P R E F A C E

About This Note

This note is a supplement to the Macintosh Developer Notes, Number 2, Macintosh Duo System, APDA publication number R0457LL/A. It describes the design features of the PowerBook Duo 250 computer, which is basically a PowerBook Duo computer with an active-matrix display and expanded hard disk capabilities.

This note provides the hardware or software developer with the additional information needed to design hardware and software elements for the PowerBook Duo 250 computer. This publication assumes you are familiar with the functionality and programming requirements for Apple Macintosh computers. It consists of three chapters

Chapter 1, “Introduction to the PowerBook Duo 250 Computer”

Chapter 2, “Hardware Modifications”

Chapter 3, “Software Modifications”

It also contains an index.

Conventions Used in This Note

This developer note uses the following conventions:

Note

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IMPORTANT

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W AR N I N G

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A slash in front of a signal name (/RESET) indicates an active low signal.

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Apple 250 manual About This Note, Conventions Used in This Note