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First Computer: “Difference engine”
The “Difference Engine” was a proposed mechanical computer to be used to output mathematical tables. -
First Personal Computer: “Simon”
“Simon” by Edmund Berkeley was the first affordable digital computer that could perform four operations: addition, negation, greater than, and selection. -
First Real-Time Graphics Display Computer: AN/FSQ-7 by IBM
AN/FSQ-7 was based on one of the first computers that showed real-time output, Whirlwind -
First Mouse
He thought up a device with a pair of small wheels (one turns horizontally the other vertically) which can be used to move a cursor on a screen. -
First Touchscreen
It’s a capacitative touchscreen panel, with no pressure sensitivity (there’s either contact, or no contact) and it only registers a single point of contact (as opposed to multitouch).