Apple 250 User Manual



Developer Note

PowerBook Duo 250



Developer Press
© Apple Computer, Inc. 2000

Apple Computer, Inc.



© 2000, Apple Computer, Inc.
All rights reserved.

No part of this publication may be
reproduced, stored in a retrieval system,
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Apple Computer, Inc. Printed in the
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No licenses, express or implied, are
granted with respect to any of the
technology described in this book.
Apple retains all intellectual property
rights associated with the technology
described in this book. This book is
intended to assist application
developers to develop applications only
for Apple Macintosh computers.

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Contents

Figures and Tables v

Preface

Chapter 1

Chapter 2

About This Note

Conventions Used in This Note vii
Other Reference Material viii
For More Information ix

vii

Introduction to the PowerBook Duo 250 Computer

PowerBook Duo 250 Computer Features 2

Hardware Modifications

Active-Matrix Display Features 6
Inverter/Speaker Board 7
200 MB Hard Disk Drive 7

Environmental Specifications 8
Housing Requirements 8
Hard Disk Interface 11

Interface Requirements 11
SCSI Connectors 11
Terminator 13

Power Requirements 14

5

1

Chapter 3

Software Modifications

PowerBook Duo 250 Control Panels 16

PowerBook Setup Panel 16
PowerBook Control Panel 17

Custom and Easy Controls for Battery Conservation 17
Power Conservation 18

Index

19

15

iii

1

5

15

Figures and Tables

Chapter 1

Chapter 2

Chapter 3

Introduction to the PowerBook Duo 250 Computer

Figure 1-1

Simplified block diagram of the PowerBook Duo 250
computer system 3

Hardware Modifications

Figure 2-1
Figure 2-2
Figure 2-3

Table 2-1
Table 2-2
Table 2-3

Table 2-4
Table 2-5
Table 2-6

Hard disk drive housing 9
Bracket for the hard disk drive 10
200 MB hard drive SCSI connector 11

Active-matrix display features 6
Environmental specifications for 200 MB hard disk drive 8
Hard disk SCSI connector signal assignments: SCSI

and power 12
Hard disk SCSI connector signal assignments: SCSI ID 13
SCSI ID encoding 13
Power requirements for the 200 MB hard disk drive 14

Software Modifications

Figure 3-1
Figure 3-2

PowerBook Setup panel 17
PowerBook Control Panel 18

v

▲

PREFACE

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 0

This developer note uses the following conventions:

Note

A note like this contains information that is interesting but not essential
for an understanding of the text.

IMPORTANT

A note like this contains information that is essential to an
understanding of the text and of the equipment or software described.

WARNING

A note like this directs your attention to something that could cause
injury to staff, damage to equipment, or loss of data.

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

◆

▲

▲

vii

µ

PREFACE

The following abbreviations are used in the book:

AM active matrix

DRAM dynamic random access memory

FSTN film super twist nematic

I/O input/output

K 1024

LCD liquid crystal display

mA milliampere

MB megabyte

Mbit megabit

MHz megaherz

mm millimeter

ms millisecond

s microsecond

ns nanosecond

RAM random-access memory

RMS root mean square

SCC serial communication controller

SCSI small computer system interface

VRAM video RAM

V volts

When unusual abbreviations appear in this developer note, the corresponding
terms are also spelled out. Standard units of measure and other widely used
abbreviations are not spelled out.

A distinction is made between boards and cards. Boards are a permanent part
of the computer or expansion device. Cards may be inserted into the system
and can be added or exchanged.

Other Reference Material 0

Related documentation includes:

Macintosh Developer Notes, Number 2, Macintosh Duo System, APDA

■

publication number R0457LL/A

■

Guide to the Macintosh Family Hardware, second edition

■

Designing Cards and Drivers for the Macintosh Family, third edition

Inside Macintosh, Volumes I through VI

■

Macintosh Classic II, Macintosh PowerBook Family, and Macintosh Quadra

■

Family Developer Notes, APDA publication number R0I43LL/A.

viii

PREFACE

For More Information 0

APDA is Apple’s worldwide source for over three hundred development
tools, technical resources, training products, and information for anyone
interested in developing applications on Apple platforms. Customers receive
the quarterly APDA Tools Catalog featuring all current versions of Apple
development tools and the most popular third-party development tools.
Ordering is easy; there are no membership fees, and application forms are not
required for most of our products. APDA offers convenient payment and
shipping options, including site licensing.

