This 60 page doc covers all three of the 1541 Ultimate units (1541u, 1541u II, 1541u II+).

This documentation is basically for all three of Gideon's supported hardware [1541 Ultimate II, 1541 Ultimate II+ & Ultimate 64] projects using firmware up to v3.7 (Which is 1.28 on the Ultimate 64).  Anyway, you can find the most current documentation here online.  The reason I put snapshots of it online is because someday (possibly) someone will want to look back and see the progression of this awesome piece of hardware.

ARM2SID is a new replacement for 2 Commodore SID music chips and more. ARM2SID is a bigger brother of our well known ARMSID, which is a real "plug & play" solution and fully replaces both the MOS6581 and MOS8580 chips.
ARM2SID comes whenever 2 SID chips are needed, usually for stereo. If you have 2 SID sockets, just place the ARM2SID in the primary socket, SID2 in the secondary socket, connect both of them with the provided 5 or 10 cm cable, configure with the provided C64/C128 utility and go.
If you have just one socket and are not afraid of soldering, you can get even more. Use the provided connector cable, connect the 6 wires to your C64/C128 and you get the 2nd SID for stereo, the 3rd SID for 3SID music and OPL FM synthesis compatible with FM Sound Expander!
Enjoy your ARM2SID!

Despite rumors of a forthcoming 'paperless' society brought about by the innovations of electronics technology, computer user of today still derive much satisfaction and have great need for seeing the results of their efforts on a hard copy printout. This introductory section is provided to offer some general observations on what printers are and how they work. It is intended as an introduction for novice users and a base upon which they can expand their knowledge.

This printer is an attractive, efficient, and versatile printer. The wide variation of character sets and its sufficient function capability allows you to print text and graphic in a wide range of different print styles. The printer is designed to operate through software control, supplied from the any general purpose micro-computer, personal computer, office computer, etc. that has provision of printing data out-put that should
conform with this specification.

Thanks Anthony for providing this manual.

Cannon BJ-200e Printer User's Manual

This manual and the programs on the cassette show you how to use the Cardriter 1 Light Pen for selecting items from a menu, for responding to prompts, for answering multiple-choice questions, and for playing games. We'll also give you details on programming for the light pen and on how the pen works.

CBUS stands for Cartridge Back-Up System. CBUS I produces backup copies of cartridges for the Commodore 64. Using CBUS I saves wear and tear on ths Commodore 64  expansion connector by tricking the computer into running an image of the cartridge without having the cartridge physically present. Up to 17 cartridges can be stored on a single diskettae. With CBUS I, cartridges can be storad out of harms way rather than cluttering up the work area. CBUS I incorporates a RESET switch allowing you to perform a COLD Start without having to turn the machine off and on again. This permits study of cartridge object code, opening up the possibility of custom modifications.

The CMD FD-2000 and FD-4000 are 3.5 inch floppy disk drives which have been designed utilizing the latest in micro-floppy technology. While retaining backward compatibility with Commodore 1581 formatted diskettes(800K), these drives are also capable of utilizing high density (HD) disks fora storage capacity of up to 1.6 Megabytes. The FD-4000 model can also use the newer enhanced density (ED) diskettes for a storage capacity of up to 3.2 Megabytes.

The CMD HD has been designed to be the easiest-to-use hard drive system available for Commodore 64 and 128 computers.

CMD RAMLink extends the capabilities and compatibility of RAM expansion units for the Commodore 64 and 128 series of computers.

The Turbo232 cartridge is a high-speed RS-232c modem interface which allows you to connect standard external modems to your Commodore 64 or 128 computer. When used with appropriate terminal software, this cartridge allows you to connect to communications networks at speeds up to 230,400 bps (230Kbps). The interface plugs easily into the cartridge port of any Commodore 64 or 128 computer, and provides an industry standard DB-9 port for attaching external modems.

I have one of these adapters and although it's not the 5.1 version, I figure someone else might benefit from the manual, so here it is.

Find much more info here.

The Commodore 1351 Mouse is a controller designed for use with the Commodore 64 or Commodore 128 computers.  It features two buttons on the top, and a ball on the underside that is rolled upon a flat surface to manipulate on screen activity.

Basically, this manual is divided into two parts. The first part includes the introduction, mouse cleaning, and tips for general care of the mouse. That part is for the user with mouse-compatible software, who wants simply to plug in the mouse and begin using it. The second part of the manual contains information needed by those who wish to develop software for the mouse.

Commodore 1764 RAM Expansion Manual.

Outstanding color . . . sound synthesis . . . graphics . . . computing capabilities . . . the synergistic marriage of state-of-the-art technologies. These features make the Commodore 64 the most advanced personal computer in its class.

The Commodore 64 User's Guide helps you get started in computing, even if you've never used a computer before. Through clear, step-by-step instructions, you are given an insight into the BASIC language and how the Commodore 64 can be put to a myriad of uses.

For those already familiar with microcomputers, the advanced programming sections and appendices explain the enhanced features of the Commodore 64 and how to get the most of these expanded capabilities.

The Commodore 64 user's manual is an easy-to-use guide that 64 can be put to an assortment of fun and valuable uses.

Introductory topics discussed in this manual include:

• How to set up your computer
• BASIC programming for beginners
• Sprite graphics
• Creating sound

For those of you already familiar with microcomputers, the advanced programming sections help to explain the special features of the Commodore 64. Learn to expand your present programming capabilities through such Informative sections as:

• Advanced BASIC
• Advanced color and graphic commands
• Advanced data handling

Also supplied is an informative appendix which contains charts, tables and error messages.

