General > General Technical Chat
Do you still use stand-alone ("pocket") calculators?
Prehistoricman:
--- Quote from: Mortymore on January 19, 2020, 12:03:23 am ---Integral of ln(x^2)dx, from -5 to 99 (EDIT: as can be seen in the photo, on Casio FX-991ES display)
Casio FX-991ES -------- 3m15s -------------- 717.9281095
HP 39G II ---------------- 7s ------------------- 717.928109451
HP 49G+ ----------------- 25m 38s ----------- 717.928325369
HP 40GS ----------------- 20m48s ------------ 717.928325369
HP 49G ------------------ 54m54s ------------- 717.928325369
HP 48G -------------- was not able to solve
Microsoft Mathematics on a i5 ---- 0s ------ 717.9281094509898
When applicable, HP 40GS, 49G and 49G+ had to be configured for complex and approximation mode, otherwise they couldn't solve. Hence the difference in the results from the 4th decimal digit.
HP 39G II (not in the photo) was a bit of a surprise. It was very fast. This calculator has a peculiarity I've never seen in any other battery powered device (excuse my lack of knowledge if that's the case). It has a compartment for 4 AAA batteries, but can run with only 1 AAA fitted.
--- End quote ---
Interesting test. I have a Casio fx-9750GII here that also takes about 7s to solve that and gives 717.9281094(50611 - these digits were obtained by subtracting 717.9).
It also takes 4x AAA but doesn't run with only 1. I believe all 4 are in series. An old trick I used to do in school (I was the heart of the party) was to replace one of the batteries with a short pencil and show that the calculator would work.
aargee:
Would love one of these, more as curio than anything... but wow the price it ended at today!
https://www.ebay.com.au/itm/Casio-Fx-61f-Scientific-Calculator-Electric-Formula-27/293421709079
as a general calculator, its physical condition probably wouldn't have gotten a second look in an op-shop.
Berni:
Ah yes having built in electronics engineering features would make it really nice. Especially being able to parallel resistors with just one operator.
But dang that price.
IanJ:
--- Quote from: blacksheeplogic on January 15, 2020, 05:07:13 am ---My wife has found and 'put away' a lot of my calculators and no doubt she will eventually find these as well.....
(Attachment Link)
--- End quote ---
Oooh, you have an EL-5155.......I have 2off EL-545 which use daily at work and in the workshop at home.
Not sure the difference but physically identical just about.
Ian.
ogden:
I am not fan of look and feel (nor price) of it, but otherwise calculator running STM32F4 + TFT LCD with code on Github sounds like good idea. https://www.numworks.com/. Disclaimer: not related in any way, found info in ST news releases. Online simulator here
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version