Very nice! Was this a rebranding of another make or made by radioshack themselves?
dm319
joined 3 months ago
Ah yes that's a pretty nice graphing calculator, also looks pretty good in pink!
The HP-65 was not only HP's first programmable scientific, but it could also read and write magnetic cards. There were several 'pac's of cards allowing it to tackle financial, astronomical, aviation, electrical and other speciality field calculations. The buttons were double shot and have a lovely tactile click. The red LED screen is remarkably crisp and easy to read.
I think I like the buttons and the highly-specialised functionality. At least that's what I think when people say 'what's the point, you have a far more powerful calculator in your pocket already'. Yes, one without buttons.
It is! Not mine sadly, but amazing to see such a thing. I didn't have much time so apologies for not stopping down enough - I didn't realise at the time!
These are the tests which can give you quite a good profile and accuracy rating for your financial calculator. Any more contributions and confirmation are very much appreciated and I will update the swissmicros page (though I may need to move it off there at some point).
| # | Ref | N | I%YR | PV | PMT | FV | P/YR | Mode |
|----|------------|--------------|-----------|----------|--------------|-----------|------|-------|
| 1 | DM | 38 x 12 | 5.25% | 270'000 | ? | 0 | 12 | end |
| 1b | DM | 38 x 12 | ? | 270'000 | -14'584/12 | 0 | 12 | end |
| 2 | SlideRule | 360 | 15% → 12% | 100'000 | ?-? | 0 | 12 | end |
| 3 | Kahan 1983 | 60x60x24x365 | 10% | 0 | -0.01 | ? | =N | end |
| 4 | DM | 480 | 0 → ? | 100'000 | ?→ PMT | 0 | 12 | end |
| 5 | Dieter | 10 | ? | 50 | -30 | 400 | 1 | end |
| 6 | Dieter | 10 | ? | 50 | -30 | 80 | 1 | end |
| 7 | A Chan | 10 | ? | -100 | 10 | 1e-10 | 12 | end |
| 8 | Miguel | 32 | ? | -999'999 | 0 | 1e6 | 1 | end |
| 9 | DM | ? | 25 | 100000 | -2083.333334 | 0 | 12 | end |
| 10 | DM | ? | 25 | 100000 | -2040.816327 | 0 | 12 | begin |
| 11 | robve | 60x24x365 | 1/6% → ? | 0 | -0.01 | ?→ FV | =N | end |
| 12 | robve | 40 | ? → I%YR | 900 | -400 | -1000 → ? | 1 | begin |
2: https://www.hpmuseum.org/forum/thread-20707.html
3: https://www.hpmuseum.org/forum/thread-1012.html
5, 6: https://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv021.cgi?read=234439
7: https://www.hpmuseum.org/forum/thread-18359-post-161549.html#pid161549
8: https://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv017.cgi?read=120592
11, 12: https://www.hpmuseum.org/forum/thread-16565-page-2.html
Puzzle 2 is from here, and needs you to calculate PMT given n = 360, I%YR = 15%, PV = 100'000, FV = 0, then calculate PMT, but with I%YR = 12%. Subtract the two results, and put that back into PMT, then change n = 36 and I%YR = 15% again, and calculate PV.
Puzzle 3: you may need to divide I%PY by N depending on how your calculator handles i vs I%YR and what the limit is on P/YR.
Puzzle 4 needs you to calculate PMT first given I%YR = 0, then re-input this back into PMT and calculate I%YR. On the HP-12c this is best done by pressing x<>y twice before putting back into PMT.
Puzzle 11: calculate for FV first, re-input back to FV and compute I%YR.
Puzzle 12: calculate for i first, re-input back into i and compute FV.
The other puzzles are just a solve for '?'.
They can be a bit confusing, so I also did a couple of videos here and here solving them on a DM-42 and HP-12c.
Really glad you enjoyed it!! It's a very very small niche of people I think.
Totally would love to work on an edge cases database! It is no secret (posted on swiss micros forum), but I can do a submission here if that works?
It's actually a really nice bit of software. Really nice range of functions.
Yes, looks like coated aluminium - not unlike a can but a little thicker and with no sharp edges. I've not seen these before but I think they are disposable/recyclable - i.e. a replacement for a plastic cup and far more pleasant to drink from. I took mine home as a souvenir, but I have had to unsquish it today taking it out of hold luggage.
Yes, in fact before I got my DM42 I had one holiday where we had no internet access in the evenings and as the children were small and slept early, I didn't have much to do but I was able to learn a lot about using and programming free42.
You do have to remind yourself at the beginning that you're using RPN, but after a while it feels a bit like working sums out on paper.
A random shot of my calculator 5000 miles from home while I enjoy a beer near the Pacific. We had been discussing how much water was on earth and what size of a ball it would make. I have no affiliation with the brewing company so apologies for the product placement.
Just to clarify - means two taps of the esc key in succession will clear highlighting (ps I'm curious how other people do it!).
nmap <esc><esc> :noh<return>
HP's most accurate financial calculator, oddly enough, and despite only returning the ceiling of solve-for-n.
First post on Lemmy, and i see you like pens too :)
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Respect for the 4 level stack!