Re: driver development status
Nvidia doesn't disclose information about driver development status and related info. I think you can safely assume that 5 year old cards will work using modern drivers. I don't know for sure why nvidia removed support for TNT cards and early Geforce models. The main reason for it is I think that the hardware works a little different than the latest hardware and that the card support less 3d features which made it hard to support in the latest drivers.