Cassiopei: To make a long story short, the Cassiopei (which stands for CASSette IO Peripheral Expansion Interface) is a device that connects to the cassetteport of your CBM computer. Although it can playback .TAP files and act like a datasette… it is much more then your ordinary digital tape player! One key aspect is that the Cassiopei can also playback .PRG files and it can load them 50x faster then Commodore's standard tape loading protocol.
CBM Tape Pi: Use a Raspberry Pi as datassette drive with your Commodore 8-bit computer!
CBM-HD: CBM-HD is a project where a PC simulates one or more IEEE devices. If you are familiar with 64HDD, a PC simulating a 1541 drive, then you can consider CBM-HD as its IEEE equivalent.
CBM-Transfer: CBM-Transfer is a front-end to several command-line utilities for transferring files and working with disk images. CBM-Transfer makes using those utilities easy by providing a familiar windows interface that removes the need to learn the commandline syntax of each program. CBM-Transfer also includes a multi-format file and picture viewer.
Commodore C64 & Amiga PSU: New power supply (PSU) for Commodore C64, C64C, C128, VIC-20 & Amiga 500, 600, 1200. Power-on the memories!
Commodore Computers: VIC20, PET, C64, PLUS4, C128, KIM1, History, Prototypes, Pictures, Manuals, Advertising & ROMS.
Commodore News: On this page you can find news items that are related to Commodore. Every week there are new news items. The items can also be viewed by category and there is a search function available.
Commodore Software: Utilities, Apps & More for Your Commodore 64, 128, 16, Plus 4, VIC 20 & PET Computer.
Commodore Spain (SPA): Si alguna vez te preguntaste donde podrías tener todo el conocimiento de COMMODORE en una sola web, ya has encontrado la respuesta. Realizada por y para amantes del COMMODORE, con todo lo que cualquier usuario pasado y presente del COMMODORE necesita para revivir un momento de su vida.
Cute32: Cute32 is a fully featured tool that allows archival and replay of all tapes designed for CBM 8-bits machines (Commodore 64, VIC-20, PET, Plus4, C16 etc). CUTE32 is able to completely and accurately emulate a Commodore Tape recorder C2N 1530-1531 in all of its functionalities but, unlike the original tape recorder CUTE32 takes advantage of digital file storage on Micro SD cards to archive the original magnetic tape content. This prevents data losses due to wear-and-tear that are very common when using cassette tapes to store digital information. CUTE32 comes in a high-quality box that reproduces (smaller scale) an original Commodore Tape recorder.
DC2N: The DC2N can be used for three purposes: make backups of PET, Commodore 64/128, Vic20, C16/+4, Spectrum, BBC, MSX, and Spectravideo tapes (including using both signal edges, a.k.a. halfwaves); record from a PET, C64/128, VIC20 (with a third party adapter C16 is supported as well); and playback v0 and v1 TAP files to PET, C64/128, VIC20 (with a third party adapter C16 is supported as well).
OpenCBM: Win 7/8/10, and Linux/i386/AMD64 kernel driver and development library to control serial CBM devices, such as the Commodore 1541 disk drive, connected to the PC's parallel port via a XM1541 or XA1541 cable. Fast disk copier included. Successor of cbm4linux. Also supports the XU1541 and the XUM1541 devices (a.k.a. “ZoomFloppy”).
ftp.zimmers.net: This archive contains documentation and software for Commodore Business Machines' 8-bit computers.
Pi1541: Pi1541 is a real-time, cycle exact, Commodore 1541 disk drive emulator that can run on a Raspberry Pi 3B, 3B+ or 3A+. Commodore 1581 emulation supported since V1.13! The software is free and I have endeavored to make the hardware as simple and inexpensive as possible. Pi1541 provides you with an SD card solution for using D64, D81, G64, NIB and NBZ Commodore disk images on real Commodore 8 bit computers such as Commodore 64, Commodore 128, Commodore Vic20, Commodore 16, Commodore Plus4.
PLAdvanced+ (DEU): Bei der PLAdvanced+ handelt es sich um ein Ersatzteil für die PLA. Einzigartig daran ist die vielseitige Verwendbarkeit. Die Entwicklung ist ein Universal-Chip, der nicht nur in einem C64, sondern in neun verschiedenen Geräten eingesetzt werden kann. Die Einstellung dazu erfolgt mittels DIP-Schaltern.
Retro Commodore: Your place with high quality scans for preservation.
