On 12/08/2016 07:08 PM, dwight wrote:
  Not meaning to throw things to far off but on my
 NC4000 machine( 16 bit ), I found ByteSwap useful enough that I had it
 hard wired.
 I have an old computer that was intended to do FFTs. It has a
 complete bit order swap, MSB to LSB, instruction.
 
Yup, this is to implement the "butterfly" mirroring of the addresses for
the FFT.
Jon