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The Slot Manager allows an application or a device driver to identify NuBus expansion cards and communicate with the firmware on a card. You need to use the Slot Manager only if you are writing an application or a device driver that must address a NuBus expansion card directly. Note: For PCI-based Macintosh computers, the Name Registry replaces the Slot Manager for most operations.

Technotes Q&As     Inside Macintosh: Devices (Chapter 2 - Slot 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 2 of Inside Macintosh: Devices is the fundamental reference for the Slot Manager.