Which calculators had no known bugs?

[rprosperi]

(08-05-2017 02:11 AM)PANAMATIK Wrote:  The sequence I found is the following:

Switch On the calculator in RUN mode.
Press 1 and hold down the key.
Switch to PRGM mode and release the key.
Press 1 again and hold down.
Switch back to RUN mode and release the key.
Then press 1 repeatedly and you will see the bug.

Confirmed on HP-25 (not 25C) s/n 1605A03202

Interesting find Bernhard.

And it makes me wonder how long you searched before coming up with that reproducible sequence.