Style: We make demos, tools, and toys for your Commodore Business Machine.
TEDuino: A Modern TED (264) Series Commodore Datasette. For this project I use another Arduino, in this case the inexpensive Arduino Nano version, some easy to source electronic components, and a 3D printer to create a Commodore 264 series inspired Datasette replacement I call, the TEDuino.
The Commodore Knowledge Base: The Commodore Knowledge Base is an assimilation of various articles on Commodore repair, programming and technical issues, ranging from beginner level to advanced, covering a diverse series of topics from CP/M to hardware modifications. CKB covers the gamut of Commodore 8-bit systems, not Amiga and very little on the PC series. Emulator content is intentionally limited, although cross-platform development is a considered topic. CKB articles originate from many sources, largely the Usenet group comp.sys.cbm, patrolled by a news robot maintained by Cameron Kaiser. Kurt Brandon has also provided a significant number of articles gleaned from BBSes and the now defunct QLink online service. Other notable contributors include: Marko Mäkelä, Stephen Judd, John Iannetta, Doug Cotton, Nicolas Welte, Jim Butterfield, Jim Brain, Ray Carlsen.
The Future was 8bit - SD2IEC: Of all the methods of loading stuff into your Commodore, TFW8b's SD2IEC SD card interfaces are the business. SD2IEC provides much of the functionally a 1541 disk drive, supports fast loaders like JiffyDos, Final Cartridge III and Epyx FastLoad. TFW8b.com version of the SD2IEC is the most common method of loading/saving on a Commodore 8bit Today!
The Secret Weapons of Commodore!: They were the secret weapons! The unrealized phantasms of technological wonder! The ravings of mad geniuses made flesh and locked away in caverns of dust never to see the light of day! The demons that Tramiel forgot, to come tapping at their door even as the winds of oblivion beckon and spit!
Uno2iec: A commodore (CBM) 1541 emulator on the Arduino Uno, using any desktop PC (or raspberry PI with raspbian) as a media host. The UNO2IEC device simulates a 1541 drive and enables loading and saving files or programs between a CBM and any “current” folder on the host system. The host system location can be a network share, an USB or SD flash media, SSD or any hard disk that is supported by a Windows, Linux or Mac operating systems.
A.D.A. Amiga Demoscene Archive: On the Amiga Demoscene Archive, you will find some of the best demos and intros released on the Amiga.
A314: The A314 is an expansion board for the Amiga 500 that goes in the trapdoor expansion slot. A Raspberry Pi (RPi) is attached to the A314, and the A500 and the RPi can communicate through a shared memory. We have constructed a communication protocol through which associated processes on each platform (Amiga and RPi) can allocate logical channels, carried over one physical SPI channel. The protocol is handled by a driver on each side (a314.device on the Amiga and a314d on the RPi). The drivers are responsible for alerting receiving processes of incoming data via an interrupt.
Amiga 1000 Phoenix Revival Page: This page is dedicated to Phoenix Microtechnology and all persons involved in research and realization of the Phoenix Motherboards.
Amiga 1000 Webseite (DEU): Willkommen auf meiner Amiga 1000 Webseite! An dieser Webseite bastele ich immer weiter, schaut also öfters mal rein, denn es wird immer wieder was Neues geben. Hier möchte ich euch alles rund um den Kultcomputer Amiga 1000 näher bringen.
Amiga-Digital-Video: Add pixel-perfect HDMI output to the Amiga machines. For all Amiga versions that have a socketed DIP Denise chip, a rather small adapter board can be used to extract the digital video signal (12 bit) to a 40-pin connector compatible with the Raspberry Pi Zero. This can then be used with the RGBtoHDMI software to produce a perfect HDMI picture with very low latency (a few milliseconds at most).
Amiga FAQ: Below you find a list of frequently asked questions. It should especially be for new users but perhaps experienced users may find something too.
Amiga Future: Amiga Future is the specialised magazine concerning the Amiga. It offers the very latest news about the Amiga-Scene! It is supplied as a printed full colour magazine, with an optional CD. Older issues can still be bought as a collection of magazines as PDFs in high resolution, and are supplied on a Archive-DVD. Some sold-out printed magazines are available to view for FREE as individual images of pages on the website.
Amiga Hardware Database: A data collection about the Amiga computer and its expansions.
Amiga News.it: Tutte le novità dal mondo Amiga.