To order products or to request a complimentary copy of the APDA Tools

Catalog , contact

APDA
Apple Computer, Inc.
P.O. Box 319
Buffalo, NY 14207-0319

Telephone [phone] (United States)

800-637-0029 (Canada)
716-871-6555 (International)

Fax [phone]

AppleLink APDA

America Online APDA

CompuServe 76666,2405

Internet [e-mail]

ix

Figure 1-0
Listing 1-0
Table 1-0

CHAPTER 1

Introduction to the PowerBook Duo 250 Computer 1

CHAPTER 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 1

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

2

PowerBook Duo 250 Computer Features

CHAPTER 1

Introduction to the PowerBook Duo 250 Computer

■

sound: enhanced sound chip supports 8-bit monaural sound input and output

■

integral microphone and speakers

modem: internal modem/fax card

■

keyboard: integral full-function keyboard with trackball

■

■

I/O: one 152-pin connector for expansion devices, one mini-DIN 8-pin serial port, one
modem port, and a power connector

■

NiCad battery: three-hour removable and rechargeable battery

Figure 1-1 shows a simplified block diagram of the PowerBook Duo 250
computer system.

Figure 1-1

Communication

Fax/modem
SCC interface
SCSI capability

Simplified block diagram of the PowerBook Duo 250 computer system

Main expansion connector

Provides access to:
Duo Floppy Adapter
Duo MiniDock
Duo Dock

Memory and storage

4MB DRAM
Up to 32 MB DRAM expansion
160 MB or 240 MB hard disk

Processing
and control

68030 33 MHz microprocessor
Main system controller (MSC)
Power Manager
Video control
Sound control
System ROM
Integrated FPU

Human
interface

Active-matrix 8-bit or 16-bit
color display
Keyboard
Trackball
Microphone and speaker

PowerBook Duo 250 Computer Features

3

Figure 2-0
Listing 2-0
Table 2-0

CHAPTER 2

Hardware Modifications 2

CHAPTER 2

Hardware Modifications

This chapter describes hardware features of the PowerBook Duo 250 computer that make
it different from the Macintosh PowerBook Duo computer. These features include

■

the active-matrix display

the inverter/speaker board

■

the 200 MB hard disk drive

■

Active-Matrix Display Features 2

The PowerBook Duo 250 display is an active-matrix liquid crystal display. It meets the
same form factors as the basic PowerBook Duo display, so no modifications are required
to the computer housing. Each pixel in the active-matrix display’s 640 x 400 pixel array is
controlled by a unique transistor, for a total of 256,000 transistors. The standard display
mode is black characters on a white background, simulating the look of a printed page.

With its high contrast ratio of 30: and response time of approximately 60 milliseconds, the
PowerBook Duo 250 display provides performance similar to that of a CRT video display,
with no cursor smearing or cursor submarining. Table 2-1 lists the features of the
active-matrix display.

Table 2-1

Feature Description

Active-matrix display features

Display matrix 640 x 400 pixels

Active pixel area 192 mm x 120 mm

Display area 199 mm x 127 mm, including black stripe outline

Standard display mode Black image/characters on white background

Contrast ratio 30:1 minimum

Pixel pitch 0.3 mm square, with black strip between pixels

to increase contrast

Pixel on/off switching speed or

60 ms typical

response time

Gray scale 16 levels

6

Active-Matrix Display Features

▲

CHAPTER 2

Hardware Modifications

Inverter/Speaker Board 2

WARNING

You should not open or modify any of the circuitry associated with the
inverter/speaker board.

The PowerBook Duo 250 active-matrix display is assembled into the
clamshell housing in a clean room environment. Opening up the
equipment in any other environment could cause damage to the unit.

The high-voltage inverter/speaker board may pose a risk if you are
handling the board.

The LCD display is susceptible to damage from electrostatic
discharge (ESD).

The inverter/speaker board is located in the clamshell housing, directly under the LCD.
It interfaces between the basic CPU and the active-matrix LCD display and performs the
following basic functions for the PowerBook Duo 250 computer:

▲

■

It converts the DC power supplied by the computer’s battery to the AC power
required to drive the cold cathode fluorescent lamp (CCFL), that provides the back­lighting for the active-matrix LCD display. Typical CCFL drive power is 400 VRMS
(voltage root mean square) at 3mA, with maximum output of 2000 V peak to peak
at 6 mA.

It provides pass-through circuitry for the data and timing signals, supplied by the GSC

■

to the LCD display, and for the +5 V from the power supply.

