This is an excellent article from the Commodore Computer Club newsletter (March 1984) on aligning the head of a 1541 floppy drive.

Dwheeler.Com-David A Wheelers 6502 Language Implementation Approaches

6510 Addressing Modes

A 256 Byte Autostart Fast Loader For The Commodore 64

A History of Gaming Platforms The Commodore 64

Accessing Laser Printers for Commodore

Assembler Tutor 1

Assembler Tutorial 1

Assembly In One Step

C64 Assembler Tutorial

C64 Online

C64 Rom Dissasembly

Nice little guide on how to call Commodore 64 BBS systems using telnet instead of a dial-up modem.

C64 Tricks and Tips

Commodore 64 ROM Tape Routines Disassembly and Documentation by Fungus/Nostalgia 8/2023 Revision 3

Acknowledgements for resources and references used:

• Nick Hampshire (C64 Rom Disassembly)
• Luigi Defraia (TCE) (CBM Tape Loader Format)
• Tom Roger Skauen (SLC) (Bouncing thoughts, confirmation of data)
• Martin Piper (Timing Code verification)
• Michael Steil (mist64) (CBM Source Code, final verifications)
• Pontus Berg (Bacchus) Inspiration

This document was created in order to gain a complete understanding of the tape routines, to correct errors in other documents, and for fun.

CC65 Tutorial

Clockport Expander

Clockslide How To Waste An Exact Number Of Clock Cycles On The 6502

Comal On The Commodore 64

Written by Marko Mäkelä  and Pekka Pessi, this is an extremely detailed guide on adding memory to the Commodore 64.  The guide has in depth coverage of the chip level upgrade and information on how to work with the expanded memory in both BASIC and ML.

Commodore 64 PETSCII Codes

Commodore 64 VIC Guide

Commodore C64 SID Note Values

A Technical Overview of Commodore Copy Protection

Commodore Error Messages is a concise two-page reference sheet explaining error and status messages for Commodore B-Series computers, including common BASIC problems such as syntax errors, bad subscripts, type mismatches, missing files, device errors, division by zero, out-of-memory conditions, and disk or tape verification failures. It also lists numbered ERR$(X) messages with expanded explanations, helping programmers diagnose problems in program flow, input/output operations, arrays, calculations, file handling, and storage media.

This document is a really nice reference for the various file/compression formats you'll find on the Commodore platform.  Most of this information has been written and compiled by Peter Schepers.

This document describes the IEC-bus information gathered during the development of the 1541-III.

Disk Format Layout

GCR Decoding On The Fly

Hacking The V-1541

Hello World In C64 Assembly

Help With MMC2IEC And SD2IEC

Excellent article bt Al Derosa on how to install the Commodore 64 Image BBS v3.0 into the VICE emulator.  There is also some excellent historical information in this guide on the development of Image BBS over the years and the NISSA association.

Jiffydos 6.01 ROM Dump

Machine Code Programming On The C64

Making Stable Raster Routines

This is a review of the Micro SwinSID with some pictures and details about the SID replacement.

Passing Strings Between Basic And ML

Putting The C64 Online

Quick Start To C64 ML Programming

Random Numbers In Machine Language For Commodore 64

Rear Admiral Ebay Ad

The Rear Admiral is a clone of the Ltk. Kernal hard drive for the Commodore 64.