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The “Difference Engine” was a proposed mechanical computer to be used to output mathematical tables.
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“Simon” by Edmund Berkeley was the first affordable digital computer that could perform four operations: addition, negation, greater than, and selection.
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AN/FSQ-7 was based on one of the first computers that showed real-time output, Whirlwind
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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.
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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).