Build a Powerful Z80 Computer in Four Stages

Introduction

Thisinstruction takes a simple Z80 design and build it in stages into a high performance, sophisticated Z80-based system. The Z80 computer is functional in each stage, more functionalities are added in each subsequent stages. The goal is a high-performance, expandable, CP/M capable Z80 system. This Z80 SBC is based on Z80SBC64.

Stage 1

Bill of materials

A minimally functioning Z80.

Features at Stage 1

22MHz Z80
128K RAM
Serial bootstrap

Pictorial stage 1 assembly guide.

Theory of operation

Software for Stage 1 Z80 SBC

Stage 2

Features at Stage 2

22MHz Z80
128K RAM
Serial bootstrap

Back-up battery for RAM and protected RAM area for bootstrap code

Pictorial stage 2 assembly guide

Software for Stage 2 Z80 SBC

Stage 3

Features at Stage 3

22MHz Z80
128K RAM
Serial bootstrap

Compact flash interface and CP/M

Pictorial stage 3 assembly guide

Software for Stage 3 Z80 SBC

Stage 4

Features at Stage 4

22MHz Z80
128K RAM
Serial bootstrap

RC2014 Expansion bus

Solderless breadboard experiments

Pictorial stage 4 assembly guide

Software for Stage 4 Z80 SBC

Table of Contents