HHC2021 Bob's Calculator Challenge

[J-F Garnier]

I watched the video with Bob's concocted challenge. I loved it and have to admit that my score was rather low ...

I even failed to find the answer to the question #5 " For the HP-41, which commands are HP-IL specific, yet are NOT in the HP-IL module?".
Too bad for a so-called HP-IL expert :-(

A few comments:

Question #12: "Which Pioneer machines were only sold in a single model configuration?"
One of Bob's answers was the HP-22S, but it's wrong it existed as the 32S (see question 8) with
original flat LCD + small LCD digits + boxed alpha letters and
improved recessed LCD + larger digits + unboxed-lowered letters. See here.

Question #13: "Which HP calculator returns -0.00 for certain operations?"
The HP-71B came to my mind immediately since it handles signed zero, but I guess it is out of scope according to the way the question is set (-0.00)
My answer would be the HP-45 (maybe others too): try 1000 CHS 1/x and you get -0.00. Doesn't it fit the question? :-)

Thanks again Bob for the fun !

J-F