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                                                                                                              Theory of Operation

 

This section contains a general block diagram theory of operation description of the 
Extensa 900 Series Notebook Computers.

Note: Various internal components may change on future models and 
busses/bus speeds are subject to change.

The Extensa 900 Series Notebooks consist of eight major functions or sections 
including:

♦

System Processor — implemented on the Main Board Assembly

♦

Memory Subsystem — implemented on the Main Board Assembly

♦

I/O Subsystem — implemented on the Main Board Board

♦

Keyboard Subsystem — implemented on the Main Board Assembly and the 
Keyboard Assembly

♦

Video Subsystem — implemented on the Main Board and LCD Display Panel 
assemblies

♦

Sound Subsystem — implemented on the Main Board Assembly

♦

Touchpad Mouse Subsystem — implemented on the Touchpad assembly and 
on the Main Board Assembly

♦

Hard Disk Drive Subsystem — implemented on the Main  Board Assembly and 
the Hard Disk Drive Assembly

♦

Floppy Disk Drive Subsystem — implemented on the Main Board Board and 
Floppy Disk Drive Assembly

♦

PCMCIA Controller and Sockets — implemented on the PCMCIA Module and 
on the Main Board

♦

Power Subsystem — implemented on the Main Board, the battery pack, and 
the AC adapter