It converts the DC voltage supplied by the computer’s battery to the +13 VDC level

■

required for the LCD bias/contrast voltage, which is typically +13 V at 30 mA.

The board is also used in basic PowerBook Duo computers to convert the battery­supplied DC power to the +28V DC level for the LCD bias/contrast voltage required
by the film super-twist nematic LCD display.

200 MB Hard Disk Drive 2

This section describes the 200 MB hard disk drive. It includes the following information
about the drive:

environmental specifications

■

■

housing requirements

■

interface requirements

Inverter/Speaker Board

7

CHAPTER 2

Hardware Modifications

Environmental Specifications 2

Table 2-2 provides a summary of environmental specifications for the 200 MB hard
disk drive.

Table 2-2

Category Condition Specification

Temperature of ambient
air inside a low airflow
thermal chamber,
non-condensing

Temperature gradient Operating:

Relative humidity Operating:

Altitude Operating:

Environmental specifications for 200 MB hard disk drive

Operating limits:

Nonoperating
and storage:

Non-operating:

Non-operating:

Shipping:

5 to 55 degrees C

-40 to 60 degrees C

20 degrees C per hour

Below rate causing condensation

10–90%, noncondensing, maximum
wet bulb 20 degrees C

Noncondensing, maximum wet bulb
35 degrees C

–200 to 15,000 feet

–200 to 15,000 feet

Housing Requirements 2

The PowerBook Duo 250 computer accommodates either a 120 MB or a 200 MB hard disk
drive. The hard disk drive is housed in the PowerBook Duo 250 clamshell housing.
Mounting and installation requirements for the 120 MB drive are exactly the same as the
requirements described in Chapter 3 of the Macintosh Developer Notes, Number 2,

Macintosh Duo System .

The 200 MB drive is mounted in the same way as the 120 MB drive but has slightly
different dimensions. Figure 2-1 shows the dimensions of the 200 MB hard disk. The
height of the disk drive is critical, and it must not exceed 0.75 inches. The drive may be
mounted through either side-mounting or bottom-mounting holes machined into the
disk drive housing. A bracket, shown in Figure 2-2, is attached to the side of the hard disk
and holds it in place in the PowerBook Duo 250 computer housing.

8

200 MB Hard Disk Drive

CHAPTER 2

Hardware Modifications

8 Pin J2

Pin 1

Vacant row in

50 pin connector

Pin 1

40 Pin J1

SCSI

Position 17

(key)

0.387" ± 0.012"

(9.83 ± 0.30mm)

Connector position

Figure 2-1

End view

1

Hard disk drive housing

Bottom view (PCB side)

1.375" ± .015"

(34.93 ± 0.38mm)

PCB
connector

C

L

2

0.079" (2.00mm)
Connector envelope

Side view

4.000" (101.60mm) maximum

1.500"

(38.10mm)

PCB
controller

2.759"

(70.01mm)

2.430"

(61.72)

Bottom mounting holes
M 3.0 (4x)

0.750"
(19.05mm)
maximum

1.375" ± .015"

(34.93 ± 0.38mm)

Notes:

1. All dimensions in inches (mm).

2. Tolerances (unless otherwise noted): .XX = +/-0.25mm (.XXX = +/- .010 inches).

Key:

1

Connector position from edge of drive to center line of first connector pin (39).

2

Connector envelope does not include flex cable or mating receptacle. Connector pins
are to be flush with drive envelope dimensions.

1.500"

(38.10mm)

0.118" (3.00mm)

0.00

Side mounting holes
M 3.0 (4x)

200 MB Hard Disk Drive

9

CHAPTER 2

Hardware Modifications

0.188"

(4.795±0.125mm)

0.125"

(3.20mm)

(1.60mm)

0.192"

(4.900±0.125mm)

3x 0.307"
(7.80mm)

0.137"

(3.50mm)

Figure 2-2

0.082"

(2.10mm)

0.165"

(4.20mm)

Bracket for the hard disk drive

2.874"

(73.00mm)

1.5"

3

2.598"

0 0.125"

(3.200mm)

3x 0 0.118"

(33.00mm)

2

2x R full

(38.10mm)

3x 0.137"

(3.50mm)

3x 0.275"

(7.00mm)

(66.00mm)

(1.00mm)

0.549"

(13.95mm)

(3.00mm)

1.299"

1

4x R

0.039"

C

L

2x R 0.059"
(1.50mm)

6x R 0.059"
(1.50mm)

2x 0.079"
(2.00mm)

0.299"
(7.60mm)

Key

(8.60)

3x R 1.00

(7.80)

Notes:

1. Interpret dimensions and tolerances per
ANSI Y14.5M-1982

2. Material: CRS 1010-1020, 1.00 ± 0.05 (.0394 ± .0020) thick.

3. Finish: Zinc pre-plate per Mil.Spec. QQ-Z-325a Class 3 (0.00020) type II.

4.

