Apple Power Macintosh 7200/75 Technical Information

ð Developer Press  Apple Computer, Inc. 1995 ð Developer Note Power Macintosh 7200 Computer

x PREFACE Supplemental Reference Documents 0 The following documents provide information that complements or extends the information in this develop

xi PREFACE Other Publications 0 For information about programming the PowerPC  601 microprocessor, developers should have copies of Motorola’s Po

xii PREFACE Note A note like this contains information that is interesting but not essential for an understanding of the text. ◆IMPORTANT A note like

xiii PREFACE CD-ROM compact-disc read-only memoryCISC complex instruction set computingCPU central processing unitDAC digital-to-analog converterDBD

xiv PREFACE RAM random-access memoryRAMDAC random-access memory, digital-to-analog converterRAS row address strobeRGB red-green-blue, a video signal

CHAPTER 1 Introduction 1Figure 1-0Listing 1-0Table 1-0

CHAPTER 1 Introduction 2 Appearance and Features The Power Macintosh 7200 computer is the lowest-cost multislot model in the new Power Macintosh comp

CHAPTER 1 IntroductionAppearance and Features 3 Figure 1-2 Back view of the Power Macintosh 7200 computer The Power Macintosh 7200 computer has a hin

CHAPTER 1 Introduction 4 Appearance and Features Figure 1-4 Unlocking the top chassis Figure 1-5 shows the top chassis in the open position. Figure

CHAPTER 1 IntroductionComparison With Other Power Macintosh Computers 5 The following list is a summary of the hardware features of the Power Macinto

ð Apple Computer, Inc.  1995 Apple Computer, Inc.All rights reserved. No part of this publication may be reproduced, stored in a retrieval system,

CHAPTER 1 Introduction 6 Comparison With Other Power Macintosh Computers Table 1-1 compares the main features of the Power Macintosh 7200 computer wi

CHAPTER 1 IntroductionConfigurations and Options 7 Configurations and Options 1 Table 1-2 shows the standard configurations for the Power Macintosh 7200

CHAPTER 1 Introduction 8 Compatibility Compatibility 1 The Power Macintosh 7200 computer is a new entry-level model in the desktop Power Macintosh co

CHAPTER 1 IntroductionCompatibility 9 Power Supply 1 The power supply in the Power Macintosh 7200 computer is not self configuring for different input

CHAPTER 2 Architecture 2Figure 2-0Listing 2-0Table 2-0

CHAPTER 2 Architecture 12 Main ICs and Subsystems This chapter describes the architecture of the Power Macintosh 7200 computer. It describes the majo

CHAPTER 2 ArchitectureMain ICs and Subsystems 13 Figure 2-1 Block diagram Random-Access Memory 2 All RAM in the Power Macintosh 7200 computer is prov

CHAPTER 2 Architecture 14 Main ICs and Subsystems Second-Level Cache 2 The Power Macintosh 7200 computer has a slot for installing optional second-l

CHAPTER 2 ArchitectureMain ICs and Subsystems 15 Bandit Bus Bridge IC 2 The Bandit custom IC provides the interface between the processor and the PC

iiiContents Figures and Tables vii Preface About This Developer Note ixContents of This Note ixSupplemental Reference Documents xApple Publications x

CHAPTER 2 Architecture 16 Main ICs and Subsystems The Grand Central IC provides bus interfaces for the following I/O devices: Cuda microcontroller

CHAPTER 2 ArchitectureMain ICs and Subsystems 17 VRAM and VRAM Expansion 2 The Power Macintosh 7200 computer has 1 MB of VRAM soldered to the main l

CHAPTER 3 I/O Features 3Figure 3-0Listing 3-0Table 3-0

CHAPTER 3 I/O Features 20 I/O Ports This chapter describes the I/O features of the Power Macintosh 7200 computer—both the built-in I/O devices and th

CHAPTER 3 I/O FeaturesI/O Ports 21 Table 3-1 gives the pin assignments for both serial port connectors. Pin 9 on each serial connector provides +5 V

CHAPTER 3 I/O Features 22 I/O Ports The ADB is a single-master, multiple-slave serial communication bus that uses an asynchronous protocol. The custo

CHAPTER 3 I/O FeaturesI/O Ports 23 The 10baseT connector pin assignments are shown in Table 3-4. SCSI Port 3 The Power Macintosh 7200 computer uses

CHAPTER 3 I/O Features 24 I/O Ports The external SCSI port has automatic termination like that on the Power Macintosh 6100, 7100, and 8100 computers.

