I still have a HP48GX in nearly-new condition. That doesn’t mean it hasn’t been used though… just that I’ve taken good care of it. For a long time I had it thoroughly loaded up with programs (er, user RPN scripts) I made. Unfortunately though, it later lost everything I had installed, and I didn’t have a good backup.
Since I liked it so much, I also made my own RPN-based calculator, for use on my Linux PDA. I never got around to giving it functions for graphing or symbolic algebra, but it was still a handy thing to have around for more basic functions.
This is what I used in school — count them digits!
Later I had an HP-15C — a lovely calculator. I sold it on e-bay some years ago because I was not using it, and it needed to go somewhere where it would be appreciated more. My mobile has some RPN calculators on it, even some the look like the HP-15C, but I don’t use calculators these days and instead fire up Excel even for simple tasks.
Back on topic: I’ve ordered the D4S with Neutral White - XP-L HI V2 5D, 4000K .
Looks very much like my 15C on my desk at work. I used it once or twice a year for some calculations. The display has a black area at the bottom, but it still works just fine. Can’t remember the last time I changed batteries, must be over 20 years ago.
I was a geek on the pocket calculators when they first came out. The LED’s would eat up cells in no time! I was all about the smallest, tiniest calculator I could find. My Aunt bought me one that was like two pens, it opened down the length to show the keyboard on one side and display/battery compartment on the other. Sharp I believe it was. One of my first LCD models.
Studied Cobol in college, and keypunch. Dropped it due to heartbreak caused by a certain blue eyed wonder that loved acting, especially enticing me with a British accent…. ironically enough (and I don’t think I ever even realized this) her initials were also DB. lol [circa 1980]
Just found this awesome forum after shopping for som flashlights. I live in Norway with long dark winter nights and I’ve used some old cheap bulb-flashlights until recently when I found a Nightcore HC-60 and discovered how nice these 18650 led lights could be.
I have now placed an order for Emisar D4, Convoy S2 (+ diffusor for lantern usage at power drop) and a Astrolux MF02S. I totally lost it for cool flashlights so even now without any of these in my hand due to slow shipping I looking at new ones… Just discovered this D4S and regret that I didn’t get that instead of the D4… Is it a big difference so I need both? Might be the wrong place to ask such a question
The HP48 calculator series was particularly interesting. In addition to the usual RPN stuff, the visual graphing stuff, and the symbolic formula manipulation, what made it really special was that it had a hierarchic filesystem. Users could store and organize arbitrary files, create their own library of functions and scripts, even create entirely new software for it to add applications or completely change how the calculator worked. And it had an active community building and sharing neat new things for it.
The main drawbacks were that it was fairly slow and connecting it to a computer was inconvenient. It was no worse about these things than other products at the time, but it sure could have benefited from a faster processor and a USB port.
I need to get some 26650s for the incoming D4S, ideally bought in the UK
I cannot find a UK seller for the LiitoKala 5000mAh 26650 cell (I don’t count un-recommended sellers from e-bay or amazon), but I can find UK sites I would be willing to buy 26650s from, for:
I understand the mAh (bigger is better, if all else is equal I believe)
But I don’t understand the Amp requirement for a D4S, and the description for the above cells (e.g. (20A/ 75A)
Would anyone be able to recommend some cells? I presume I’m going for unprotected flat tops.
FWIW, even with the D4S’s increased thermal mass, turbo is still meant for relatively brief use. Higher-mAh cells work better at the lower, saner levels where the light will most likely spend most of its time. It can, for example, make the difference between 12 hours of runtime and 16 hours of runtime.
Keepower are normally pretty decent. I’ve not heard about this 6000 mAh version before, never-mind the protection circuitry which I would usually avoid, but it might be worth a look.
I installed RealCalc and a few others back in 2011 or 2012, but I haven’t used any of them in years. Mostly I just use python’s CLI as a calculator now. Anything without a programming language built in hardly seems worthwhile any more.
Dropped it due to heartbreak caused by a certain blue eyed wonder that loved acting, especially enticing me with a British accent…. ironically enough (and I don’t think I ever even realized this) her initials were also DB. lol [circa 1980]