Maximum burr allowance is 15% of material thickness.

5. Tooling required to make this part to be property of Apple Computer, Inc. and
shall be permanently marked with Apple’s name and appropriate part number.

6. All dimensions apply after finish.

1

This surface to be free of burrs
and sharp edges.

2

Mark part number, rev level,
vendor I.D., and date code
with 0.19±0.06 high
permanent contrasting
characters.
Locate where shown.

3 Arrow indicates direction of

material grain.

10

200 MB Hard Disk Drive

CHAPTER 2

Hardware Modifications

Hard Disk Interface 2

This section describes the interface requirements for the 200 MB hard disk drive. It
provides specifications and signal assignments for the SCSI connector.

Note

The interface requirements for the 120 MB hard disk drive are described
in Chapter 3 of the Macintosh Developer Notes, Number 2, Macintosh

Duo System .

Interface Requirements 2

The interface to the hard disk is an ANSC X3T9.2 SCSI interface. It implements the Apple
SCSI command protocol and diagnostic command set. The buffer size supports a 1:1
interleave. The drive supports the SCSI asynchronous information transfer. The transfer
rate is 1.5 MB per second (minimum). An embedded controller provides error recovery
algorithms, which include error check and correction (ECC), seek retry, head offset (for
open-loop systems), and defect management. The SCSI interface provides
hardware-detectable SCSI ID.

◆

SCSI Connectors 2

The 200 MB disk drive SCSI connector comprises two segments, as shown in Figure 2-3.
The first segment has 40 pins, arranged in two rows. It transfers SCSI signals between the
CPU and the hard disk drive, and it also supplies power to the drive. The second
segment of the connector accommodates the SCSI ID.

Figure 2-3

Pin 39 Pin 1

Pin 40 Pin 2

200 MB hard drive SCSI connector

SCSI commands and power SCSI ID

Pin 7 Pin 1

Pin 8 Pin 2

Key

200 MB Hard Disk Drive

11

CHAPTER 2

Hardware Modifications

Table 2-3 lists and describes the interface signals for the 40-pin segment of the connector.

Table 2-3

Pin Signal name Description

Hard disk SCSI connector signal assignments: SCSI and power

1, 2 +5V logic +5 V power supply

3, 4 Logic return +5 V return

5, 7, 9, 11, 13,

GND Ground
15, 19, 21, 23,
27, 31, 35

6 /DB0 Data bus bit 0

8 /DB1 Data bus bit 1

10 /DB2 Data bus bit 2

12 /DB3 Data bus bit 3

14 /DB4 Data bus bit 4

16 /DB5 Data bus bit 5

17 KEY Not connected; used as connector key

18 /DB6 Data bus bit 6

20 /DB7 Data bus bit 7

22 /PARITY Data bus parity

24 TERM PWR Terminator power; pulls up termination resistors for

all signal lines

25 /ATN Attention indicator

26 /BSY Busy signal

28 /ACK Acknowledge (handshake signal); asserted in

response to a request for access (/REQ)

29 /RST SCSI bus reset

30 /MSG Message phase

32 /SEL SCSI select

33 /I/O Controls the direction of data movement: when this

signal is low, data is output from the disk drive;
when it is high, data is input

34 /C/D Indicates whether data or control signals are on the

SCSI bus: when this signal is low, data is on the bus;
when it is high, control signals are on the bus

36 /REQ Access request; the CPU asserts this signal to

request access to the hard disk

37, 38 MOTOR RET Return for +5 V power supply for motor

39, 40 +5V MOTOR +5 V power supply for the motor

12

200 MB Hard Disk Drive

CHAPTER 2

Hardware Modifications

Table 2-4 lists and describes the interface signals for the 8-pin segment of the connector.

Table 2-4

Pin Signal name Description

Hard disk SCSI connector signal assignments: SCSI ID

1, 2, 3, 4, 8 Unused These pins are not used and are not connected

electrically to the CPU

5 /ID1 SCSI ID 1

6 /ID2 SCSI ID 2

7 /ID4 SCSI ID 4

The internal hard disk is assigned a SCSI ID number (0–7). Pins 5-7 on the SCSI connector
are encoded and allow the CPU to select the appropriate device. Table 2-5 shows how the
ID signals are encoded.

