Keyboard/Mouse Connector
Each ThinkPad computer has a keyboard/mouse connector where
the IBM mouse, keyboard, or numeric keypad is connected.
Signals
The keyboard and mouse signals are driven by open-collector drivers
pulled to 5 V dc through a pull-up resistor. Figure 2-1 lists the
signals.
Figure
2-1. Keyboard and Mouse Signals
Sink current
20 mA
Maximum
High-level output voltage
5.0 V dc minus pullup
Minimum
Low-level output voltage
0.5 V dc
Maximum
High-level input voltage
2.0 V dc
Minimum
Low-level input voltage
0.8 V dc
Maximum
Connector
The keyboard/mouse connector uses a 6-pin, miniature DIN
connector.
1
2
3
4
5
6
Figure
2-2. Keyboard/Mouse Connector Pin Assignments
Pin
I/O
Signal Name
1
I/O
Mouse Data
2
I/O
Keyboard Data
3
–
Ground
4
–
+5 V dc
5
I/O
Mouse Clock
6
I/O
Keyboard Clock
Note: The maximum current for +5 V dc (pin 4) is 0.5 A for both the
mouse and the numeric keypad.
2-4
ThinkPad 560Z System Board
Содержание ThinkPad 560Z
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