Listen to your favourite radio stations on your Commodore. Timo Voutilainen connected a RDA5807 FM Radio module to the user-port of the Commodore 64. The module uses only 6 connections: GND, +5V, DAT, CLK and 2 for the audio. Timo also has written a program that controls the FM Radio.
Website: http://tinyurl.com/bmozvv6
Source: http://www.richardlagendijk.nl