USB A connector .
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several USB plugs .
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USB2.0 pinout :

1=+5V (red)
2=-Data (white)
3=+Data (green)
4=Ground (black)

mini or micro:
1=+5V (red)
2=-Data (white)
3=+Data (green)
4= n.c. (gnd in USB-on-the-go type A plug)
5=Ground (black)



USB3, A-plug .
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USB type C .
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USB to PS2 converter .
PS2 pins: 1=data, 2=n.c., 3=gnd, 4=+5V, 5=clock, 6=n.c.
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converters from 2x PS2 (keyboard and mouse) to 1x USB .
In both converters some electronics is built-in to combine the two PS2 ports.
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