2's complement

Hi to all
where I'm wrong?

This is the code correct in Basic4ppc that work

Code:

  str = Chr(Main.btw.Complement(serbuff(y+i)) + 256)  

Where btw is Bitwise library

This in B4j, but not work

Code:

  str = Chr(Bit.Not(serbuff(y+i)) + 256)  

I have add 1 to Bit.Not(serbuff(y+i) ?
Thanks

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