Custom page listing all posts in a category

Hi,

I am trying to create a custom page with a list of all posts in a category by Title.

Several years ago, I followed a tutorial I found on the web that explained how to duplicate and modify the page.php file but I noticed Atahualpa doesn't have this file.

The template I had previously created simply listed all of the post titles for currently published posts in a category but at some point I must have misplaced it when upgrading.

How might I accomplish this with the current version of Atahualpa?

Thanks a bunch!

Michael