Amiga-1200: This project is a new Amiga 1200 board done from the schematics. The intent is to fit in a standard A1200 case. The RAM has been moved to a separate board. Also, the Video codec is on a separate board.
amiga-news.de (DEU): Amiga-News auf den Punkt gebracht.
Amiga PCB Explorer: The Amiga PCB Explorer is a browser application that was designed to assist people in various aspects of Amiga mainboard repairs.
Amiga Technical Resource: For schematics, connector pinouts and tips to assist with Amiga computer repairs.
amigawiki: AMIGA … my girlfriend! This exclamation has awakened countless memories and emotions for 30 years until today. It's no coincidence that the Spanish word 'Amiga' means 'the girlfriend'. This wiki tries to capture the 'Spirit of Amiga' and make it accessible to everyone.
Aminet: Aminet is a set of interconnected WWW and FTP servers hosting freely distributable Amiga software. Established in 1992, Aminet belongs to the Internet's oldest software repositories, the total size of the archive has recently crossed the 50 GB barrier.
Apollo Accelerators: Apollo Accelerators is an Amiga Classic accelerator board product line. It uses the Apollo core which is a code compatible Motorola M68K processor but is 3 to 4 time faster than the fastest 68060 at time. It also brings Amiga Classic near to Amiga NG by bringing digital video with millions of colours.
Big Book of Amiga Hardware: The Big Book of Amiga Hardware is probably the largest online Amiga Hardware reference in the world, thanks to the help of many of the site's readers. If you're looking for information on that exclusive piece of hardware, wonder what amazing expansions were actually made for the amiga, or need drivers for that second-hand kit you've just bought, then you've come to the right place.
Cracktros: Welcome to definitive AMIGA Cracktro page on the internet. Here you'll find the ultimate collection of AMIGA Cracktros and Trainers.
DiagROM: DiagROM is a diagnostic tool for the amiga computers. And it is to be used on defective machines, trying to help no-boot situations etc. You simply replace the Kickstart roms in the Amiga with the DiagROM. and when poweron. your Amiga will start a diagnostic software. It will try to dump info on the serialport (and actual menus etc aswell) while also trying on the screen. One important thing is that the software relies on as little hardware as possible. so no timers, no IRQ etc. so you can start up the machine on a very broke machine and from that test different things. and hopefully help finding hardwareissues.
Lemon Amiga: You've just come to a warmhearted place all dedicated to the Amiga computer. We bring the classic days back into the spotlight by providing a forum as well as a library stuffed with games.
OPEN AMIGA SAMPLER: Open source schematics, parts lists and documentation for building a generic 8bit/mono Amiga sampler cartridge.
OpenAmiga500FastRamExpansion: OpenAmiga500FastRamExpansion is an Open Hardware 4/8 MB Fast RAM Expansion for the Commodore Amiga 500 Computer.
OpenAmiga600FastRamExpansion: OpenAmiga600FastRamExpansion is an Open Hardware 4 MB Fast RAM Expansion for the Commodore Amiga 600 Computer.
OpenAmiga600RamExpansion: OpenAmiga600RamExpansion is an Open Hardware 1 MB Chip RAM Expansion for the Commodore Amiga 600 Computer with optional Real Time Clock.
OpenAmigaVideoHybrid: OpenAmigaVideoHybrid is an Open Hardware implementation of the Video Hybrid integrated circuit used in some Commodore Amiga computers (Commodore Part No. 390229-0x).
The Amiga 1000 Parceiro: The Parceiro (sounds like par-say-ro) attaches to the side expansion port of the Amiga and is about the size of a harmonica that’s been run over by a steam roller as it’s only about 1/3 of an inch thick. It provides the following features: 8MB of Autoconfig Fast RAM. It is a single 8MB of SRAM versus DRAM, so it really and truly is indeed fast with zero wait states - Coin-cell battery backed Real Time Clock (RTC), which comes with its own clock software that gets put into your startup sequence - SD Card Reader with 2GB MicroSD. It comes pre-formatted with the FAT32 file system and is readable on any PC as a result. This way you can quickly set up your new SD-based hard drive. It’s worth mentioning that this is running on period correct Amiga OS 1.3, too.
ZoomFloppy: ZoomFloppy brings Commodore disk archival into the 21st Century, bridging the gap between the both the IEEE-488 and IEC-based disk intelligent Commodore™ disk drive line and contemporary personal computers. Taking up the baton from the ever-popular X*-1541 line of parallel port interfaces, ZoomFloppy provides complete functionality for newer machines running multitasking and multi-user operating systems and those systems lacking the legacy parallel port upon which the X*-1541 interfaces depend.
