The following books contain additional information about version 5.0 of the ChorusOS operating system that will help you with transition:
The ChorusOS 5.0 Features and Architecture Overview
The ChorusOS 5.0 Application Developer's Guide
The ChorusOS 5.0 Board Support Package Developer's Guide
The ChorusOS 5.0 System Administrator's Guide
The ChorusOS 5.0 Installation Guide
The ChorusOS 5.0 Reference Manuals