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Enter Key Double Click

Posted: Thu Oct 29, 2020 2:19 am
by warc1
I'm a new DM42 owners and am very pleased with it with one exception. Pressing the "Enter" key often results in a double click in tactile response which just feels wrong. Fortunately, it doesn't result in the calculator interpreting this as two separate key presses. It always responds as if the "Enter" key was pressed just once. Still, I've never experienced this on any of the number of HP calculators that I've owned. Is this normal?

Re: Enter Key Double Click

Posted: Thu Oct 29, 2020 10:25 am
by bernouilli
This is kind of "normal" since the ENTER key has two swicthes (domes) and if you press right in the middle, you manage to press them both.
The hp41 doesn't have this problem since th ENTER key only has 1 dome in the middle.
I suppose there is some reason why SW put 2 domes instead of 1 under the ENTER key.

Re: Enter Key Double Click

Posted: Thu Oct 29, 2020 10:52 am
by firai
It's normal for the DM42 and 41X. You might notice that the ENTER key spans exactly two columns of keys (as compared to the keys above), and there are indeed two domes under the ENTER key that align with the columns above. I'm guessing that SM did it this way to avoid the additional complexity of a custom switch layout at that location given the relatively small scale of production. My understanding is that the interpretation of those two keys as one key is done at the firmware level.

It feels a little weird at first, but on the bright side, the ENTER key is secure along the whole length this way. After years of use, my HP 35S ENTER key is now very loose where it's not directly supported by a dome, just like a tooth that's about to fall out.

Re: Enter Key Double Click

Posted: Thu Oct 29, 2020 11:55 am
by Walter
Mechanically, guiding a wide key in a way it hits one dome properly shouldn't have been a problem - compare HP's designs through decades. But there may have been reasons for SM I can only speculate about. At the bottom line, most important is proper functionality overall.

Re: Enter Key Double Click

Posted: Sat Oct 31, 2020 6:29 am
by warc1
Thanks for the explanation. Knowing that, I've discovered that pressing the key off center to either side will usually result in just one click. That's a sufficient work around for me.