WP43 News

This area is for discussion about these families of custom high-end Scientific Calculator applications for SwissMicros devices.
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Walter
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Re: 43S News

Post by Walter »

rudi wrote:
Sun Jul 24, 2022 8:31 am
... I am looking forward to get a real hardware manifestation of the 43S.
@rudi: Believe me, we are looking forward to it as well. But looking forward to it is just not enough ...

also @rprosperi: Thanks for your friendly words.

@all: Nevertheless, there's a significant error on p. 206 of the Reference Manual. For the time being, please insert after step 3:
qspi.png
qspi.png (9.85 KiB) Viewed 1388 times
Then proceed. (I can't verify this right now since I've got a DM42 in cerebral coma - no wake-up call succeeds.)

@Michael and David: How to wake up a DM42 which doesn't react on PGM - RESET - PGM ?? :? Battery is fine. Besten Dank vorab für sachdienliche Hinweise.
WP43 SN00000, 34S, and 31S for obvious reasons; HP-35, 45, ..., 35S, 15CE, DM16L S/N# 00093, DM42β SN:00041
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rudi
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Re: 43S News

Post by rudi »

Walter - have you tried pressing the bottom row keys, frantically! That’s what got my DM42 out of it’s coma (Thanks to Bill). Before that, it didn’t even display anything meaningful on the display, just random pixels all over.
/Rudi

DM-42 (s/n 06999), HP-42S, HP-35s, HP-11c, HP-32SII (ex HP-41CV, ex HP-75C, ex HP-48G + a lot, really lot of a accessories)
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Walter
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Re: 43S News

Post by Walter »

Hmmmh, frantically pressing something does neither look like science nor engineering to me. Please let me wait for a more reasonable offer.
WP43 SN00000, 34S, and 31S for obvious reasons; HP-35, 45, ..., 35S, 15CE, DM16L S/N# 00093, DM42β SN:00041
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rudi
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Re: 43S News

Post by rudi »

Walter wrote:
Sun Jul 24, 2022 12:41 pm
Hmmmh, frantically pressing something does neither look like science nor engineering to me. Please let me wait for a more reasonable offer.
He he - well, it worked…
If there’s a more systematic and reliable method, I would like to know for the next time ;-)
I’m just happy, that I managed to revive my calculator.
/Rudi

DM-42 (s/n 06999), HP-42S, HP-35s, HP-11c, HP-32SII (ex HP-41CV, ex HP-75C, ex HP-48G + a lot, really lot of a accessories)
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Bill K. - USA
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Re: 43S News

Post by Bill K. - USA »

Walter wrote:
Sun Jul 24, 2022 12:41 pm
Hmmmh, frantically pressing something does neither look like science nor engineering to me.
I recommend trying it, Walter. If it does work for you, that'd be three-for-three locked-up DM42s revived by the same process: and that is science--doing experiments to test a hypothesis.

If this does prove to be a reproducible process, then it could be the first step in gaining an engineering understanding of what is going on:
--maybe there's a dual-press key combination that kicks the calculator out of its loop, or
--maybe the fast closing of so many key-press circuits temporarily draws the battery to a lower "brown-out" voltage and that somehow triggers a deeper reset, or
--maybe there's only a very brief window in the locked-up cycle when the calculator can accept new input, or
--maybe if the calculator OS receives too many key inputs too quickly, it can't process them, and the asynchronous interrupts jam on top of each other and interrupt the interrupt-handling loop.

I'm not claiming voodoo fixed my locked-up calculator: I know there's an engineering reason why my mad button pressing worked--I just don't know what that reason is. But if we can establish that the process works reliably, then maybe we can zero in on and refine the instructions.

But in any case, my calculator was in limbo, and I tried everything I could find in the documentation to revive it and nothing worked, but the key mashing did it. (My calculator was connected to a computer at the time with a USB cable, another factor that might--or might not--be important.)
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Walter
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Re: 43S News

Post by Walter »

Bill K. - USA wrote:
Sun Jul 24, 2022 6:09 pm
Walter wrote:
Sun Jul 24, 2022 12:41 pm
Hmmmh, frantically pressing something does neither look like science nor engineering to me.
I recommend trying it, Walter. If it does work for you, that'd be three-for-three locked-up DM42s revived by the same process: and that is science--doing experiments to test a hypothesis.
Science is doing carefully planned experiments based on prior knowledge. See the difference?

I bet SM has experienced such lock-in states more than once so far. Obviously, the PGM-RESET-PGM procedure as described in their DM42 documentation isn't everything, so their manual is incomplete. Instead of letting us find out what SM already knows, I'd simply appreciate if SM share their knowledge in this matter.
WP43 SN00000, 34S, and 31S for obvious reasons; HP-35, 45, ..., 35S, 15CE, DM16L S/N# 00093, DM42β SN:00041
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Walter
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Re: 43S News

Post by Walter »

I got my 43S resurrected by powering it via USB. (No use in frantically pressing any keys in my case.)

Actually, the freeze state was caused by a ccc battery, delivering 3.0 V open circuit voltage but breaking down immediately after inserting. Its power did neither suffice to process any keystroke nor to drive a reset. Powered through USB, everything was fine. After flashing etc. I exchanged the fresh ccc battery against a fresh Varta CR 2032 and the 43S is running like a charm again.

And the moral of this story: Keep off from ccc batteries!
WP43 SN00000, 34S, and 31S for obvious reasons; HP-35, 45, ..., 35S, 15CE, DM16L S/N# 00093, DM42β SN:00041
H2X
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Re: 43S News

Post by H2X »

Walter wrote:
Tue Jul 26, 2022 2:10 pm
And the moral of this story: Keep off from ccc batteries!
What is a ccc battery?
What is the metric tensor in imperial units?
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PierreMengisen
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Re: 43S News

Post by PierreMengisen »

China Compulsory Certification (CCC)
Pierre
[TI59 with PC100C; TI-84 Plus CE-T; HP41CV with HP IL loop & 2*82161A DCD & 82162 TP; HP15C; HP28S; DM41; DM41L; DM42; DM41X]
HPMike
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Re: 43S News

Post by HPMike »

H2X wrote:
Tue Jul 26, 2022 2:23 pm
Walter wrote:
Tue Jul 26, 2022 2:10 pm
And the moral of this story: Keep off from ccc batteries!
What is a ccc battery?
Cheap Chinese Crap
DM15L, S/N 00548. DM42, SN: 00159. DM41X, SN: 00973. DM32, SN 00054.
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