first edition, third print	In English
LCCN: 79-63607 (Library of Congress) Radio Shack Cat. No. 62-2006	Publisher: Radio Shack 1980

Table of Contents

Section I. General Concepts
Chapter 1: TRS-80 and Z-80 Architecture	11
Functional Blocks
What Are All These Ones and Zeros
CPU, Memory, and I/O
The Z-80: A Chip Off the Old Block
Chapter 2: Z-80 Instructions	24
The Z-80 Family Tree
How Long Is an Instruction
Wait a Microsecond
Instruction Groups
Data Movement
Arithmetic, Logical, and Compare
Decision Making and Jumps
Stack Operations
Shifting and Bit Operations
I/O Operations
A Program of a Thousand Instructions Begin With the First Bit
Chapter 3: Z-80 Addressing	41
Why Not One Addressing Mode
Implied Addressing: No Addressing at All
Immediate Addressing
Register Addressing
Register Indirect
Direct Addressing
Relative Addressing
A Special Type of Call
Indexed Addressing
Bit Addressing
Conclusions and Confusion
Chapter 4: Assembly Language Programming	58
Machine-Language Coding
TRS-80 Editor/Assembler
Editing New Programs
Assembling
Loading
Assembler Formats
More Pseudo-Ops
A Mark II Version of the Store "1" Program
Further Editing and Assembling
Chapter 5: T-BUG and Debugging	75
Loading and Using T-BUG
T-BUG Commands
T-BUG Tape Formats
Standard Format in Following Chapters
Section II. Programming Methods
Chapter 6: Moving Data in Bytes, Words, and Blocks	87
Byte and Word Moves
Filling or Padding
An Unsophisticated Block Move
An Elegant Block Move
FILL Subroutine
MOVE Subroutine
Subroutine Format
Stack Operation
Chapter 7: Arithmetic and Compare Operations	108
Number Formats: Absolutely and Positevily
Signed Numbers
Adding and Substracting 8-Bit Numbers
Adding and Substracting 16-Bit Numbers
A Precision Instrument
Decimal Arithmetric
Compare Operations
Chapter 8: Logical Operations, Bit Operations, and Shifts	131
ANDs, ORs, and Exclusive ORs
Bit Instructions
Shiftless Computers
Rotates
Some Shifting Is Very Logical
Arithmentic Shifts
Software Multiply and Divide
Input and Output Conversions
Chapter 9: Strings and Tables	151
Assembler-Generated Strings
Generalized String Output
String Input
Block Compares
Table Searches
Unordered Tables
Ordered Tables
Chapter 10: I/O Operations	167
Memory Versus I/O
Keyboard Decoding
Display Programming
Mysteries of the Cassette Revealed
Read-World Interfacing
Discrete Inputs
Chapter 11: Common Subroutine	189
FILL Subroutine
MOVE Subroutine
MULADD Subroutine
MULSUB Subroutine
COMPARE Subroutine
MUL16 Subroutine
DIV16 Subroutine
HEXCV Subroutine
SEARCH Subroutine
SET, RESET and TEST Subroutines
Section III. Appendices
Appendix I: Z-80 Instruction Set	205
Appendix II: Z-80 Operation Code Listings	209
Index	221