Hello everone,

To let my 16c74 communicate with my "jupiter" gps receiver in binairy
format i need to calculate a checksum. With the following mathematics



                ^16  _ 4
  SUM = MODULA 2     \  Word (i)
                     /
                     - i=1

  if sum = -32768 -> checksum = sum
  else checksum = -sum


Is there someone in who has an routine available for it in C or
assembly ?

Thanks in advance.
--------------------------------------------------------
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