This page is really an index of other pages containing documentation, because EPICS documentation is distributed between the different parts of the project (and it's not all at the APS site either). In most cases, the documentation associated with a particular part of EPICS is found on the part of this site that is concerned with that part of the code, and the links below will take you to those areas.
A number of different document formats are used, depending on the original author's preferences. Hypertext (HTML) and PDF predominate, but PostScript is also occasionally used.
This document, along with other similar documents, is very specific to the particular release of Base that you want to know about. You'll find a link to it on the page for your Base release in the EPICS Base area.
It's on the Wiki, please update it if you find any parts that need corrections.
The original APS EPICS Documentation page will no longer be maintained or updated. If there are any documents listed there that you will need access to in the future but cannot find in this new documentation area please let me know.