A simple RPL program (feat. HP 28S)

RPL is/was so elegant. I have watched videos on programming the HP 42S and thought the HP28/48 (RPL calculators) deserved some attention given its ease of use.
Two approaches are shown. A "macro" approach and a "function" approach -- both work well for simple programs. RPL is also capable of much more serious programming, but I think most of us just want to do simple things.
Music was composed by Jake Miller. Thank you, Jake, for letting me use it!

[@cret859]

The really "TOO COOL" stuff with HP28S (and other RPL calculators) is that the programs you just have type-in can be use for numerical entries (like you show it in your video), but also for symbolic or literal entries as well: [ A ][SPACE][ B ] (PYTH) immediately show ' √(SQ(B)+SQ(A))' without any further modification !

[@scottcollins7513]

Very cool.

[@thanh-dungnguyen8078]

Thank you for all the videos 👍

[@mauriciolacruz]

Does this 28S have the same solid "click" feel on the keyboard like all other vintage HP calculators?

[@scottcollins7513]

I don’t have experience with any other hp calculators besides the hp 28S, 48GX, and the Prime. All of them have great keyboards and all of them feel different. I did/do love the feel of the 28S - pretty sure my favorite feel of the three. But, I don’t know how it compares with something like a 15C.

[@mauriciolacruz]

@@scottcollins7513 I do have: - Several 48G series (great keyboard, the best of all my HPs.) - Several old 12C (great keyboard too, although not as consistent between units as on the 48G series.) - Some new 12C (far inferior keyboard feel [less solid/clicky and lighter keys] than the old 12C and 48G series.) - Couple 35S (as with the 12C, far inferior keyboard feel [less solid/clicky and lighter keys] than the old 12C and 48G series.) I just wonder how the 28S keyboard feels in comparison to the models described above (i.e. if as solid as on the 48G series or lighter/weaker like on the 35S?)

[@scottcollins7513]

@@mauriciolacruz I think the 28S has the same general solidness as the 48GX. I have them both side by side and would characterize the 48GX as having a more pronounced detent upon pushing. Both feel high quality. I'd give the edge to the 48GX in feel. I will say, though, that with the 28S I never missed a key stroke b/c all the inputs were buffered whereas w/ the 48GX every once in a while a digit would not register (like if entering 777 quickly). Also, I think my original 28S had a better keyboard feel then my current one -- but that could just be due to age of the device. I have a DM42 too (w/ the better, revised keyboard design) -- it feels well-made, but not to the same level as the 48GX or the 28S. More like the hp Prime, but w/ a more pronounced click and more key travel. DM42 with the 48GX or 28S keyboard would be even better. DM42 screen blows away the 48GX and 28S (28S is better than 48GX).

[@cret859]

Yes, I have on my desk HP28S, HP41C, HP15C and HP71B; they all have the HP's trapezoid-shaped keys and the same "click" feel at keypress. Perhaps is the HP-41C more noisy, but the feelings when pressing are really close and you can always feel the "click" indicating that a good key press has occur. Very important for speed typing without even looking at your finger or calculator screen during entry ! Keep you concentrate on reading data for paper or any source.

[@GeoCalifornian]

Scotty, you are the Man... how much did you pay for your HP.?

[@scottcollins7513]

I never saw your comment til now (yikes). I bought one new in college, but ended up giving that one to a friend who’s hp 28S had worn out from use. I eventually missed it and possibly over-paid when I bought one with box and manuals for around $150 used.