disk Interface PC Board - Circuit Side
56
Floppy Disk Interface PC Board Parts List
57
Model III Floppy Disk Interface Schematic
59
RS-232C Circuit Board
61
RS-232C Technical Description
63
BRG Programming Table
63
Port and Bit Assignments
65
Port E8H
65
Port E9H
65
Port EAH
65
Port EBH
66
Port EAH Output Bits with Uart Control Register Disabled
66
Port EAH Input Bits
66
RS-232 Board to CPU Board Signal Description
67
RS-232C PC Board - Component Side
68
RS-232C PC Board - Circuit Side
69
RS-232C PC Board Parts List
70
Model III RS-232C Schematic Diagram
71
Power Supply
73
Functional Specifications
75
Troubleshooting
75
Equipment for Test Set-Up
75
Visual Inspection
75
No Output
76
Start-Up
76
Load Board Values
76
O2 Collector Waveform
76
Performance Test
77
Voltage and Ripple Specification
77
Power Supply Component Values
78
Power Supply Schematic Diagram
79
Video Monitor
81
Video Monitor Printed Circuit Board
84
Service Adjustments
85
Deflection Yoke Assembly
85
Video Monitor Assembly Schematic Diagram
86
Illustrated Parts Catalog
87
Outer Case Assembly
89
Case Top Assembly
90
Base Plate Assembly
91
Metal Chassis Assembly
92
Disk Drive Assembly
93
Illustrated Parts Catalog Parts List
94
Miscellaneous
96
Mini Disk Drive
99
General Description
101
Physical Description
101
Functional Description
101
Interface Connections
101
Physical Checkout
102
PC Board Component Locations
102
Logic Board (Component Side)
102
Non-Linear Servo Board (Component Side)
103
Linear Servo Board (Component Side)
103
Mounting the Disk Drive
104
Flat Ribbon Cable Assembly
104
Resistor Terminator
104
Cable Assembly - Connector Pin Removal Chart
104
Theory of Operation
105
Functional Block Diagram Description
105
Index
105
Spindle Drive
105
Data Electronics
106
Functional Block Diagram
106
FM Recording
106
Data Recording
107
Data Reproduction
107
Write Timing Diagram
108
Read Timing Diagram
108
Operation
109
Select Lines (DS1-DS4)
109
Direction and Step (DIR) (STEP)
109
Compensated Write Data (CWD)
109
Interface Connector PIN Assignments, J1 (External), J4 (Internal)
110
Power Connector PIN Assignment
110
Side Select (SDSEL)
111
Index Pulse (IP)
111
Write Protect (WPRT)
111
Read Data (RD)
111
Maintenance
113
Physical Description of the PC Boards
113
Circuit Board Test Points
113
Option Select
113
Logic Board Test Points and Connector Locations
114
Servo Board Connector Locations
115
Preventive Maintenance
116
Cleaning the Head
116
Alignment and Adjustment
116
Drive Motor Maintenance
116
Head Radial Alignment/Ce Alignment
117
"Cat Eyes" Pattern
117
Radial Adjustment
117
Track Alignment
118
Index Sector Adjustment
118
Track Stop Adjustment
118
Index Adjustment
118
Head Amplitude/Compliance Check
119
Final Check
119
Upper Arm and Carriage
119
Disk Controller Board Parts List
120
Servo (Motor Control) Board Parts List
124
Illustrated Parts Catalog - Exploded View
126
Mini-Disk Drive Schematic
128
Non-Linear Servo Board
130
Linear Servo Board
130
Mini-Disk Drive Schematic of New Board
131

Radio Shack TRS-80 III Operation And Reference Manual (274 pages)

Brand: Radio Shack | Category: Desktop | Size: 6.84 MB

Radio Shack TRS-80 III Service Manual (134 pages)

Microcomputer

Brand: Radio Shack | Category: Desktop | Size: 8.19 MB

Table of Contents
6
Section VII - Video Monitor
16
RS-232C Board to CPU Board Signal Description
67
RS-232C PC Board - Component Side
68
RS-232C PC Board - Circuit Side
69
Model III RS-232C Schematic Diagram
71
Test Set-Up
75
02 Base Waveform
76
02 Collector Waveform
76
Power Supply Schematic Diagram
79
Section VI- Power Supply
79
Video Monitor Printed Circuit Board
84
Deflection Yoke Assembly
85
Video Monitor Assembly Schematic Diagram
86
Outer Case Assembly " 81 2 Case Top Assembly
90
Base Plate Assembly
91
Metal Chassis Assembly
92
Disk Drive Assembly
93
Section VIII - Illustrated Parts Catalog
94
PC Board Component Locations (Logic Board)
102
Cable Assembly - Connector Pin Removal Chart
104
Resistor Termination
104
FM Recording
106
Functional Block Diagram
106
Read Timing Diagram
108
Write Timing Diagram
108
Interface Configuration
109
Logic Board Test Points and Connector Locations
114
Servo Board Connector Locations
115
11 "Cat's Eyes" Pattern
117
Radial Adjustment
117
Index Adjustment
118
Index Sector Timing
118
Track 00 Stop Adjustment
118
Upper Arm and Carriage
119
Illustrated Parts Catalog - Exploded View
126
Mini-Disk Drive Schematic (Sheet 1)
128
Mini-Disk Drive Schematic (Sheet 2) 121 19 Servo Board Schematic 122 20 Mini-Disk Drive Schematic (New Board)
131
Mini-Disk Drive Schematic (New Board)
132

Radio Shack TRS-80 III Owner's Manual (163 pages)

Mini-Disk Operation, TRSDOS Disk Operating System, Disk BASIC Programming Language

Brand: Radio Shack | Category: Desktop | Size: 19.08 MB

Radio Shack TRS-80 III Service Manual (132 pages)

Microcomputer

Brand: Radio Shack | Category: Desktop | Size: 30.31 MB

Radio Shack TRS-80 III Service Manual (132 pages)

Brand: Radio Shack | Category: Desktop | Size: 6 MB

Radio Shack TRS-80 III Operation Manual (30 pages)

Brand: Radio Shack | Category: Desktop | Size: 1.52 MB

Table of Contents
2
1 Brief Description of Basic System

3
2 Installation

6
3 Operation

8
- Using the RESET Switch
  8
- Inserting a Diskette
  9
- Removing a Diskette
  10
- Loading the Operating System
  10
- Keyboard Operation
  11
- Video Display Adjustment
  14
4 Power-Up Diagnostic Messages

15
5 Care and Maintenance

17
- Care of Diskettes
  17
- Tips on Labeling Diskettes
  17
6 Add-Ons

19
7 Specifications

23
- Display Character Set
  23
- Power Supply
  24
- Floppy Disk Drive
  25
- Serial Interface Signals and Levels
  26
- Parallel Interface Signals and Levels
  27

Radio Shack TRS-80 III Service Manual (7 pages)

Modification Kit, First Internal Disk Drive

Brand: Radio Shack | Category: Desktop | Size: 0.29 MB

Radio Shack Categories

Cordless Telephone

Scanner

Telephone Radio

Desktop

More Radio Shack Manuals

Radio Shack TRS-80 III Manuals

Table of Contents

Basic Language Section

Figures and Tables

Table of Contents

Table of Contents

Table of Contents

1 Brief Description of Basic System

2 Installation

3 Operation

4 Power-Up Diagnostic Messages

5 Care and Maintenance

6 Add-Ons

7 Specifications

Related Products

Radio Shack Categories