Apple Desktop Computer manual Architecture

C H A P T E R 2

Architecture

The components at the heart of the iMac computer reside on two printed-circuit boards: the main logic board and the processor module. The Figure 2-1 is a block diagram showing the major components on those boards. The components shown are described in the sections that follow.

Figure 2-1 Block diagram

Processor module

RAM

SO-DIMM

RAM

SO-DIMM

Modem module

Modem Datapump DAA controller

Telephone connector

512 KB
Backside			RAM
L2 cache
			ROM
PowerPC		Data			Grackle
					memory
	G3
		Address		controller
micro-
					and PCI
processor
				bus bridge

Internal	Rage IIc
video
	video
monitor
	DAC

SGRAM

Main logic board

PCI bus	Paddington
	I/O and
		disk
	controller

Burgundy sound I/O

Cuda

power

manager

IC

ST10040

Ethernet IC

Internal microphone

Sound in

Sound out

Speakers

Headphone jack board

Internal CD-ROM drive

Internal IDE disk drive

IrDA board

Power switch and LED

Ethernet connector

SGRAM SO-DIMM

USB IC

USB port 1

USB port 2

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