1541 Diagnostic Cartridge - World of Jani: I have repaired a fair amount of drives, and every time I find myself loading a test or a diagnostic software from disk. This is a bit of a contradiction since the drive being tested, or repaired, might not even be able to load a program. I also have a variety of tools for different purposes and wanted to have everything in one place. This is why i created a 1541 Diagnostic Cartridge.
1541 Ultimate-II: The '1541 Ultimate' is a storage solution for your Commodore C64 and C128 home computer. This piece of hardware implements a 'real' 1541 diskdrive for Commodore computers. There are two versions of this board; the 1541 Ultimate-I and the 1541 Ultimate-II. The 1541 Ultimate-I uses an SD-card or MMC-card to store the floppy disks, while the 1541 Ultimate-II uses MicroSD and USB pen-drives. Both the 1541 Ultimate-I and the 1541 Ultimate-II contain a replica of all the necessary hardware to be fully compatible with a real drive.
64HDD: Have you ever wanted to give your old Commodore™ computers a hard drive, CD-ROM or access to the devices other modern computers have? 64HDD is software that lets you do just that, and much, much more. To get started you will need: 64HDD software; an MSDOS PC; and the readily available X-cable. Your PC will then be a hard drive system for your Commodore allowing you to LOAD, RUN and SAVE many of your favourite programs direct from the storage on your PC including games in D64 format and GEOS.
C64-Diagnostic-Rev.-586220-Harness: The Diagnostic Rev. 586220 is a widely accepted test tool for the Commodore C64. It tests the RAM, ROMs and the peripheral chips (VIC, SID, CIA). To test all interfaces, a feedback is required. This is provided by this harness.
C64 1541 Speed Test: A utility to test and fix a 1541,1541 II, 1570, 1571 or OC118 disk drive.
C64 cracker intros in your browser: Remember those good old days on the C64? Get a cup of coffee, sit back and enjoy a few minutes of flashback.
C64 Modulator replacement: C64 Composite/S-Video RF Modulator Replacement. Based on the C64 RF-modulator mod by Zero-X / OMS, this adapts those schematics to create a complete replacement for the original modulator including a few changes of my own. A nice writeup and the my original inspiration for making this version if it came from a blog post on My Diy Blog (not actually my blog, it's just called that).
C64 OS: C64 OS has one goal. Make a Commodore 64 feel fast and useful in today’s modern world.
C64-Diagnostic-Rev.-586220-Harness: The Diagnostic Rev. 586220 is a widely accepted test tool for the Commodore C64. It tests the RAM, ROMs and the peripheral chips (VIC, SID, CIA). To test all interfaces, a feedback is required. This is provided by this harness.
C64-Wiki (DEU): Das C64-Wiki ist ein Projekt zum Aufbau eines speziellen C64-Lexikons. Jeder kann mit seinem Wissen dazu beitragen. Gute Autorinnen und Autoren sind stets willkommen.
c64-rf-modulator-replacement: C64 Composite/S-Video RF Modulator Replacement. This is my version of a C64 RF Modulator replacement based on the schematics of similar designs like Zero-X/OMS's Modified Commodore RF Modulator Design and JMP$FCE2's S-Video only design. This board can be used to replace a damaged or defective RF modulator in your C64, to improve the sharpness of your video output, or as a modern solution to replace the composite/luma/chroma output functionality of the original modulator on new motherboards such as the SixtyClone or Bwack’s KU-14194.
C64.CH: The C64 Demo Portal.
C64.COM: Welcome to the world of C64 nostalgia. Here you will find exclusive material about the Commodore 64 home computer that we all know and love. There’s detailed information about current and upcoming C64-related events and past developnments within the scene and game culture in general. We at C64.COM aim to save and store an important part of the history of those who played a part in the active era of the Commodore 64. Enjoy your stay!
C64endings.co.uk: Completing the Commodore 64 games you couldn't! On this site you’ll find hundreds of Commodore 64 game endings.
c64sets.com: This site attempts to re-create some of the best Commodore 64 software sets. And by “set” we mean the box, manual, disks and any other materials contained inside the packaging. If you are looking for documentation for some of your favorite Commodore 64 games, then we may just have what you are looking for. Or if you are looking for a trip down memory lane, and you just want to view the materials from your favorite Commodore 64 games - well, hopefully we can help you out there too.
