Roche 454 technology, which uses emulsion PCR amplification on beads followed by  Pyrosequencing  (see below) is available on this site: 

http://454.com/products/technology.asp

The following video is interesting but there is no explanation in the audio track  

<iframe width="560" height="315" src="https://www.youtube.com/embed/KzdWZ5ryBlA" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>

Pyrosequencing video :