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Zaphod wrote: ↑

Thu Apr 05, 2018 9:52 am

But a (thin foam etc) sheet could be added to damp down any excess noise of operation perhaps.

Between what would you want to put anything like that in the DM42?

I have some surface mount dome switches here that you can't really hear, the dome is more or less exposed (Kapton film over the top) but on it's own substrate. It depends a lot on how everything is put together. Of course the switch is on a PCB in the end, but try putting a single one on a wooden s...

The nitpicking part is that I would personally prefer a bit softer feel - like the best HP's. How did they manage it? As mentioned, the force needed on the domes depends on their thickness. Then the plastic hinge of each button adds up too to the total force needed. The thinner the domes and the hi...

The decision has been made, obviously, but how noisy were they? What kind of switches were considered? I tried many different kinds. They all were too noisy, NG for use in a library or during a test. All have some dome inside, the diameter and the thickness of the dome affect how they sound and the...

Zaphod wrote: ↑

Wed Apr 04, 2018 8:59 pm

Was there a particular reason why, say , low profile surface mount tact switches weren’t used instead ?

The reason for not using tact switches is because they are too noisy.

alcuin wrote: ↑

Wed Mar 28, 2018 8:45 am

hardware related proposal.

43S could have USB OTG?

thanks

While the CPU is technically capable of USB OTG, the PCB doesn't power anything attached to USB.

The calculators are produced in China, final assembly is in done in Switzerland and that's also where they ship from.
I've just been visiting the production sites, see this video https://www.facebook.com/jeremy.chatela ... 105169073/

The DM42 case is stainless steel, sandblasted and PVD coated

The size of the BMP about 12.6kB
I checked a few and found only these three numbers:
12'610 bytes
12'544 bytes
12'542 bytes

My keyboard has very poor feedback. I have the same issues with the enter key that many other have, and other keys are worse, the "0" key being the worst of all. It is almost unusable unless I watch the screen for each press. This is the same unit as here https://forum.swissmicros.com/viewtopic.php...