Table 2-5

ID1: Pin 5 ID2: Pin 6 ID4: Pin 7 SCSI ID

SCSI ID encoding

High High High 0

Low High High 1

High Low High 2

Low Low High 3

High High Low 4

Low High Low 5

High Low Low 6

Low Low Low 7

Terminator 2

The hard disk has 1000-ohm termination resistors for all I/O signal lines. The lines are
pulled up to through the resistors to termination power.

200 MB Hard Disk Drive

13

CHAPTER 2

Hardware Modifications

Power Requirements 2

Power drawn for the 200 MB hard disk must be less than or equal to values shown in
Table 2-6 for each mode. All measurements are under nominal environmental and
voltage conditions. The limits include 1000-ohm pull-up resistors on all signal lines.

Table 2-6 Power requirements for the 200 MB hard disk drive

Current (amps) Power (watts)

Mode

Startup (1) Not

Random

Mean Maximum Mean Maximum

applicable

1.30 Not
applicable

6.50

0.50 0.60 2.50 3.00

operation (2)

Idle 0.30 0.38 1.50 1.90

Standby 0.20 0.25 1.00 1.25

NOTE 1 Startup values are peak values during response time of Power On to

Power Ready.

NOTE 2 Random operation values are RMS values with a 40 percent random seek,

40 percent write/read (1write in 10 reads) and 20 percent idle mode.

14

200 MB Hard Disk Drive

Figure 3-0
Listing 3-0
Table 3-0

CHAPTER 3

Software Modifications 3

CHAPTER 3

Software Modifications

This chapter describes the modifications made to the control panels to support the
PowerBook Duo 250 computer.

PowerBook Duo 250 Control Panels 3

The functions controlled by the PowerBook Duo control panel have been split between
two panels: PowerBook Duo Setup, and PowerBook. Having two panels makes it easier
to control functions currently available with the PowerBook Duo 250 computer, and
leaves room for growth. Dimming has been moved from the panel PowerBook Display,
and it is now part of PowerBook. Mirror remains in PowerBook Display.

The first panel, PowerBook Setup, controls setup functions for:

■ modem port configuration

■ SCSI disk mode

■ automatic wakeup

The second control panel, PowerBook, is a power management control panel, and it
contains the battery conservation controls, including those items generally available
through the Options button in PowerBook version 7.1: sleep, processor cycling, and
Econo-Mode. It controls backlight dimming, and it can also automatically change the
Power Manager configuration based on the machine’s power source.

PowerBook Setup Panel 3

The PowerBook Duo 250 computer’s PowerBook Setup control panel is a modified
version of the PowerBook Control Panel that shipped with System 7.1. It is essentially the
same control panel, but with all power conservations features removed. It has been
further modified to accommodate different modem configurations. The modem controls
in the PowerBook Setup control panel distinguish between the Express Modem and other
modems. Figure 3-1 shows the modem control panel.

The control panel determines what type of modem is installed and chooses the
appropriate control titles. If an Express Modem is present, the title “Internal Modem” is
changed to “Compatible” and “External Modem” to “Normal.” The functions associated
with the radio buttons have not changed. However, the titles are different to remove the
confusion generated by the incorrect use of internal/external modem when an Express
Modem is installed.

If you have an Express Modem installed, you should typically use the Normal setting. In
this mode, the modem is accessed through the Communications ToolBox (CTB). If you
are using an application that is not CTB-aware, then you should use the Compatible
setting. This will patch the existing serial driver to route serial commands through the
CTB to the Express Modem.

16 PowerBook Duo 250 Control Panels

CHAPTER 3

Software Modifications

Figure 3-1 PowerBook Setup panel

If you have a third-party modem installed, the control titles will be Internal Modem/
External Modem, and they will behave accordingly. They are the same as those used in
PowerBook 7.1.

IMPORTANT

If you select Compatible, port A (Printer/Modem, Modem) is not
available for serial connections. AppleTalk is still available. ▲

PowerBook Control Panel 3

PowerBook control panel is a completely new control panel. It now controls only those
functions associated with battery and power conservation, as described in the two
following sections. The PowerBook control panel is designed for two different groups
of users: those who require the power management procedure to be as simple and
transparent as possible; and power users who wish to have complete control over the
power management functions.

