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The optical mice were available way back in the mid '80s. Expensive, not very sensitive, and required a lined or patternized surface. Only draftsmen used them, lotus users got by handsomely with the keypad. They ended up being serial because the parallel ports were 32 pin bi directional and huge. You typically had only one, just for the printer or scanner. My state of the then art XP machine had 10 serial 1parallel.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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