Dtvexbus1
D. Garmon has a great how-to on making a 3D & joystick controller for DTV/Commodore 64. Source and schematics on the details page –

The DTVii is a wireless tilt controller and joystick for Commodore 64 compatible computers. The parts for the project are fairly common and were not terribly expensive. A pair of Atmel AVR microcontrollers, each coupled with a transmitter and receiver form the core.

DTVii project page – [via] Link.

Related:

  • Commodore 64 emulator for the PSP – Link.
  • NI Traktor MIDI controller in a C64 case – Link.
  • Teeny Tiny Commodore 64 – Link.
  • C64 USB keyboard – Link.
  • Adding Ports and Power to the C64 DTV – Link.

From the pages of MAKE:
Make 496

Hacking the C64 DTV. Retro-gaming joystick easily converts into full Commodore computer emulator. MAKE 02 – page 149. Subscribers–read this article now in your digital edition or get MAKE 02 @ the Maker store.