This book is a a compilation of two manuals that describe the system level components that make up Portfolio: kernel, IO, tasks, filesystem, events, and so on. The following paragraphs briefly describe each manual.

3DO System Programmer's Guide. This manual is a guide to the features of the kernel, IO, filesystem, and so on in the 3DO operating system.

3DO System Programmer's Reference. This manual contains a detailed description of the calls that make up the Portfolio system.