FireWire Connector
The FireWire connector has six contacts, as shown in Figure 3-2. The connector pin assignments are shown in Table 3-2. Table 3-2 Pin assignments on the FireWire connector Table 3-2 Pin assignments on the FireWire connector Unregulated DC 12.0-16.8 V no load when operating with battery or power adapter Ground return for power and inner cable shield Twisted-pair B, differential signals Twisted-pair B, differential signals Pin assignments on the FireWire connector continued Twisted-pair A,...
Devices and Ports Eze
Composite video and S-video signals can be displayed on either an NTSC display or a PAL display. When a display is connected by way of the video adapter, the computer detects the type of adapter and enables the composite and S-video outputs. The settings for the resolutions and standards NTSC or PAL are then selectable in the Monitor control panel or control strip. The video output mirrors the flat panel display internal and external video share the same buffer, and the hardware sends the image...
Mechanical Design of the RAM SODIMM
The mechanical characteristics of the RAM expansion module are given in the JEDEC specification for the 144-pin 8-byte DRAM SO-DIMM. The specification number is JEDEC MO-190-C. To find out how to obtain the specification, see RAM Expansion Modules page 70 . The specification defines SO-DIMMs with nominal heights of 1.0, 1.25, 1.5, or 2.0 inches. The iBook can accommodate standard SO-DIMMs with a height of 1.0 or 1.25 inches. The JEDEC specification defines the maximum depth or thickness of an...
Power Stepping
To conserve power when operating on battery power, the iBook computer supports two methods of power stepping to slow down the processor clock. One method is an inherent feature of the PowerPC G3 chip, called Dynamic Power Stepping DPS and cannot be adjusted by the user. DPS is controlled automatically by the system, stepping up the processor speed for performance-intensive applications and stepping down the processor speed for energy-efficient applications. Under Mac OS X, users can manually...
External Display Port
The iBook computer has a video output port for connecting an external video monitor or projector. The port supports both VGA and TV signals by means of adapters. The port detects the type of adapter connected to it and programs the graphics IC to provide the appropriate type of video signals, as shown in the table below. Adapter type Video signals Connector type s VGA RGB VGA 15-pin miniature D-type Video Composite and S-video RCA and S-video Resolutions supported are 640 by 480, 800 by 600,...
Hard Disk Connector
The internal hard disk has a 48-pin connector that carries both the ATA signals and the power for the drive. The connector has the dimensions of a 50-pin connector, but with one row of pins removed, as shown in Figure 3-4. The remaining pins are in two groups pins 1-44, which carry the signals and power, and pins 45-48, which are reserved. Pin 20 has been removed, and pin 1 is located nearest the gap, rather than at the end of the connector. Figure 3-4 Hard disk connector and location Figure...
Mac OS X
Mac OS X version 10.2 is installed by default on the iBook computer. For access to Apple's developer documentation for Mac OS X, see the Apple Developer Connection ADC website at O'Reilly amp Associates publishes a series of books about Mac OS X development. The books in this series have been technically reviewed by Apple engineers and are recommended by the Apple Developer Connection.
Other Control Keys
The cursor control keys can also be used as page control keys. Other control keys can take on the functions of certain keys on a PC keyboard, for use with PC emulation software. The Fn key controls the modes of operation of this group of keys. Table 3-10 is a list of these keys and their alternate functions. These control keys are also show in Figure 3-9.
Ethernet Controller
The Pangea IC includes an Ethernet media access controller MAC that implements the link layer. As a separate channel connected directly to the Pangea logic, it can operate at its full capacity without degrading the performance of other peripheral devices. The Pangea IC provides DB-DMA support for the Ethernet interface. The controller is connected to a PHY interface IC that is capable of operating in either 10-BaseT or 100-BaseT mode. The actual speed of the link is automatically negotiated by...
Power PC G Microprocessor
The microprocessor used in the iBook computer is a PowerPC G3. It has several features that contribute to superior performance, including on-chip level 1 L1 caches, 32 KB each for instruction cache and data cache an on-chip second level L2 cache consisting of 512 KB with a clock speed ratio of 1 1 a microprocessor core optimized for Mac OS applications The G3 microprocessor in the iBook computer normally runs at a clock speed of 700 or 800 MHz. The Power Stepping feature slows the clock speed...
The Embedded Keypad
A certain group of alphanumeric keys can also function as an embedded keypad. The user selects this mode by using the Fn key or the Num Lock key. Figure 3-9 shows the keys making up the embedded keypad and Table 3-9 lists them. Table 3-9 Embedded keypad keys continued When the embedded keypad is made active by the Num Lock key, the other alphanumeric keys have no operation NOP , as shown in Figure 3-9. The affected keys include certain special character keys plus and equal sign, right and left...
Memory and IO Device Controller
The Pangea memory controller and I O device controller IC provides cost and performance benefits by combining many functions into a single IC. It contains the memory controller, the PCI bus bridge, the Ethernet and FireWire interfaces, and the AGP port. In addition to the buses listed in Table 2-1, the Pangea IC also has separate interfaces to the physical layer PHY ICs for Ethernet and FireWire and an I2C interface that is used for configuring the memory subsystem. Table 2-1 Buses supported by...
USB Connector
The USB port uses a USB Type A connector, which has four pins. Two of the pins are used for power and two for data. Figure 3-1 is an illustration of a Type A USB port. Table 3-1 shows the pin assignments. Table 3-1 Pin assignments on the USB port Table 3-1 Pin assignments on the USB port The iBook computer provides power for the USB ports at 5 V and up to 500 mA each. Each USB port supports both low-speed and high-speed data transfers, at up to 1.5 Mbps and 12 Mbps, respectively. High-speed...
Open Firmware
Three technical notes provide an introduction to Open Firmware on the Macintosh platform. They are TN1061 Open Firmware, Part I, available on the technical note web site at TN1062 Open Firmware, Part II, available on the technical note web site at TN1044 Open Firmware, Part III, available on the technical note web site at TN2001 Running Files from a Hard Drive in Open Firmware, at