Codebase 64: This wiki is the number one source of articles on Commodore 64 programming. You will find source code, tutorials, manuals, notes on clever tricks and hardware quirks and more!
CommodoreServer: A Centralized Place for All Things Commodore. CommodoreServer is what Commodore computers have been missing for the last three decades. It is the newest, greatest way to look for new games, store your disks, and get your products sold. It's like an app store, but for Commodore computers. Plus, with the ability for your Commodore computer to access the Internet, it provides a single place for socializing and sharing with your friends, downloading software, blogging, and more.
CSDb - The Commodore 64 Scene Database: A site dedicated to gathering as much information as possible about the productions, the groups, the sceners, the events and bbs's in the Commodore 64 scene.
Diagnostic Carts and Manuals - World of Jani: Diagnostic cartridges for the Commodore 64 / 128.
Digital Talk (DEU): Die Digital Talk (aka Digitalk oder DT) ist ein deutschsprachiges Diskettenmagazin für den Commodore 64 und kompatible Systeme (C128/SX-64/ect.) und erscheint seit 1993 (mit einigen Unterbrechungen) bis in die heutige Zeit. Das Magazin ist Freeware und verfolgt keine kommerziellen Absichten - neben der kostenlosen Variante als virtuelles Abbild (d64) zum Downloaden, wird auch eine physische Version auf echter Diskette zum Selbstkostenpreis angeboten.
Edicola 64 (ITA): Raccolta digitale di dump (cassette e dischi) di giochi, software e scansioni che hanno reso celebre questo fantastico computer a 8bit nel nostro paese.
GameBase64: Preservation before Deterioration! Welcome to the GameBase64 site, formed by a team of C64 enthusiasts from all over the world who wish to preserve the memory of their beloved 8-bit computer for the generations to come. We do this by trying to preserve all game software written for the Commodore 64 computer before the deterioration of old 5¼ disks and common cassette tapes erases them for ever.
GameBox 64: Welcome to GameBox 64, a collection of scanned packaging and media for Commodore 64 games. This project aims to be a complete resource for packaging related scans such as instructions, inlays, boxes, tapes, disks, cartridges and other miscellaneous items.
Girls.c64.org: Preserving the sexy side of the Commodore 64.
High Voltage SID Collection: The High Voltage SID Collection (HVSC) is a freeware hobby project which organises Commodore 64 music (also known as SID music) into an archive for both musicians and fans alike. The work on the collection is done completely in the Team and contributors' spare time and is proudly one of the largest and most accurate computer music collections known.
intros.c64.org: World of C64 crackintros.
JaffyDOS: JaffyDOS is a custom kernal for the C64/SX64 with enhancements for SD2IEC.
Kung Fu Flash: Cartridge for the Commodore 64 that packs a punch. Kung Fu Flash can emulate different cartridge types, load PRG files and use D64 disk images. Just place your desired CRT, PRG or D64 files on a FAT formatted microSD card and use the built-in launcher to execute them.
Lemon64: Commodore 64, C64 Games, Reviews & Music!
OpenC64Cart: OpenC64Cart is an Open Hardware Cartridge for the Commodore 64. It only supports 8 KB ROM images.
OpenC64Cart16K: OpenC64Cart16K is an Open Hardware Cartridge for the Commodore 64. It only supports 16 KB ROMs and uses a single (E)EPROM chip.
PLA16V8: The PLA16V8 is a GAL PLA replacement for the Commodore TED series computers (such as the Commodore 16, 116 and Plus/4) that I did design after the succes of the PLA20V8. In a TED based computer, the most common point of failure is the 8501 CPU. Therefore the shortage of PLAs is not as severe as for the Commodore TED computers, it is easier to find an original PLA than for the Commodore 64. That said, the PLA in the Commodore TED series computers can fail and you may want to replace it with a more available component. This is now available. the PLA16V8 is ready to service you!
PLA20V8: The PLA20V8 is a PLA that consists of two GAL20V8B chips from Lattice Semiconductor. The GAL is a programmable logic chip that looks a lot like the original PLA: It has an AND array, followed by an OR array. Depending on the mode of the GAL the signal then can go through a flip-flop, which the PLA does not have, but this flip-flop is bypassed in the so called “simple” and “complex” modes, which makes the chips rather close to a PLA, perhaps the closest possible chips to a PLA you can get. We need two GALs, because we can't fit all the logic in a single GAL.
