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'[EE] IBM trackpoint modules'
2006\06\23@034015 by William Chops Westfield

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Does anyone know what the pinout of an IBM laptop "tackpoint"
(aka "force stick", aka "pointing stick") module looks like?
I came across a moderate quantity of "broken" laptop keyboards
(missing keys, etc), for which the apparent remedy is "discard
and replace")  I'd like to be able to use them ... elsewhere.
I was assuming the moderately extensive electronics would provide
a mouse-like interface, but the (flex) connector has 10 wires
(two are obviously power, so that's a start.)  10 wires is too
many for a standard mouse interface, although from some controller
chip docs I've found, they could be things like button inputs...

Thanks
Bill W

2006\06\23@044309 by Mark Rages

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On 6/23/06, William Chops Westfield <spam_OUTwestfwTakeThisOuTspammac.com> wrote:
> Does anyone know what the pinout of an IBM laptop "tackpoint"
> (aka "force stick", aka "pointing stick") module looks like?
> I came across a moderate quantity of "broken" laptop keyboards
> (missing keys, etc), for which the apparent remedy is "discard
> and replace")  I'd like to be able to use them ... elsewhere.
> I was assuming the moderately extensive electronics would provide
> a mouse-like interface, but the (flex) connector has 10 wires
> (two are obviously power, so that's a start.)  10 wires is too
> many for a standard mouse interface, although from some controller
> chip docs I've found, they could be things like button inputs...
>
> Thanks
> Bill W

General description: wwwcssrv.almaden.ibm.com/trackpoint/download.html
Circuit diagram (find the datasheet for the controller your keyboard
uses): http://www.ortodoxism.ro/datasheets/philips/TPM754A.pdf

Regards,
Mark
markrages@gmail
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