[Newbies] Storing a negative SmallInterger in a ByteArray

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Hi people,

I am a bit confused...
I am working on an implementation to communicate with the Lego
Mindstorms NXT. Al works fine, except I have to store some negative
numbers in the ByteArray that should be send to the NXT. Everytime I
try, I get an improper store into indexable object.

Is it possible to store negative values in a ByteArray?

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