The computer mouse was a pointing device invented in the 1960s by Douglas Engelbart as a means of avoiding the use of the finger to smear dirt and oil on glass particularly at ATMs and PoS stations.
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The photo reminds me that the PCjr used an optical mouse with a metal mouse pad.
I still remember that small amount of time that I used a mouse with a metal mousepad (on a Macintosh). It seemed like those style of optical mice only lasted for a very brief amount of time and was a tad finicky. Still, I wonder how many folks never knew that mice using metal mousepads even existed.
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