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CHAPTER 1
Introduction to the PowerBook Duo 250 Computer
PowerBook Duo 250 Computer Features
3
■
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
Simplified block diagram of the PowerBook Duo 250 computer system
Main expansion connector
Provides access to:
Duo Floppy Adapter
Duo MiniDock
Duo Dock
68030 33 MHz microprocessor
Main system controller (MSC)
Power Manager
Video control
Sound control
System ROM
Integrated FPU
Communication
Fax/modem
SCC interface
SCSI capability
Processing
and control
Memory and storage
4MB DRAM
Up to 32 MB DRAM expansion
160 MB or 240 MB hard disk
Active-matrix 8-bit or 16-bit
color display
Keyboard
Trackball
Microphone and speaker
Human
interface