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Is this an external number pad port?

P

pcm2a

Experienced Member
Joined
Jun 24, 2013
Messages
190
Anyone got a picture of one that plugs into that headphones looking port?
 

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It would help a lot if you would at least identify the machine that you have taken the picture of.
 
Lol makes sense! It's a Compaq LTE elite 4/50cx laptop.
 
NeXT said:
I've also always wondered why on earth they used a headphone jack for the numpad.
Click to expand...

It is small, the parts are easy and cheap to get, and the data stream is serial in nature so it doesn't require multiple pins?
 
NeXT said:
I've also always wondered why on earth they used a headphone jack for the numpad.
Click to expand...
Why not? Makes a lot of sense, considering the limited space for connectors on a laptop.

Actually, I was wondering why he needs a picture or why he's asking since there's a picture beside the jack.
 
I'm sort of curious as to what the protocol is with only 3 conductors available. (tip, ring, sleeve). Async serial over one line with the other two supplying power?
 
+5,Serial,GND could be possible.
Could potentially just a measurement wire, with only a few keys using capacitance or resistance you could work out what was going on with only two wires. A third could be used if you wanted a num lock light. I don't have any, so can't look :S no idea what the standards were for those.
 
Just making sure. I've looked on ebay for one but so far haven't found a picture yet.
 
Yep, That's recycledgoods.com. High prices and way overpriced shipping!!

Of course, you could make him an offer, but he will reject or ignore it.
 
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I find that with the high quantity sellers you don't even get responses to messages most of the time :-(
 
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