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Two's compliment?

807569Jul 11 2006 — edited Jul 11 2006

I need to implement an algorithm to calculate the value as described by the following paragraph:

"the bytes comprising fields indicated by "$$" are summed and the low-order 8 bits are then negated (2's complement) to form the CheckSum."

see http://www.radio-active.net.au/web/gps/garmin.html

I have no idea how to do this. If anyone could suggest some working code it would be appreciated very much.

Thanks

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Locked on Aug 8 2006

Added on Jul 11 2006

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