Commodore MPS 1200 Dot Matrix Printer User's Guide

Commodore MPS 1230 Dot Matrix Printer User's Guide

Commodore MPS 1250 Dot Matrix Printer Manual.

Commodore MPS 802 Printer User's Guide

Commodore MPS 803 Dot Matrix Printer Users Guide - A Friendly Introduction to Your MPS-803 Dot Matrix Printer

Commodore MPS-1000 Dot Matrix Printer Manual

You've made a wise purchase... the Plus/4 is the first home computer ever designed especially for productivity applications.  Of course, it's still able to do all the other things a home computer can be used for. This manual is designed to help you learn those "other things" yourPlus/4 can do.

This documentation was provided by one of our users (thank you Jeff) that explains the use of a hardware dongle by Datalock.  Here is an excerpt from the documentation:

Datalock security keys are small plastic devices which plug into the joystick port. The program you want to protect is made to read the unique circuit inside the key. If the correct key is not present, the program will not work.

Epyx FastLoad Cartridge Manual

The EZ-232 Interface, designed by Jim Brain, provides a low-speed serial port for Commodore 8-bit computers. It can operate at speeds of up to 2400bps, when configured as a standard interface, and at speeds of up to 9600bps, when configured as a UP9600 interface.

Final Cartridge III User Manual [English]

** Nice webpage with pictures of the original and newer Final Cartridge III+ . Also check out the Wiki for more details.

IDE64 Instruction Manual for v0.89

IDE64 Users Guide [February 24th ,2019]

Today on the C64 OS Discord channel a user named Kroc pointed out this link to a completely recreated JiffyDOS 6 User's Manual by Martin Maciaszek done sometime in 2016.  This version is ready for professional printing.

Today on the C64 OS Discord channel a user named Kroc pointed out this link to a completely recreated JiffyDOS 6 User's Manual by Martin Maciaszek done sometime in 2016.  This version is optimized for viewing on a screen.

Complete & searchable PDF version of the JiffyDOS v6.01 Users Manual.

Kerberos MIDI Flash C64 / C128 Interface Developer's Guide

KeyDOS ROM is a chip that contains 20 new function key definitions and 20 great utilities. KeyDOS ROM is easy to install in the empty ROM socket in any C128 or C128D. KeyDOS ROM can also be installed in the space for an empty socket in Commodore 1700, 1764, and 1750 RAM Expansion Units.

MAGNUM LOAD!  Doesn't that just sound official... I mean seriously, do you want just another "fast load" or something serious like MAGNUM LOAD!

Master Adapter Supplement [Turbo Master]

Comprehensive documentation of all BASIC 65 commands, functions and operators for the Mega 65 computer.

Please visit the official Mega65 files page to get the latest version.

This refence describes the MEGA65’s native memory map, that is, where all of the memory, I/O devices and other features appear in the 28-bit ad- dress space. We will then explain how C64 and C65 compatible memory maps are accessed from this 28-bit address space.

Please visit the official Mega65 files page to get the latest version.

Congratulations on your purchase of one of the most long-awaited computers in the history of computing! The MEGA65 is community designed, and based on the never-released Commodore® 651 computer; a computer designed in 1989 and intended for public release in 1990. Decades have passed, and we have endeavoured to invoke memories of an earlier time when computers were simple and friendly. They were not only simple to operate and understand, but friendly and approachable for new users.

Congratulations on your purchase of one of the most long-awaited computers in the history of computing.The MEGA65 is a community designed computer, based on the never-released Commodore® 651computer; a computer designed in 1989 and intended for public release in 1990. Decades have passed, and the MEGA65 invokes an earlier time when computers were simple and friendly. They were not only simple to operate and understand how they work, but friendly and approachable for new users.

Manual / Docs for the Mini X-Pander by Arkanix Labs.  The Mini X-Pander is a cartridge port expander for the C64 / 128 that lets you use more than one cartridge at a time.  It also includes a reset switch.

The miniGANGCART cartridge supports fast loading and writing procedures for stations 1541, 1541C, OCEANIC 9900, 1541II,1570/1571 (in GCR1541 mode) and 1581, SD2IEC for the PAL / NTSC Commodore 64 version. The area that can be uploaded and burned using quick procedures is included in almost the entire C64 memory, that is from $0400 to $ FFFF.

USI International created Mitey Mo because we felt that sending and receiving information with computers over phone lines (telecommunicating) should be easy, inexpensive, and fun. We wanted a modem and software package friendly enough for the novice user and advanced enough for the most sophisticated user regardless of age. We started with this mighty little modem that combines the latest in technology with the convenience of small size and easy installation. To that we added software written specifically for this modem that gives directions on the screen in plain English. We wrote a manual that is thorough, easy to understand, and enjoyable to read. Further more, we've included phone cables and a function key template in our package to make it complete. Our total system makes it easy for you to get started while at the same time bringing out the full capacity of your Commodore 64.

Users manual for the MMC Replay (updated 2/7/2008 - BIOS v0.51).

Congratulations on your purchase of the NEOS MOUSE & CHEESE.  The NEOS MOUSE is an excellent input device with which you can give various instructions singlehanded to a computer while watching the TV screen,etc.  Before using the mouse read this manual carefully to get the most out of the NEOS mouse and the software ''CHEESE".

Network Flyer (http://retroswitch.com) User's Guide v1.1

The OC-118N Disk Drive is a versatile and efficient disk drive built for the Commodore series or personal computers. This drive is fully compatible with the Commodore 64 computer and directly replaces the Commodore 1541 Disk Drive, giving much better performance in terms of data loading and writing speed and memory buffer size.