What sub sims can I play using old ATI Radeon Xpress 200 (RS480)?

[Songmaster]

Hi all,
I'm brand new to this forum and I searched . . . or at least tried to . . . for some submarine simulation games which I can play using my ATI Radeon Xpress 200 (RS480) video card--however, the search function wouldn't accept 3 character search terms. Most of the sims I looked at required more than that, but before I go out and buy another card, I thought I'd see what old games might be available which my card could handle.
My computer is a Compaq Presario, running an AMD Sempron 3400+ processor with 2.5G RAM, Windows XP Home Edition.
If there is a thread already running about video cards, please direct me to it, as I was unable to find it so far.

Eventually, of course, I'll buy a better video card which supports the 3D acceleration, but funds are in short supply at the moment.

Thanks in advance for any help,
~SongMaster~