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About This Developer Note

This developer note is a technical description of the new PowerBook computer , with the emphasis on the features that are new or different from those of earlier PowerBook computers.

This developer note is intended to help hardware and software developers design products that are compatible with the Macintosh products described here. If you are not already familiar with Macintosh computers or if you would like additional technical information, you may wish to read the supplementary reference documents described in this preface.

Contents of This Note

The information in this note is arranged in five chapters and an appendix.

• Introduction introduces the new PowerBook computer and describes its features.
• Architecture describes the internal logic of the computer, including the main ICs that appear in the block diagram.
• Devices and Portsdescribes the standard I/O ports and the built-in I/O devices.
• Expansion Features describes the expansion features of interest to developers. It includes development guides for expansion-bay devices, the RAM expansion modules, and the PC Card slot.
• System Software describes the system software that comes with the computer, with emphasis on the new Open Firmware features.
• Abbreviations is a list of the abbreviations used in this developer note.