geekhack
geekhack Marketplace => Great Finds => Topic started by: Photoelectric on Mon, 28 October 2013, 10:23:38
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http://www.ebay.com/itm/NEW-Open-box-IBM-M13-Trackpoint-Keyboard-Mechanical-Clicky-Unicomp-06H4173-PS2-/181248812004?pt=PCA_Mice_Trackballs&hash=item2a334563e4
$280 starting bid--not cheap, but apparently a rare keyboard.
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Industrial Grey case you mean?
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details!
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I was so confused for a second, I thought someone was selling a black M13 with one of the old-stock industrial covers.
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I read somewhere that the Unicomp made industrial M13's have a different pointing device that is NOT pressure sensitive, but rather actually moves a small distance. That distance determines the speed of the mouse pointer. I know we have more technical terms, but they do not come to mind at the moment.
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Ok I guess the M13 has a strain gauge, and the Unicomp has a force sensing resistor. I wonder if this industrial M13 has a force sensing resistor.
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I was so confused for a second, I thought someone was selling a black M13 with one of the old-stock industrial covers.
no, black M13's are only $125
http://www.ebay.com/itm/221306759385?
Ok I guess the M13 has a strain gauge, and the Unicomp has a force sensing resistor. I wonder if this industrial M13 has a force sensing resistor.
Most strain gauges are resistors. As you put more force on them, the resistance changes. The controller can convert this back into a force (or at least into a force difference from rest) and interpret it as input.
That said, I don't know how the unicomp ones are different from the lexmark ones.