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Trackballs? No we don’t have it.
We are going around in circles so this is my last word about this subject.
I mentioned a “precision finger pointing device”; In other words, a trackpad which already exists on every laptop and/or notepad/book.
 
I often ponder what the informal/lunch-time/backroom discussions are like in the U.S. Patent Office when stuff like this are filed.
 
RPN calculator
I Googled this only to realize it’s just a calculator. This is the type my father used when I was growing up, and I don’t recall finding it difficult to use. Maybe it’s because it wasn’t a high pressure situation. Do people find these difficult?
 
I Googled this only to realize it’s just a calculator. This is the type my father used when I was growing up, and I don’t recall finding it difficult to use. Maybe it’s because it wasn’t a high pressure situation. Do people find these difficult?

Most people in my class at the time found them very difficult to use. I liked them. Things were entered in a logical order. I should have said that I used a more capable RPN model, and carried the other for a spare, and to loan out to people that mooched. One guy LOVED it. Wanted to buy it even.
 
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