Huh? What is this? Yep, This is TinyJSid 0.78, a SID decoder,
written in Javascript, copyright 2013 by Juergen Wothke,
licensed under Apache License, Version 2.0,
based on Tiny'R'Sid (http://www.wothke.ch/tinyrsid/),
compiled to Javascript by using "emscripten"

What is SID?! SID Music File for MOS Technology SID Soundchip 6581,
which was used in Commodore C64 an C128 in the 1980s).

You are not a friend of Javascript and you want a version in good old C ?!
Have a look a my modified version of TinySID sid2pcm,
a linux console util to decode sid files to raw pcm at stdout,
pipeable to aplay (alsa) or pacat (pulseaudio), ffmpeg or to file...
sid2pcm contains sidengine.c from T. Hinrich (kebby.org)
and code from TinySID 0.94 by R. Sinsch

Here you can find all sid Files used by this website.

You're interested in technology behind SID?
right here is my mirror of some tech files.