Z80 Information

Introduction

The Zilog Z80 CPU has been- and is being used in countless different systems.

Home Computers, Embedded Systems, Calculators and more

As a kid, we got an Amstrac CPC 464 which has a Z80 CPU. I never learned to program for that machine, but I did enjoy a lot of games on it. Just under 40 years later I have another Amstrand computer. An Amstrad NC100 which also has a Z80 CPU.

This time I was determined to learn how to program assembler for the Z80 and to help with that, I have createt these pages. They are more or less a copy of the Zilog Z80 manual.

Contents

• Manual downloaded from zilog.com on the 19th of November 2021.
• Registers goes over the internal registers and some architecture
• Interrupts covers the different interrupt modes and how to use them.
• Flags describes the flags and the opcodes using them.
• Instructions are covered in a general fashion.
• Instruction Groups lists all instructions grouped by type.
• Reference lists all instructions in Opcode Reference Charts.