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NumWorks open source calculator
09-06-2017, 05:59 PM
Post: #41
RE: NumWorks open source calculator
The calculator forensics calculation returns 8.966758 (for 9 degrees) on this device and it seems to always display results to 7 significant figures. Calculation precision seems therefore to be on the low side.

Is it perhaps squandering higher levels of precision by carrying forward rounded up/down display values rather than underlying register values?
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09-06-2017, 08:08 PM
Post: #42
RE: NumWorks open source calculator
(09-06-2017 05:59 PM)Chasfield Wrote:  The calculator forensics calculation returns 8.966758 (for 9 degrees) on this device and it seems to always display results to 7 significant figures. Calculation precision seems therefore to be on the low side.

Is it perhaps squandering higher levels of precision by carrying forward rounded up/down display values rather than underlying register values?

I tested the expression:

(355/113 - pi)/pi * 1e9

I got a unit 2 days ago!! I was able to update the firmware version this morning.

The new firmware version of 1.1.0 gave 84.91xxxx which is good. The previous firmware version of 1.0.3 gave a higher number (did not think to record it) which reflected poorer accuracy. SO it seems the new firmware version has enhanced accuracy.

Namir
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09-06-2017, 08:10 PM
Post: #43
NumWorks User manual!!!!!!!!!!
Where is the detailed manual for using the NumWorks calculator? I looked online and the User manual was a single web page. Did I miss a download link somewhere?

Nam9r
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09-06-2017, 08:49 PM
Post: #44
RE: NumWorks open source calculator
now grab the x48 code from sourceforge and port it over Smile
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09-06-2017, 10:21 PM (This post was last modified: 09-06-2017 10:30 PM by Luigi Vampa.)
Post: #45
RE: NumWorks open source calculator
(09-06-2017 08:08 PM)Namir Wrote:  (355/113 - pi)/pi * 1e9

I got a unit 2 days ago!! I was able to update the firmware version this morning.

The new firmware version of 1.1.0 gave 84.91xxxx which is good. The previous firmware version of 1.0.3 gave a higher number (did not think to record it) which reflected poorer accuracy. SO it seems the new firmware version has enhanced accuracy.

Namir

... some more digits from Free42 ;0)


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09-06-2017, 11:17 PM
Post: #46
RE: NumWorks open source calculator
(09-06-2017 10:21 PM)Luigi Vampa Wrote:  ... some more digits from Free42 ;0)

Not bad, but the final 8 digits are incorrect. HP 50g with LongFloat installed yields as many digits as you ask for:

84.913678658370862584021992894198817243148...

X<> c
-Joe-
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09-07-2017, 09:35 AM
Post: #47
RE: NumWorks open source calculator
(09-06-2017 05:59 PM)Chasfield Wrote:  The calculator forensics calculation returns 8.966758 (for 9 degrees) on this device and it seems to always display results to 7 significant figures. Calculation precision seems therefore to be on the low side.

Is it perhaps squandering higher levels of precision by carrying forward rounded up/down display values rather than underlying register values?

One bug is that the 'ans' memory re-parses the displayed textual output of the last answer as its input. So for example:

1/9*9 = 1
1/9 = 0.111111
ans*9 = 0.999999
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09-07-2017, 07:19 PM
Post: #48
RE: NumWorks open source calculator
(09-06-2017 08:10 PM)Namir Wrote:  Where is the detailed manual for using the NumWorks calculator? I looked online and the User manual was a single web page. Did I miss a download link somewhere?

Nam9r

They have it currently fully available only in French, please see
https://www.numworks.com/fr/ressources/manuel/

Hubert
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09-09-2017, 03:34 PM
Post: #49
RE: NumWorks open source calculator
(09-06-2017 08:10 PM)Namir Wrote:  Where is the detailed manual for using the NumWorks calculator? I looked online and the User manual was a single web page. Did I miss a download link somewhere?

Nam9r

I didn't see a full manual on their web site either, which is troubling.
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09-09-2017, 05:09 PM
Post: #50
RE: NumWorks open source calculator
Got my device yesterday, and looked 'under the hood'...

(08-29-2017 03:57 PM)mfleming Wrote:  The last page of the schematics indicate connectors for QUADSPI, USART, SPI and microSD. No mention is made of any of these connectors on the web site, so I'm sure they're not populated . . . but could be?

What is called USART (U7) is a 64 Mbit flash memory, wired for QuadSPI. The pads for are on the board, same as for the microSD (U8) with resistor/FET (R15/Q4), all of them are not populated.

(08-29-2017 03:57 PM)mfleming Wrote:  The processor supports USB OTG, but the USB ID pin is left floating (pity!) so it can only be used in device mode. I wonder if the pin is brought out to an appropriate TP?

All five USB pins are available directly at the USB connector. So it may be possible to connect the respective microcontroller pin to the USB connector with a very thin wire.

I made some pictures of the board, they are available at Pictures Calculator

Hubert
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09-11-2017, 01:06 AM
Post: #51
RE: NumWorks open source calculator
Tested some number expressions on NumWorks. The software is very limited to execute math operations. Tested ln(-1) and gave undef as a result instead of i*pi. Is any English manual available for this calculator?
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09-11-2017, 11:25 AM (This post was last modified: 09-11-2017 11:29 AM by toml_12953.)
Post: #52
RE: NumWorks open source calculator
(09-11-2017 01:06 AM)Anderson Costa Wrote:  Tested some number expressions on NumWorks. The software is very limited to execute math operations. Tested ln(-1) and gave undef as a result instead of i*pi. Is any English manual available for this calculator?

The only manual I could find is a one-page, useless document at

NumWorks Manual

I was thinking of getting a unit but the software is very immature and the Python implementation is a joke. I'll keep an eye on it, though, since it may get better in the future if the creator can keep from going bust.

Tom L

DM42 SN: 00025
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