hey. your story intrigued me, so i found it and hosted it somewhere more free. Its quite rare these days. It doesn't work in Dosbox on OSX unfortunately so I couldn't see it.
This is:
echo Magic Mushroom
Echo --------------
echo This Program was made by the R&D Team at
echo the Cleveland Corp. of Australia at Hendra
echo To turn 'Magic Mushroom off press any key
echo Bye,Bye,Bye
It may not work in dosbox, but mushroom.ovl is just raw 8-bit[1] linear audio sampled at 8kHz so you can load it up in your raw-audio-capable app of choice. On linux try "aplay mushroom.ovl", for example.
[1] Actually only 6 bits per byte are used; presumably this was done to improve decoding speed or something.
The result is 6 bits of resolution, along with a high pitched squeak during playback, depending on the output circuitry and speaker characteristics (it's less noticeable when a low-pass filter is added).
This is: echo Magic Mushroom Echo -------------- echo This Program was made by the R&D Team at echo the Cleveland Corp. of Australia at Hendra echo To turn 'Magic Mushroom off press any key echo Bye,Bye,Bye
virus total scan (its clean): https://www.virustotal.com/en/file/34b703cace0a2464899c67fa1...
Because its so small (206K), it fits in a pastebin: curl http://pastebin.com/raw/D95mhEvE | base64 -D > mushroom.zip