Apple 250 manual Main expansion connector

C H A P T E R 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 1-1Simplified block diagram of the PowerBook Duo 250 computer system

Main expansion connector

Provides access to:

Duo Floppy Adapter

Duo MiniDock

Duo Dock

Communication Memory and storage

Fax/modem SCC interface SCSI capability

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