I would like to ask the HP experts about two things, related to the HP19bII
First, who on hell designed the HP28-HP19b-HP19bII side door? I have seen many units and all, and I mean all, have cracks in the doors, if not completely broken doors. This is not like HP. HP took pride in designing quality goods, and they succeeded big time with the HP35, HP65, HP67, HP41, HP12c, HP15c.
So, how come that a calculator with such fantastic firmware (both the scientific side and the financial side), could have such a poor solution?
I think that this was one of the main reasons for taking this otherwise fantastic calculator out of the market.
However, the solution was in front of them. So in front of them that they found it! Enter the back door HP19bII. Looking alike the other models, (perhaps a little darker black in the body, compared to the brownish color of the normal ones), it is safe to use without fear. It uses 3 N-type batteries, just like the other (and the 41c, by the way).
I really think that there has been no better financial calculator. I would be tempted to say that is one of the best calculators - period. (I know that most calculator specialists woill disagree, but that's because they are bent to scientific calculators). Its current sibling, the HP17bII, lacks a full keyboard to enter complex solver functions. You can see three full lines, nearly the full stack, and also has some more mathematical functions than the 17bII. It is the ideal calculator for an engineer doing management - it will cover all of his requirements. Keyboard is excellent. Screen contrast is poor - as it was with any dot-matrix calculator of that time; but then you had three lines that allowed you to nearly see your full stack