If I remember correctly I've discovered RPN via an HP 49g+ and was very enlightened for it's quickness, not counting the "natural" equation editor, natural mean

If I remember correctly I've discovered RPN via an HP 49g+ and was very enlightened for it's quickness, not counting the "natural" equation editor, natural meaning that selections works like RPN stack. I do honestly not remember if I ever encounterd dc (while I've used bc, very casually mostly for computing partition boundaries and alike) but I still use M-x calc, which is actually RPN as well. After this post I've looked a man and well, it's a bit limited, googled a bit I've seen it's powerful, with macros, registers, usable for interactive scripts etc, I think it's a remarkable piece of software from another era, not because of RPN witch is very valid today, but because it was designed to run on limited resources to a point of being long to learn, a thing that might be useful today for quickness, but I fail to se a case for dc, and in general is not needed. A good example of old glories, nice for inspiring some modern design which tend to be crapplily complex on average... We can do much with very little, if we find clever ways to do so.