15C functions that can be cancelled with 'null' (quiz)

[rprosperi]

(10-15-2024 07:51 AM)J-F Garnier Wrote:  One little hint for the remaining 6 operations/8 key sequences, taken from the Owner's Manual, p.149:

Quote:While the key used for any matrix operation that stores a result in the
result matrix is held down, the descriptor of the result matrix is displayed.
If the key is released within about 3 seconds, the operation is performed,
and the descriptor of the result matrix is placed in the X-register.
If the key is held down longer, the operation is not performed and the
calculator displays null.

J-F

Yes, this one was hardest to find! And if I ever knew this at all (back in the day) then I'd completely forgotten it! It's both frustrating to realize there are things about such a well-known product that have been forgotten, but also satisfying to find "new" features decades into use.

It's a bit like dimensia, when you get to experience the joy of discovering new things each day, including some that were discovered the day before!