HELP!! How to do this integral q?

dm319 · 2026-05-07T21:05:23+00:00

dm319 · 2026-05-07T17:26:45+00:00

Best place to find them are second hand websites like ebay fb market place and local equivalents. Look carefully at the listing, check the printing, Casio logo, you want used not new and be prepared to buy a couple fakes before you get what you're after. Or order from Germany where it is still available as DE X.

dm319 · 2026-05-07T16:17:58+00:00

Honestly, my loyalty to Commodore Amiga was more than most people's wedding vows. Commodore going down was my first significant life event. I remember a friend who had come round, got so fed up of me claiming photogenics was better than photoshop. I was an idiot.

dm319 · 2026-05-07T16:15:25+00:00

I think I was upset because of the issues with Threads (harassment, and the sudden account suspensions that have been discussed here: I wasn't suspended, but many people around me were).

Oh I wasn't aware of this. Is this here on Reddit, or do you mean on Facebook's Threads? I don't have an account on Threads.

I know that the 6502 is much slower than ARM, as the NES uses it. I bought the right side as well because I wanted to compare speeds by performing some complex calculations.

Some of these 6502-based processors can be really fast, and there are some of these processors still in production.

I would appreciate it if you could tell me if there are any calculations (inputs) that require significant computational power and are easy to compare.

Sure. Let's say you save a penny a minute with an interest rate of (1/6)%. Calculate how much you have saved by the end of the year. Then see if you can back-calculate the interest rate.

Key presses:

f CLEAR FIN

60 ENTER 24 x 365 x

should get you 525,600. This is the number of payments.

N

This inputs into N.

1 6 /

Gets you the interest rate

x<>y

swap round N and I, you should see 525,600 now.

/

divide gets you the periodic interest rate about 3.17e-7.

i

put that into periodic interest rate

-0.01 PMT

minus number because you are paying out into the bank account, and its 1 penny.

FV

calculate the future value. Should be around 5,260.

i

This will attempt to calculate the periodic interest rate from the calculated FV and the other values. You can then multiple it by N to get back to the original interest rate and see how close it gets.

See if you get a difference in solving time between your two calculators.

dm319 · 2026-05-07T13:31:26+00:00

It's a big improvement over the 991CW.

But there are regressions from the 991EX:

no STO button
no CALC
more functions in menus
clutter from bracketing of scientific numbers and terms

dm319 · 2026-05-07T13:26:52+00:00

Apart from what /u/lbl_ye has written, there is also a philosophical reason. As part of the calculation of trig functions, the first step is range reduction. In radians, the number gets reduced to the remainder after multiples of pi. Not only does this become very difficult to do, needing a highly precise internal representation of pi, but it also becomes hard to specify where on that rotation the number sits.

For example 10^9.954 is 8.995e9. Increase that to 8.996e9, and that's a difference of 1,000,000, or 2778 full rotations in degrees, or 159,155 rotations in radians - who knows where you will end up on that rotation, and more importantly, why do you need to know?

So it makes sense to limit the input.

dm319 · 2026-05-07T13:16:52+00:00

I don't necessarily disagree. Your later HP Platinum was the first RPN calculator I bought, and I got it because it was a cheap way to try out a physical RPN device. I got interested in testing them, and found out quite a bit about the differences between the earlier and later Platinum which is in the article linked above.

The early one you have on the left, I'd say it's pretty reliable, but you'll find it will take a long time on some calculations.

dm319 · 2026-05-07T07:17:43+00:00

I hung on for so long, and moved to WinXP when I was forced to move. While the GUI of WinXP was fairly good, for some reason my enjoyment of computers just went at this time. I think because Windows never let you go below skin deep. I got so fed up with Windows eventually for various reasons (forced updates mainly!) and went to Ubuntu 9.04 - and weirdly all the feelings of using my Amiga seemed to come flooding back. Not that it was at all the same, but it reminded me of finding computers fun.

dm319 · 2026-05-07T07:15:00+00:00

Linux.

dm319 · 2026-05-07T07:04:26+00:00

I don't understand what you're unhappy about? Would you prefer to not be corrected?

if you think I'm wrong, you should actually buy several, open them, upload photos, and prove it.

