On 2014-08-01 21:35, bSneddon wrote:
I need to calculate an error correction code for an old protocol.

I calculate the integer 4617 and want to code the 2s compliment in ASCII
hex EDF7.  When issue the following.
hex(-4617)
'-0x1209'

Does anyone know a clean way to get to the desired results?   My ECC will always
be 16 bit (4 nibble) hex number.

Use a bitwise AND:

>>> hex(-4617 & 0xFFFF)
'0xedf7'

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