Information about power management is stored in the Preferences file in the System
Folder. When the system is booted, the file is read and the contents stored permanently in
memory.

Custom and Easy Controls for Battery Conservation 3

There are two methods of accessing controls. Initially, if you open the PowerBook control
panel, you will see one simple slider switch (Figure 3-2) that controls a number of
functions. You may adjust this slider, as required, or leave it in the default position.

However, if you click the Custom button in the control panel, you may then select from
additional controls. For example, if you click Custom in the panel that contains the
Battery Conservation slider, you will be able to access three additional sliders that are
subsets of Battery Conservation. They are System Sleeps, HD Spins Down, and Backlight
Dims. If you move any of these sliders, the change will be reflected in the Battery
Conservation slider. Feedback will alert you as to whether the changes improve

PowerBook Duo 250 Control Panels 17

CHAPTER 3

Software Modifications

performance or provide better conservation. The controls revert to the single slider if you
click the Easy control. The PowerBook Control Panel remembers the state in which the
controls were left when last used.

Figure 3-2 PowerBook Control Panel

Power Conservation 3

There are two modes of battery conservation. One is used when the PowerBook Duo 250
computer is plugged into AC main power, and the other is used when the computer is
running on its battery. A TimeMgr task installed by an init in the PowerBook Duo file can
automatically change the power management settings based on the machine
environment.

When the PowerBook Duo 250 computer is shipped, the power conservation settings in
the PowerBook control panel, shown in Figure 3-2, are set with the default settings for
Battery and Power Adapter enabled. If you are using Easy mode, the settings used will be
the default settings, and you will not be able to edit them. If you are in Custom mode,
you can enable or disable automatic conservation, modify both Battery and Power
Adapter, or revert to the default settings. To modify the settings, you may choose the set
of parameters you wish to change (Battery or Power Adapter) through the pop-up menu,
and adjust the sliders. The Power Manager is then reconfigured and the settings stored in
the Preferences file.

At certain times, the PowerBook control panel compares the current Power Manager
settings with both sets of parameters. It does this during open and activate events, when
you switch from Manual to Auto Power Conservation, and when you switch to Custom
view. If a match is found, the name of the matching set is displayed in the pop-up menu,
and both the menu and the default button are active. If no match is found, No Set
Selected is shown in the pop-up menu, and both menu and default button are inactive.
Once a valid set is selected, No Set Selected is removed from the pop-up menu.

18 PowerBook Duo 250 Control Panels

Index

A

active-matrix display 2, 6
APDA addresses ix

B

battery 3
battery conservation 17

custom controls 17

easy controls 17
battery conservation panel 18
block diagram 3
board, inverter/speaker 7
bracket, hard disk drive 10

C

combo chip 3
Communications ToolBox (CTB) 16
control panels 16
conventions used in note vii
custom controls 17
custom mode 18

D

dimensions, hard disk drive 9
display 2
DRAM 2
DRAM connector 2

F, G

fax card 3
features

active-matrix display 6
PowerBook Duo 250 computer 2

H

hard disk drive 2, 7

bracket 10
environmental specifications 8
housing 9
housing requirements 8
interface 11
power requirements 14
SCSI connector 11

terminator 13
hardware modifications 2, 6
housing, hard disk drive 8, 9

I, J

ID encoding, SCSI 13
installation, hard disk drive 8
interface, hard disk drive 11
internal modem 16
inverter/speaker board 3, 7
I/O connector 3

K, L

modifications

hardware 2, 6
software 2, 16

N, O

new features 2
NiCad battery 3

P, Q

PowerBook control panel 16, 17
PowerBook Setup control panel 16
power conservation 18
power management control

panel 16
Power Manager 2
power requirements, hard disk

drive 14
Preferences file 17
processor 2

R

reference material viii
related documentation viii
ROM 2

S

E

easy controls 17
easy mode 18
environmental specifications, hard

disk drive 8

Express Modem 16

keyboard 3

M

microphone 3
modem card 3
modem control panel 16, 17
modems 16
modems, third party 17

SCSI connector

hard disk drive 11

signal assignments 12, 13
SCSI ID encoding 13
Serial Communication Controller

(SCC) 3

signal assignments, SCSI

connector 12, 13

Small Computer System Interface

(SCSI) controller 3

software modifications 2, 16

19

sound 3
speakers 3
system block diagram 3
system controller 2
system control panel 16

modification 16

T, U

terminator, hard disk drive 13
third-party modems 17

V, W, X, Y, Z

video components 2

INDEX

20