I 've found a page server dedicated to medieval and renaissance spanish literature. They even have a magazine (Lemir - Literature española medieval y renacimiento). It seems that you can download articles and texts.
http://parnaseo.uv.es (It's a bit slow)

There is also a lot of information if you do a search on the instituto cervantes page with the keyword "medieval".

Thanks for the site. It was helpful.

[ 01-16-2002: Message edited by: CS ]