Apple manual PowerBook Duo 250 Computer Features

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C H A P T E R 1

Introduction to the PowerBook Duo 250 Computer

The Macintosh PowerBook Duo 250 computer is a member of the PowerBook Duo family of computers. It has all the basic features of the PowerBook Duo computer but also has certain new features which are described in this note. These features include

an active-matrix (AM) 16-level grayscale display

a 200 MB hard drive

an inverter/speaker board that is compatible with both film super-twist nematic (FSTN) and AM displays

The computer uses the same 33 MHz 68030 microprocessor as the PowerBook Duo 230 computer. Chapter 2, “Hardware Modifications,” describes the modifications made to the original PowerBook Duo computer to implement the PowerBook Duo 250 computer. Chapter 3 describes the software modifications.

This note is a supplement to the Macintosh Duo System Developer Note, R0457LL/A, which contains detailed information about the basic Macintosh PowerBook Duo computer.

PowerBook Duo 250 Computer Features

Features of the PowerBook Duo 250 computer are listed below. Items in boldface type are unique to the PowerBook Duo 250 computer, and are described in more detail

later in this note. All other items are discussed in detail in the Macintosh Duo System Developer Note.

main processor: 33 MHz 68030 microprocessor

main system controller (MSC): controls DRAM, ROM, built-in I/O, sound, and some power-saving features

Power Manager: a custom microcontroller that provides intelligent power management

integral hard disk: 120 MB or 200 MB capacity

4 MB of DRAM on the main logic board

DRAM connector: accommodates 4 MB or 8 MB Apple DRAM expansion card, expanding system DRAM capacity to 8 MB or 12 MB; third-party developers using 15-Mbit DRAMs and current packaging techniques can design a card that expands DRAM capacity up to 24 MB

1 MB of ROM: stores system and configuration data.

active-matrix 16-level grayscale display

video components: a gray-scale controller chip (GSC) and video RAM; the GSC controls the interface between the processor, the Video RAM, and the display; the VRAMs store the data required to write and refresh the display

inverter/speaker board compatible with both FSTN and AM displays

Combo chip: includes the Serial Communication Controller (SCC) and Small Computer System Interface (SCSI) controller

2PowerBook Duo 250 Computer Features

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Contents PowerBook Duo Limited Warranty on Media and Replacement Contents Page Figures and Tables Page About This Note Conventions Used in This NoteOther Reference Material LCDFor More Information ApdaPage Introduction to the PowerBook Duo 250 Computer PowerBook Duo 250 Computer Features Main expansion connector Page Hardware Modifications Active-Matrix Display Features Inverter/Speaker Board MB Hard Disk DriveHousing Requirements Environmental Specifications1Hard disk drive housing Hardware Modifications Bracket for the hard disk drive Hard Disk Interface Interface RequirementsGND Terminator Power Requirements Startup Not Applicable Random Operation Idle StandbySoftware Modifications PowerBook Duo 250 Control Panels PowerBook Setup PanelPowerBook Control Panel Custom and Easy Controls for Battery ConservationPower Conservation Index X, Y, Z
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