CHAPTER 3 I/O FeaturesI/O Ports 25 Sound Input Jack 3 The Power Macintosh 7200 computer has a stereo sound input jack for connecting an external micr

iv Grand Central I/O System IC 15Curio I/O Controller IC 16Cuda Microcontroller IC 16AWACS Sound IC 16VRAM and VRAM Expansion 17 Chapter 3 I/O Featur

CHAPTER 3 I/O Features 26 I/O Ports Video Monitor Connector 3 The Power Macintosh 7200 computer requires an external video monitor for the graphics d

CHAPTER 3 I/O FeaturesI/O Ports 27 The video circuitry uses the sense lines to determine the type of monitor that is connected. Table 3-7 shows the s

CHAPTER 3 I/O Features 28 Disk Drives Disk Drives 3 The Power Macintosh 7200 computer has one internal floppy disk drive and one internal hard disk dr

CHAPTER 3 I/O FeaturesDisk Drives 29 Internal Hard Disk Drive 3 The Power Macintosh 7200 computer has one internal hard disk drive. The drive capacit

CHAPTER 4 Expansion Features 4Figure 4-0Listing 4-0Table 4-0

CHAPTER 4 Expansion Features 32 RAM DIMMs This chapter describes the expansion features of the Power Macintosh 7200 computer: the RAM expansion DIMMs

CHAPTER 4 Expansion FeaturesRAM DIMMs 33 RAM DIMM Connectors 4 Table 4-2 gives the pin assignments for the RAM DIMM connectors. Table 4-2 Pin assign

CHAPTER 4 Expansion Features 34 RAM DIMMs 55 DQ(18) 86 DQ(32)56 DQ(19) 87 DQ(33)57 DQ(20) 88 DQ(34)58 DQ(21) 89 DQ(35)59 VCC 90 VCC60 DQ(22) 91 DQ(36

CHAPTER 4 Expansion FeaturesRAM DIMMs 35 117 A(1) 143 VCC118 A(3) 144 DQ(54)119 A(5) 145 Reserved120 A(7) 146 Reserved121 A(9) 147 Reserved122 A(11)

v Open Transport 48New Features of Open Transport 49Compatibility 49Open Firmware Startup 50Enhanced Power Management Software 51Features of the New

CHAPTER 4 Expansion Features 36 RAM DIMMs Table 4-3 describes the signals on the RAM DIMM connector. RAM Address Multiplexing 4 Depending on their i

CHAPTER 4 Expansion FeaturesRAM DIMMs 37 Table 4-4 Address multiplexing modes for various DRAM devices Device size Device typeSize of rowaddressSiz

CHAPTER 4 Expansion Features 38 RAM DIMMs Table 4-5 shows how the address signals to the RAM devices are multiplexed during the row and column addres

CHAPTER 4 Expansion FeaturesRAM DIMMs 39IMPORTANT The JEDEC MO-161 specification shows three possible heights for the 8-byte DIMM. The Power Macintosh

CHAPTER 4 Expansion Features 40 Second-Level Cache SIMM Second-Level Cache SIMM 4 The Power Macintosh 7200 computer has a slot for a second-level (L2

CHAPTER 4 Expansion FeaturesSecond-Level Cache SIMM 41 69 GND 92 GND 115 T15 138 D3570 D48 93 +3.3 V 116 GND 139 D3571 D50 94 GND 117 +3.3 V 140 D377

CHAPTER 4 Expansion Features 42 PCI Expansion Slots Table 4-7 defines the signals on the L2 cache SIMM connector. PCI Expansion Slots 4 The Power Ma

CHAPTER 4 Expansion FeaturesPCI Expansion Slots 43 The Power Macintosh 7200 computer accepts standard PCI cards as defined by the PCI Local Bus Speci

CHAPTER 5 Software Features 5Figure 5-0Listing 5-0Table 5-0

CHAPTER 5 Software Features 46 New Features The system software for the Power Macintosh 7200 computer is based on System 7.5 and is augmented by seve

CHAPTER 5 Software FeaturesNew Features 47 System-Level Software 5 Several system components have been modified to use the 64-bit APIs to correctly ca

CHAPTER 5 Software Features 48 New Features Limitations 5 The software modifications that support large partition sizes do not solve all the problems

