Programming "Arduino" code to AT90S8515? I found (from a previous life) an STK500 and a couple AT90S8515's in the recesses of my basement..  that I would like to put to use.

Is there a way in which I can write "arduino code" for the 8515?  I know that it's basically C/C++.

I also know that the 8515 doesn't have, or support, a bootloader like the Mega series of ICs do..  so I expect that I will need to program it using the STK500.

I downloaded AVR Studio, but I will admit, I became very lost, very quickly.

Thanks for any direction!
Theoretically yes, once you write a core (1.5.x/1.6.x) for it. I'm not sure if the IDE has a configuration for the STK500, but it should be easy enough to add (since avrdude already supports it).