No need to get the CD. The roms for all the original games are available (for example on Atarimania). You can convert them to wav using the "makewav" utility, or play them directly (without generating a file) out of the soundcard with "Playbin".
The "makewav" archive contains sources that you can use to build a linux executable. Playbin is windows only, but works fine in Linux using wine.
I suggest to use an adapter when connecting the Supercharger to stereo equipment like a CD player or the PC soundcard, as the mono plug shorts the right channel to ground and not all devices might be designed to safely handle that.
I built mine using a short cable, an in-line female mono socket and a male stereo plug. Only the left channel and ground are connected between the two; the right channel of the plug is left disconnected.