convert decimal numbers to excess-127 representations

Assuming you are referring to Offset binary: https://en.wikipedia.org/wiki/Offset_binary, of which the most famous example would be Excess-3: https://en.wikipedia.org/wiki/Excess-3, then the solution would be:

  • a) 77 + 127 mod 256 = 204 mod 256 = 204 = 11001100
  • b) -42 + 127 mod 256 = 85 mod 256 = 85 = 01010101

etc…

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