This book covers the hardware interface to the AmigaOS. There are interfaces for every aspect of the AmigaOS including the Game Port, Audio, Console, Keyboard, Parallel, SCSI, Serial, Timer, TrackDisk, and other devices. The IFF (Interchange File Format) is detailed. Also covered is some information about the physical layout of the floppy, RigidDiskBlock, and Amiga Bootstrap. This book is great for AmigaOS system programmers needing to communicate at the hardware level or OS designers needing hints about Amiga hardware aspects. This book is also excellent for presenting a well thought out I/O interface for acessing the hardware and organinzing drivers.