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1.8.8 Pointing Device Subsystem
The pointing device subsystem (Figure 1-17) consists of the built-in "Point"
device on the keyboard and a pre-programmed 82c752 micro-controller that
interfaces the mouse device to the main board. An external PS/2 port also
supports the use of an external PS/2 compatible mouse.
1.8.9 Keyboard Subsystem
The keyboard subsystem is implemented on the keyboard assembly,
Keyscan Board, and part of the System Board.
The TravelMate 5000 Series Keyboard, shown in Figure 1-18, is an
83/84-key, IBM enhanced-type keyboard with the standard character and
function keys plus 12 programmable function keys (F1 through F12).
Using the Special Function (Fn) key which assigns multiple functions to
keys, the keyboard can emulate the IBM 101/102 keyboards using 83 keys
(84 on international models).
The keyboard has a 4mm stroke and features a special keyboard interface
chip that can detect multiple levels of key input (good simulation of N-key
rollover for up to 10 keys).
Some of the major features of the keyboard include:
• 4-mm Key movement
Embedded Point Device
Select Switches
83/84 Key , 4mm Keyboard
Figure 1-17 Notebook Pointing Device
1-34 General Description