HP Keypad Thing

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Compgeke

HP Keypad Thing

Unread post by Compgeke » 05 Aug 2018, 17:37

Here's an odd one, an HP keypad from 1970 or so. Not sure what it's from but it looks like it was repurposed for a security camera setup at one point or another.

So it's big and it's metal. Weighs a ton too.
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The key mount is...oh, that's interesting.
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Now that is a long shaft. Double shot too. O-Ring for some reason, they don't do much (at least not anymore).
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Cool. All the switches are secured to the bottom half of the board and that long shaft presses through a hole in the PCB and actuates the switch. The silver switches are lighter than the copper ones.
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Close up of the P/N. With some CSI enhancement we can see the date codes range from late '69 (6948) through earlyish '70 (7012).
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Here's a pic of a switch in the unpressed position. You can see the small contact on the middle plate that when pressed whacks the top contact. It's a very simple switch and very tactile and clicky.
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When you press a key, it pushes that shaft down and pushes up on the right side arm, which pulls the middle up where it whacks the top contact.
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xxhellfirexx

Unread post by xxhellfirexx » 05 Aug 2018, 18:51

It's an HP programming keyboard. Haata has a photo album of a similar model and you can also purchase your own on eBay.

https://www.flickr.com/photos/triplehaa ... 193777563/
https://picclick.com/VINTAGE-HP-5375A-P ... 93551.html

mcmaxmcmc

Unread post by mcmaxmcmc » 06 Aug 2018, 08:23

A mousetrap switch keyboard :O

How do those feel/sound? "Typing" demonstration, please!

xxhellfirexx

Unread post by xxhellfirexx » 06 Aug 2018, 11:45

[quote="mcmaxmcmc" post_id=421065]A mousetrap switch keyboard :O

How do those feel/sound? "Typing" demonstration, please![/quote]


https://m.youtube.com/watch?v=TCDi-UXUo8E#

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