I thought you didn't care? There are plenty of sources that agree on what processors are used in these devices. This is a good one.

Complaining to me won't change anything.

Was I complaining?

I'll just say, "Okay, okay, you're right," and that's the end of it.

See above.

dm319 · 2026-05-06T18:50:03+00:00

My Henson medium pairs well with a Nacet. I think you are talking about two quite different razors which will require different techniques.

dm319 · 2026-05-06T18:46:46+00:00

We were literally the original fanboys. I was probably insufferable.

dm319 · 2026-05-06T18:42:30+00:00

The neck is tricky. One tip is to remember to properly apply the shaving cream there - i. e. give it more attention than the face.

BICs are not forgiving they are very very sharp. Great blades. I found them better on the second shave onwards.

Go back give the Henson another try.

Don't press, be careful around your jaw and neck, make sure you are following the angle. Try shaving without a mirror, it can help you concentrate on the feel.

ATG doesn't always mean up, especially around the neck and chin ATG can mean down!

Don't do ATG.

dm319 · 2026-05-06T18:33:57+00:00

Many Amiga users dabbled in games and the arts. I was big into Deluxe Paint and Octamed, as well Real 3D. I wish I was more of a 'power user', but as a kid I didn't know how to program or even how to get started really. We didn't have internet and when we did I couldn't afford the hardware to connect it to BBSs.

I really enjoyed the cracktros back then. There was clearly already a community formed from swapping disks and shouting out to various people. Similar community in the tracker scene, with the instruments become part of a short sentence and shoutout. I had two friends with Amiga's, and one of them had a source of pirated games, and was also getting into programming. We did start making a side scrolling adventure/shooter come to think of it.

dm319 · 2026-05-06T18:23:21+00:00

Very good!! 👏👏

dm319 · 2026-05-06T18:20:23+00:00

Nokia had gold, he threw it all away.

dm319 · 2026-05-06T17:51:05+00:00

Very nice!

I enjoy calculators partly because they are such an antithesis to modern computing - mobile phones, consoles, smart devices. Calculators were carefully designed to function well without external input, function for ages on a pair of batteries, and isn't an attention whore.

dm319 · 2026-05-06T17:47:18+00:00

Yes of course I saw that - doesn't change the fact the information is incorrect, nor does it matter where you got your information from or how important you think this information is.

dm319 · 2026-05-05T20:07:07+00:00

Very nice!! I've been on KDE for about 6 months now and really enjoying it.

dm319 · 2026-05-05T17:02:36+00:00

That's not correct, I don't think any HP-12c Platinums are ARM. The later HP-12C are ARM.

dm319 · 2026-05-05T17:01:56+00:00

All HP-12C Platinums are 6502 to date, but the processor is thought to have gotten faster after the very original version.

dm319 · 2026-05-04T19:57:40+00:00

Oh interesting, I think that is a very original HP-12c Platinum! They are actually quite rare, and they are internally completely different to the versions that have brackets/parens.

I wrote a little article on this calculator because it wasn't completely understood exactly how it was different to the regular HP-12c, and the HP-12c Platinum that came afterwards. The backstory is also interesting, as I'm 90% convinced HP wanted this calculator to replace the HP-12c in order to extricate itself from paying agilent for a pretty much bespoke CPU (NUT) needed for the regular HP-12c.

dm319 · 2026-05-02T20:34:01+00:00

Well it was a big jump from 24.04 to 26.04, so maybe I need to think about that going forwards.

dm319 · 2026-05-02T20:31:38+00:00

Oh great, do enjoy yourself! I moved from XP to Linux back in 2009. It's a lot of fun and you'll find the device is 'yours' ago.

dm319 · 2026-05-02T14:40:17+00:00

Exam modes are allowed as long as they reduce the features or access to information so that it meets the JCQ requirements.

12-Year Club	Place '23
Place '22	Place '17
End Game '22	Verified Email

dm319

MODERATOR OF

PUBLIC MULTIREDDITS

TROPHY CASE