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Chapter 9—Keyboards, Mice, and Input Devices
standard to a connector using the other standard. The keyboard
connector standards are as follows:
• 5-pin DIN connector—Used on most PC systems with
Baby-AT form factor motherboards.
• 6-pin mini-DIN connector—Used on PS/2 systems and
most PCs with LPX, ATX, and NLX motherboards.
• USB connector—Used on “legacy-free” systems that lack
PS/2, serial, or parallel ports.
Figure 9.4 and Table 9.8 show the physical layout and pinouts of
the respective keyboard connector plugs and sockets for the DIN
and mini-DIN connector. Refer to Chapter 8, “USB and IEEE-1394
Ports and Devices,” for USB connectors.
5-pin DIN
6-pin mini-DIN
6-pin SDL
4
1
Plug
2
3
Plug
5 6
3
4
1 2
Plug
5
Socket
3 1
5
4
2
Socket
6 5
4
3
2 1
Socket
A B C D E F F E D C B A
Figure 9.4 Keyboard and mouse connectors.
Keyboard Connector Signals
Table 9.8 lists the keyboard connector signals for three common
keyboard connectors.
Table 9.8 Keyboard Connector Signals
Signal Name 5-Pin DIN1 6-Pin Mini-DIN 6-Pin SDL2 Keyboard Data 2 1 B
Ground 4 3 C
+5v 5 4 E
Keyboard Clock 1 5 D
Not Connected — 2 A