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USB/PS2 Trackball Help - Sad I know

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topdawgg:
Bump.

pmc:

--- Quote from: rdagger on September 23, 2005, 05:50:57 pm ---It's good for safety and to protect your electronic equipment from static electricity damage.  It needs to be connected to something that connects to an earth ground such as your computer chassis or the 3rd hole on an electrical outlet.  I have a metal surge
--- End quote ---

Why is this necessary for a USB or PS/2 trackball? They both ground to the PC's ground anyway (USB on pin 4 and PS/2 on pin3).

-pmc

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