DOS Games Discussion

I am looking for some information on the game Das Boot. I have the game and a sheet to tell what buttons do what. However, I am trying to find some background information for a talk I am doing at the end of the month.

Thanks

http://www.subsim.com/ssr/simhist.html
http://www.goodolddays.net/0_0_0_0_0_0_ ... ow_1__0_0/

Tnak you.