Hardware

Cable XE1541
Instructions to make a cable that connects a 1541 drive to the LPT port of a PC. Meant to be a substitute for the original X1541, according to the differing parallel port specifications of the new motherboards.
http://www.geocities.com/vteramos/Paginas/XE1541en.html

CD-64
Tutorials on how to build an X1541 cable and how use a Zip drive with a C64, CMD info, games, and utilities.
http://www.geocities.com/cdsixfour/index.htm

Commodore DTV Hacking
Documents hardware modifications for the series of Commodore DTV gaming joysticks.
http://galaxy22.dyndns.org/dtv/

Commodore One
Commodore compatible re-configurable computer designed by Jeri Ellsworth. C64 and VIC-20 cores are available to download.
http://c64upgra.de/c-one/

C=VGA Adaptor
Abandoned project to build a card that connects a Commodore computer to a VGA monitor.
http://www.commodorescene.servebbs.org/vga.html

CyberpunX Retro Replay Cartridge
Retro Replay cartridge manuals, ROMs, and hardware information.
http://rr.c64.org/

The Final Ethernet cartridge
Ethernet adaptor for the Commodore 64.
http://dunkels.com/adam/tfe/

The Final Replay
ROM image to be used with the Retro Replay cartridge and the RR-Net ethernet adapter. An attempt to combine the advantages of the two major cartridges for the C64, the FC3 and AR6.
http://www.oxyron.de/html/freplay.html

64HDD
Home of the CBM hard disk emulator 64HDD and other Commodore projects.
http://www.64hdd.com/

Heaven's Keeper
Fit a Commodore 64 into a PC tower. Hardware description plus pinout.
http://heavenskeeper.150m.com

The IDE64 Project
Cartridge interface for connecting IDE hard disk drives, CD-ROMs and other ATAPI devices to the Commodore 64 computer.
http://www.ide64.org/

Michael Klein's Projects
Features instructions for adding 8K RAM expansion to the 1541 and cbm4linux, a Linux kernel module to use disk drives and printers with the C64 and VIC-20.
http://www.lb.shuttle.de/puffin/

The MMC2IEC device
Transfer data between a PC and a C64 by simulating a 1541 disk drive using the IEC bus and accessing data from a SD/MMC flash memory card. Includes descriptions of the hardware and software.
http://pontoppidan.info/lars/index.php?proj=mmc2iec

Picodore 64 - a Commodore 64 PDA
Constructed with a Commodore 64 DTV, Radio Shack "Hummer Off-Road Racing" DTV, PSOne screen, and Jornada foldaway keyboard.
http://www.picobay.com/projects/2007/01/picodore-64-commodore-64-pda.html

retrohackers.com
Hardware and software news for the Commodore retro-hacking community.
http://retrohackers.com/

1541 Serial Interface Project
Connect a PC to a Commodore disk drive using the standard floppy cable, the interface, and a serial cable. The only thing needed on the PC side is a free serial port.
http://www.bitcity.de/1541%20Serial%20Interface.htm