Hmmm I used to have the dos version but I don't know where it went. All I can remember is that to play it, I had to use it as a boot disk.
While hunting for it yesterday I saw the same edition that I had on e-bay and it was up to $50, with 2 days left in the auction yet.
I did manage to find a game on Sourceforge called Hunt For Gold which looks like a Pirates! clone. However, it is still a work in progress.
If anyone else is interested, see: http://huntforgold.sourceforge.net/