• https://www.commodore.net/category/all-products
• https://www.retro8bitshop.com/shop/
• https://retrorewind.ca/commodore-64-hardware

• https://retrogameboyz.com/collections/control-pads
• https://retroradionics.com/ArcadeR-9-pin-ATARI-standard-Joystick-With-new-extra-soft-and-durable-cable-p168982750
• https://atari.com/collections/hardware - Look at the CX40+ Joystick and CX78+ Gamepad. Can also be found at Amazon

• DB9 to USB converter for using gamepad/joystick and mouse on C64
  • Warning; compatibility confirmation is pending. Is not yet certain to work with all hardware. Do not buy to enthusiastically
  • https://retrohax.net/shop/modulesandparts/mouster/
• Bundle DB9 to USB converter (Micro Tom) & retro ‘tank mouse’ USB mouse. Do not expect this converter to work for USB joystick or gamepad
  • https://sordan.ie/search/?q=tank+mouse

• Publisher of new C64 games & sale. Also some hardware.
  • https://www.protovision.games
• https://csdb.dk/ - 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.
• https://archive.org/details/softwarelibrary_c64
• https://www.myabandonware.com/browse/platform/c64/
• https://www.c64.com/

More game websites https://www.lemon64.com/links/genre/games-archives

• https://c64os.com
• GEOS – is included in the ‘USB cassette’ and see also the ‘files’ section of the FB-group The Commodore 64 Ultimate Owners Group

• https://assembly64.hackerswithstyle.se/assembly/index.html

• https://store.go4retro.com/commodore/jiffydos-64-ultimate-rom-overlay-image-standard-pack/
• https://store.go4retro.com/commodore/jiffydos-64-ultimate-rom-overlay-image-pro-pack/
• https://e4aws.silverdr.com/projects/dolphindos2/

• https://ide.retrogamecoders.com/?platform=c64&file=hello.bas
• https://stigc.dk/c64/basic/

• https://c64.ch/ - website with demo’s and programming information
• https://retrogamecoders.com/commodore64-basic-programming/ - BASIC Programming Course with video
• https://www.commodore.net/downloads – section ‘documentation’, the C64U user manual
• https://commodore.software/downloads/download/950-c64-programming-reference-books/16041-commodore-64-programmer-s-reference-guide - Commodore 64 Programmer's Reference Guide download

• https://joystickandcursorkeys.github.io/basic64-js/index.html

• https://vice-emu.sourceforge.io/
• https://sourceforge.net/projects/deniseemu/

• https://www.c64-wiki.com – A ‘C64 Wikipedia’
• https://www.computesgazette.com - monthly publication about retro computing
• https://www.lemon64.com/ - active forum
• https://www.reddit.com/r/c64/
• https://www.commodorebbs.com - List of BBS’s (Bulletin board system) that should work with the C64U online functionality

• https://www.youtube.com/watch?v=Ojiitb-Wjog – exploring functionality of C64U https://www.youtube.com/watch?v=AU1Po2Z17kI – use of config files
• https://www.youtube.com/watch?v=QjkSr0mHikI – use and benefit of using JiffyDOS or similar
• https://www.youtube.com/watch?v=IKyL9YU5SS8 – follow up of the JiffyDOS video
• https://www.youtube.com/watch?v=Y20fzD7nRTM – updating firmware of the C64U
• https://www.youtube.com/watch?v=PqqrgDhjOMc – use of REU (extended memory) and overclocking