Ray Carlsen's Home Page: This site is dedicated to users of 8 bit Commodore Computer hardware. The information herein is listed in “directories”. Each directory refers to a particular device such as a C64 computer, and each contains all the repair articles, schematic diagrams, etc. I have for that piece of equipment.
Ready64 (ITA): Ready64 è una mostruosa raccolta e catalogazione di giochi, programmi, interviste, scansioni di riviste, di libri e di tutte le informazioni considerate di valore relative al Commodore 64, che vanno dal recondito passato per giungere fino alle produzioni attuali.
ReplayResources: Originally introduced by Datel Electronics the Action Replay and its' successors Retro Replay and 1541U have become indispensable tools to the C64 community. The Action Replay hardware and it's software was cloned, localised and modified a lot throughout the years - here is the place to gather this specific historic information. This wiki serves the purpose of documenting differences, bugs and extensions, make them available at one place and take some pieces of the software to new grounds. Other multifunction cartridges will be covered here as well, but not as extensively and mainly to exploit feature ideas or to round the overall information.
Scene World Magazine: The most eclectic and the world's only Commodore 64 NTSC & PAL diskmag.
tapecart: The tapecart is a low-cost flash storage device for the Commodore 64's tape port. This repository contains source code and documentation related to it and will one day contain the schematics and layout files too.
Tapuino: The $20 C64 Tape Emulator.
The Brixty Four: Full-size LEGO C64s. Here you can find the world’s only full-size LEGO® Commodore 64! It’s also the only breadbin style C64 replacement case option on the market (compatible with many of the Commodore PCB emulation options too). AND its keycaps are the only C64, C64C or VIC-20 replacements available. Or go plastic-fantastic and add the LEGO mechanical keyboard & PCB to create the ultimate executive desk toy, complete with working LED!
The Dump Club 64: Dedicated mainly to the Commodore 64, The Dump Club 64 is a group of retrocomputing enthusiasts that aims to preserve, catalog and finally share the software of old magnetic media on files. The site in addition to file sharing, does not disdain reviews on games and magazines of the time dedicated to the legendary home computer.
The FPGASID Project: The Mission: Create a pin compatible drop-in replacement for the MOS6581 device as well as for its successor, the MOS8580. The Targets: To-the-cycle exact reproduction of all digital parts including sound and envelope generation and paddle readouts; Exact modeling of the analog parts leading to a result that is almost indistinguishable from the original; Making it configurable to easily switch between various SID variants; Adding extra features like wavetables, stereo sound, more voices etc while keeping full compatibility.
The Ultimate Tape Archive (C64): Welcome to the most complete Commodore 64 cassette archive that exists. By complete, we do not mean it's all the titles ever made, but all tapes are complete with coverscans and manuals all in one place for you to enjoy. We have used Tape Manager V1.3 to organize the content, so that it can easily be used with the NOVA64 front end which also has features to run the images on both emulators and real C64s.
Ultimate-II+ - Ultimate 64: Back in 2008, the idea came up to create a cycle exact floppy disk drive emulation of the Commodore 1541 drive, and embed this emulated drive in a cartridge for the Commodore 64 home computer. Today, the 1541 Ultimate and related products have become indispensable extensions for the Commodore 64 and 128 computers. According to some users, it has completely changed the way they use the old machine as it nearly eliminated the need for real floppy disks.
Versa64Cart: Versa64Cart is designed to be a modern easy-to-use cartridge development board for Commodore 64 and Commodore 128 hobbyists and hackers. The versatile design of the PCB allows for flexible implementation of various cartridge types. Whether it’s a simple cartridge backup of an 8k game or a switchable multi-program diagnostic cartridge, Versa64Cart has you covered.
Zeus LT: A multi-function interface board for the Commodore 64. The Hackability of an Arduino With the Retro Swagger of a C64.
VIC-20 Listings: VIC-20 Listings is an archive of type-in games, utilities and other programs for the Commodore VIC-20 home computer, that were published in various books and magazines during the 1980s. These programs are often overlooked or missing from other collections of retro computer software. There are currently 2,468 programs in the collection. The aim is to make each program available for download together with details of who wrote it, where the listing was published, any special requirements, and brief instructions. Each program is kept as close to the original listing as possible.
VIC Term 300: VICTerm300 is an ASCII Terminal emulator for Commodore VIC-20, written in BASIC so it can run just at 300/600 baud. It's just a slight improvement to a BASIC demo program printed on the VIC-Modem guide.