Tape and disk loaders for the Commodore 64
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.
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: Digital formats for storing low-level tape and disk contents
- Disk images (NIB, G64, FDI, RAW)
- Tape images (TAP)
-
Chapter Three: Disk loaders
- Vorpal (later)
-
Chapter Four: Tape loaders
- Data transfer
- Difference between READ and WRITE signals
- Digital tape sampling, the TAP format
- Commercial tape loaders
- Mega-save instance used in Cauldron (non-IRQ-based loader)
- Ocean loader instance used in Terminator 2 (IRQ-based)
- Timing example: decoding 4 bits
- Pulse threshold for tape loaders
- CIAs and Vectors
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