[JRios1968]

I never used RPN...I have always swore by Casios like this one:

which is what I used to pass my EIT in 2007 (only 15 years after graduation...very long story.)

I do remember seeing some of my instructors in the General classes use their slide rules even in the mid-to-late 1980s.

[sionnsar]

I think my solar calculator is a Casio, the HPs having become history by one means or another. EIT -- it would be decades for me i I ventured in that direction but I'm now on a different career track that takes me away from day-to-day engineering.

Haven't had an RPN calculator in a long time, but am stuill quite comfortable with them.