The C64 – Pi Interface gives you the capability to connect your Commodore 64 to an HDMI monitor, using a Raspberry Pi. This project is experimental, and not intended to be used as an end-user product.
 
This project is inspired by the RasPIC64 project but with different goals in mind:
Focus on both video and audio
Eliminate the need for any addition connections to the C64 besides the Expansion Port
Use the Pi’s SMI bus and DMA for efficient data transfer
Support Raspbian, no bare metal OS