Tape and disk loaders for the Commodore 64
Free!
Minimum price
$9.99
Suggested price

Tape and disk loaders for the Commodore 64

An advanced analysis to support the preservation effort for the most popular 8-bit computer ever

About the Book

This book is an effort to collect technical details about tape and disk loaders for the Commodore 64 in a single place, providing the ultimate reference material for a comprehensive software preservation effort.

About the Author

Luigi Di Fraia
Luigi Di Fraia

I am a DevOps Engineer so I get to work with the latest technologies and open-source software such as Terraform, Ansible, Docker, Kubernetes, Helm, within an AWS-based platform. However, in my private time I enjoy retro-computing: my projects are often related to the Commodore 64. The latter was the first programmable home computer I had when I was a teenager. My passion for this system has only grown over time, to the point that I designed both new hardware interfaces and software for it. You can find a few more details around here and within my WordPress.com blog.

From an education/background perspective I should mention that I hold a Master’s Degree in Electronics Engineering and I am specialized in the design of electronic medical equipment. However, my thesis was worked at within the Department of Electronic Measurements of the University of Naples “Federico II”, where I developed part of the analog interface and the whole firmware for accurate distance measurements by means of ultrasonic echo detection. An accurate detection of the on-set point of the ultrasonic echo was achieved by using a Discrete Kalman Filter, implemented on a Microchip DSP.

After obtaining my Masters Degree I completed a five-month Network and Network Security post-graduate course that gave me a better view of the TCP/IP stack, of the PKI infrastructure, and of Security Hardening methods for computer networks. Most of the Networking material I became familiar with during the course formed the basis of Cisco’s “CCNA” curriculum.

Along with these education experiences, I always enjoyed computer programming: very early in BASIC for my Commodore 64, then using AMOS for my Commodore Amiga 500, through to command-line PC applications written in “C”. I subsequently got exposed to the Win32 API for building GUI applications, and eventually to the GTK+ 2 framework, which I adopted heavily due to its multi-platform support.

Having acquired some experience with embedded system development during the work on my thesis, and having enjoyed it, I also started making plans about designing an embedded device of mine, the DC2N. During the discovery activities I abandoned the red path (Microchip) in order to walk along the blue one (Atmel) and I started using the AVR family of 8-bit micro-controllers: from the ATMega32 onwards. A few years ago I started developing for the Atmel SAM7S and NXP LPC17xx family of 32-bit ARM Cortex processors. Very recently I settled for ST’s low-cost STM32 family of microprocessors that provide good value for price.

Table of Contents

  • Foreword
  • Chapter One: Disk drive hardware
    • How the block-sync and byte-sync signals of a Commodore 1541 drive work
    • How to tell if a disk sector was overwritten by a CBM drive
  • Chapter Two: Cassette port signals
    • Data transfer
    • Difference between READ and WRITE signals
  • Chapter Three: Digital formats for storing low-level tape and disk contents
    • Disk images (NIB, G64, FDI, RAW)
    • Tape images (TAP)
  • Chapter Four: Disk loaders
    • Vorpal (later)
  • Chapter Five: Tape loaders
    • Commodore’s ROM loader
    • Commercial tape loaders
    • CIAs and Vectors

The Leanpub 60 Day 100% Happiness Guarantee

Within 60 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.

Now, this is technically risky for us, since you'll have the book or course files either way. But we're so confident in our products and services, and in our authors and readers, that we're happy to offer a full money back guarantee for everything we sell.

You can only find out how good something is by trying it, and because of our 100% money back guarantee there's literally no risk to do so!

So, there's no reason not to click the Add to Cart button, is there?

See full terms...

Earn $8 on a $10 Purchase, and $16 on a $20 Purchase

We pay 80% royalties on purchases of $7.99 or more, and 80% royalties minus a 50 cent flat fee on purchases between $0.99 and $7.98. You earn $8 on a $10 sale, and $16 on a $20 sale. So, if we sell 5000 non-refunded copies of your book for $20, you'll earn $80,000.

(Yes, some authors have already earned much more than that on Leanpub.)

In fact, authors have earnedover $14 millionwriting, publishing and selling on Leanpub.

Learn more about writing on Leanpub

Free Updates. DRM Free.

If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).

Most Leanpub books are available in PDF (for computers) and EPUB (for phones, tablets and Kindle). The formats that a book includes are shown at the top right corner of this page.

Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.

Learn more about Leanpub's ebook formats and where to read them

Write and Publish on Leanpub

You can use Leanpub to easily write, publish and sell in-progress and completed ebooks and online courses!

Leanpub is a powerful platform for serious authors, combining a simple, elegant writing and publishing workflow with a store focused on selling in-progress ebooks.

Leanpub is a magical typewriter for authors: just write in plain text, and to publish your ebook, just click a button. (Or, if you are producing your ebook your own way, you can even upload your own PDF and/or EPUB files and then publish with one click!) It really is that easy.

Learn more about writing on Leanpub