Which calculators had no known bugs?

[PANAMATIK]

(08-05-2017 04:54 AM)Joe Horn Wrote:  At HHC 2010 (aka HHC MMX) I gave a brief talk about bug hunting and presented a short list of "My Favorite Bugs" in HP calculators. Please note that the list is by no means complete; it's just my favorites. Some are not really bugs, but hidden features or anomalies or simply unexpected weirdness.

I found both my HP-25 bugs in your list. Thus I'm not a discoverer

Thanks Bernhard