One question that needs to be asked is what version of doom you wish to run:

If it is one of the old ones (Doom I or II), then legacy will probably work fine with an older video card (I believe it has some acceleration on newer cards, but the geforce is probably more than enough).  All you need to do is get a copy of the game you want to play, so you can get the WAD (Doom data file) from it, and then you can use the linux engine to play it.  If you arent sure if it will run, you can download the Doom I shareware WAD (just search on google, it is legal to download) and see if that works on your computer.

Doom III was officially ported to linux, so if you want to play that then you just need to get a copy of the retail game, and then download the Linux binaries from ID.  For that though, you will definately need a pretty beefy system and video card.

In general though, it really depends on the game you are interested in.  Some newer games (such as Quake 4 and Unreal Tournament 200x) have been ported to linux, but other games such as Halo havent.  The reason that there are so many Doom engines available for linux is that ID open-sourced the code a while back.  You might even want to check out some native linux games, such as SuperTux.  The linux game tome (at http://www.happypenguin.org/) is probably a good start.

Best of luck,
Matt

On 5/5/06, Michael < bmike101@cox.net> wrote:
so what do I do... download the doomlegacy software and then buy..... just the
standard doom software? Does this mean that every game that has an engine can
be played on Linux? If that is so it looks as if it may be time for a new
video card. Or else is a geforce 256 SDR going to work for me? The only
reason I haven't been playing games is because I thought  I needed special
software AND a video card.

On Thursday 04 May 2006 13:38, Dan Lund wrote:
> Doom is available on Linux in half a zillion different carnations.
> http://linuxreviews.org/games/doom/
> Brief rundown.
>
> --Dan
>
> On 5/3/06, Michael <bmike101@cox.net > wrote:
> > Hi guys..... I have a friend who wants to play doom with me. Can I get it
> > for Linux?
> >
> > or
> >
> > He's offered to make me a windows box. That means buying another nic for
> > it and one for the linux box. Could you point me to some documentation
> > for creating a firewall on the linux box or could I just put a splitter
> > on the usb cable and run it to the windows box?
> >
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