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The SCSI Manager is the part of the Mac OS that controls the transfer of data between a Macintosh computer and peripheral devices connected through the Small Computer System Interface (SCSI). In 1993, Apple Computer introduced SCSI Manager 4.3, an enhanced version of the SCSI Manager that provides new features as well as compatibility with the original version.

Technotes TN1116: PowerBook HD Upgrades and SCSI disk mode Compatibility Q&As     Inside Macintosh: Devices (Chapter 4 - SCSI Manager 4.3) (Chapter 3 - SCSI Manager) This book describes how to write software that interacts with built-in and peripheral hardware devices. This book provides useful information for writing and debugging low-level software. Chapter 4 of Inside Macintosh: Devices is the fundamental reference for SCSI Manager 4.3, which is the current version of the SCSI Manager. Chapter 3 of Inside Macintosh: Devices describes the original version of the SCSI Manager. Designing PCI Cards and Drivers for Power Macintosh Computers, Revised Edition [PDF] This book describes the Macintosh implementation of the Peripheral Component Interconnect (PCI) local bus, a high-performance interconnection for expansion cards, integrated I/O controller ICs, and the computer’s main memory and processor. This book contains useful information for developers who are designing PCI expansion cards and their associated software. Chapter 15 discusses the requirements for writing native driver code to support SCSI devices on PCI cards in the second generation of Power Macintosh computers.