CHAPTER 5 Software FeaturesNew Features 49 Open Transport does not use the conventional .ENET-style drivers; instead it uses Streams-based DLPI drive

CHAPTER 5 Software Features 50 New Features Open Transport provides compatibility with Power Macintosh computers by means of the following features:

CHAPTER 5 Software FeaturesNew Features 51 Device drivers required during system startup (called boot drivers ) are also stored in the expansion R

CHAPTER 5 Software Features 52 New Features Figure 5-1 Energy Saver application dialog box Features of the New Energy Saver Software 5 The Energy Sav

CHAPTER 5Software FeaturesPerformance Enhancements 53that is as consistent as possible across desktop Macintosh computers and portable Macintosh compu

CHAPTER 5Software Features54 Performance EnhancementsMath Library 5The new math library (MathLib) is an enhanced version of the floating-point library

CHAPTER 5Software FeaturesHardware Support Features 55Table 5-1 summarizes the BlockMove routines according to two criteria: whether it is OK to use f

vii Figures and Tables Chapter 1 Introduction 1 Figure 1-1 Front view of the Power Macintosh 7200 computer 2 Figure 1-2 Back view of the Power Macint

CHAPTER 5Software Features56 Hardware Support FeaturesPCI Bus Support 5The Power Macintosh 7200 computer does not use NuBus slots for hardware expans

CHAPTER 5Software FeaturesHardware Support Features 57The QuickDraw acceleration API is the current accelerator interface for the Power PC version of

CHAPTER 6 Large Volume Support 6Figure 6-0Listing 6-0Table 6-0

CHAPTER 6 Large Volume Support 60 Overview of the Large Volume File System This chapter describes the large volume file system for the Power Macintosh

CHAPTER 6 Large Volume SupportThe API Modifications 61 that disk will occupy at least 32 KB of disk space. This inefficient use of disk space is not ad

CHAPTER 6 Large Volume Support 62 The API Modifications addition, several of the fields that were previously signed are now unsigned (parameter names

CHAPTER 6 Large Volume SupportThe API Modifications 63 ioVNmFls The number of files in the root directory. ioVBitMap The first block of the volume bitma

CHAPTER 6Large Volume Support64 The API ModificationsThe only change in the parameter block is the parameter ioWPosOffset, which is of type int64. stru

CHAPTER 6Large Volume SupportThe API Modifications 65ioPosMode The positioning mode for setting the mark. Bits 0 and 1 of this field indicate how to pos

viii Table 4-6 Pin assignments for L2 cache SIMM connector 40 Table 4-7 Signal descriptions for L2 cache SIMM connector 42 Table 4-8 PCI signals 43 C

CHAPTER 6Large Volume Support66 The API ModificationsAn arrow preceding a parameter indicates whether the parameter is an input parameter, an output pa

CHAPTER 6Large Volume SupportThe API Modifications 67DESCRIPTIONThe PBXGetVolInfo function returns information about the specified volume. It is similar

69680x0 code Instructions that can run on a PowerPC processor only by means of an emulator. Compare native code. ADB See Apple Desktop Bus.APDA A

GLOSSARY 70Curio A custom IC that provides I/O interfaces for Ethernet, SCSI, SCC, and LocalTalk. DAC See digital-to-analog converter.data burst Mul

GLOSSARY 71little-endian Data formatting where fields are addressed by pointers to their least significant bytes or bits. See also big-endian.LocalTal

GLOSSARY 72video RAM (VRAM) Random-access memory used to store both static graphics and video frames. VRAM See video RAM.Y/C Same as S-video.YUV A

73 Index A abbreviations xiiADB 21–22ADB connector 21–22address multiplexing, RAM 36–38APDA information xappearance 2Apple AUI connector 22Apple Desk

INDEX 74 H hard disk drive 29hexadecimal numbers xiHFS volume format 60 I, J, K interpretive emulator 53I/O parameter block, extended 63–65I/O ports

INDEX 75 startup firmware. See Open Firmware startup processStreams network protocol 49SWIM III floppy disk controller 15System 7.5 46 T, U 10baseT c

ix PREFACE About This Developer Note This developer note describes the Power Macintosh 7200 computer and compares it with the earlier Power Macintos

THE APPLE PUBLISHING SYSTEM This Apple manual was written, edited, and composed on a desktop publishing system using Apple Macintosh computers and Fr