Imported from GitHub: thorpej/pg09-system · commit 23f3b91 · license BSD-2-Clause

Description

6809 Playground - main system

README

6809 Playground

Welcome to my 6809 Playground! This project is about building a general purpose 8-bit computer based on the Motorola 6809 CPU. While this is definitely a retro-computer project, I'm not going to be dogmatic about it -- modern gadgets that add value to the project will have a home here, too.

The whole point of this exercise is to learn-by-doing and have fun in the process. I have a few ideas about how I want the project to go, but it may veer this way or that as it progresses. We'll see!

I invite you to follow along with this YouTube playlist. As each installment is posted, this README will be updated with additional information about the that installment, including links to data sheets and a parts list.

If you learn something from this, if you decide to build one of these yourself, or if it inspires you embark on a similar adventure on your own, I would love to hear from you!

01 - Introduction

In the first installment, I briefly introduce the project and provide some background.

Video link: 01 - Introduction

02 - Clock Generator

In the second installment, I describe the design and implementation of the clock generator circuitry.

Major components:

• 74ACT163 binary counter
• 74ACT109 dual J-/K flip-flop
• Lattice GAL22V10 or Atmel ATF22V10 electrically-eraseable programmable logic device

Video link: 02 - Clock Generator

03 - Reset Generator

This the third installment, I describe how the reset generator works.

Major components:

• Dallas Semiconductor DS1813

Video link: 03 - Reset Generator