It may be possible to wire the RPi GPIO directly to the touch pad connection and emulate the pad. Whilst this technique is likely to limit the available commnads to those of the BigTrack it'd make a good first start.
 
It may be possible to wire the RPi GPIO directly to the touch pad connection and emulate the pad. Whilst this technique is likely to limit the available commnads to those of the BigTrack it'd make a good first start.
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==== Touch Pad ====
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==== Key Pad ====
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There are 10 connections on the main board which presumably map to the rows and columns of the touch pad.
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There are 10 connections on the main board which somehow map to the rows and columns of the key pad.