Search found 24 matches

by Helix
Thu Nov 30, 2023 1:55 am
Forum: Discuss!
Topic: My Two Wishes Swiss Micros - Everyone reply with yours?
Replies: 36
Views: 8387

Re: My Two Wishes Swiss Micros - Everyone reply with yours?

1. DM48 or DM50, ie a new platform with an additional row of keys compared to the DM32-41X-42, appropriate markings to avoid to put stickers, and a firmware written by Christophe de Dinechin. 2. DM71B with of course the ability to load plenty of modules. 3. DM15C with alphanumeric instructions inste...
by Helix
Sat Jun 10, 2023 3:46 pm
Forum: Discuss!
Topic: Trigonometric/transcendental function accuracy
Replies: 80
Views: 21628

Re: Trigonometric/transcendental function accuracy

Rational approximations seem to be commoner in my experience than polynomial ones. Indeed, I should have written: the best polynomial approximation is the minimax approximation. I don’t know which methods are used in common math libraries. But I highly doubt they use Taylor series, as the article p...
by Helix
Sat Jun 10, 2023 2:49 am
Forum: Discuss!
Topic: Trigonometric/transcendental function accuracy
Replies: 80
Views: 21628

Re: Trigonometric/transcendental function accuracy

This was posted on HackerNews last week, and I found this a similarly fascinating article: https://austinhenley.com/blog/cosine.html Taylor series are inefficient to approximate functions over an interval. The best method is to use a minimax approximation. Here is a simple introduction: https://www...
by Helix
Sun May 21, 2023 3:24 pm
Forum: C47/C43, WP43, WP34S
Topic: C47 Classic single shift, replaces C43 on DM42
Replies: 777
Views: 70484

Re: C47 Classic single shift, replaces C43 on DM42

Out of curiosity, what do you consider to be a "full doc"? I know Walter's manuals for the WP43 have been mentioned to you. Imo, they are a mammoth effort, but also quite a substantial read - the Owner's Manual alone is 351 pages and the Reference Manual is 322 pages (current versions on ...
by Helix
Sun May 21, 2023 3:13 pm
Forum: C47/C43, WP43, WP34S
Topic: C47 Classic single shift, replaces C43 on DM42
Replies: 777
Views: 70484

Re: C47 Classic single shift, replaces C43 on DM42

Those sheets are not redundant. They are accurately documenting every single function on the calculator in a minimal but effective way which you can predict. Just an example with the function LINPOL: I couldn’t find in the files how it works. I need more background. (Which is probably in the WP43 m...
by Helix
Sun May 21, 2023 3:08 pm
Forum: C47/C43, WP43, WP34S
Topic: C47 Classic single shift, replaces C43 on DM42
Replies: 777
Views: 70484

Re: C47 Classic single shift, replaces C43 on DM42

Thank you very much RjvM, Jaymos and H2X for your detailed responses. I hoped a user manual indeed, not a technical reference. My wording was inaccurate. I’ve no doubt that creating a complete manual is a huge task, and I know that Walter’s manuals are highly praised. I take note that I should begin...
by Helix
Sun May 21, 2023 2:20 am
Forum: C47/C43, WP43, WP34S
Topic: C47 Classic single shift, replaces C43 on DM42
Replies: 777
Views: 70484

Re: C47 Classic single shift, replaces C43 on DM42

Out of curiosity, I’ve downloaded the C47 files to have a look at the documentation, and I can say I’m greatly disconcerted. I can’t find any doc, only an overwhelming list of 219 redundant pdf files, each being a list of functions, without explanation on how to use them. It’s not what I call a docu...
by Helix
Fri Sep 23, 2022 10:13 pm
Forum: Discuss!
Topic: Collection of wishes for future SwissMicros products - discussion following Bob Prosperi's HHC 2022 talk
Replies: 111
Views: 16473

Re: Collection of wishes for future SwissMicros products - discussion following Bob Prosperi's HHC 2022 talk

71b, emu72, palmtops, Linux pocket computer: This would mean a new hardware platform. But everything mentioned in that heading could fit on the same hardware platform, and it might be very awesome. http://www.jeffcalc.hp41.eu/emu71/emu72.html This is exactly my wish! I would like a modern reincarna...
by Helix
Wed Jan 13, 2021 1:47 am
Forum: Discuss!
Topic: May 2021 Speculations
Replies: 373
Views: 105857

Re: May 2021 Speculations

DM71 :mrgreen:
by Helix
Fri May 29, 2020 12:24 am
Forum: DM42
Topic: My DM42 Is lost
Replies: 38
Views: 17945

Re: My DM42 Is lost

And I received today my classic boards from teenix, after a 70 days trip from Australia. :? I ordered a HP-67 board from Teenix well before the pandemic restrictions, and the delay was already 24 days. Unfortunately, my board never worked correctly, and I had to return it to Australia. :( I don't e...