ok - Ta ... filling in the gaps Red wine created ... ooh .. speaking of which ..



> > ... that doesn't pick up the carry does it?  (my asm is feeling very rusty).
> That would be a rotate.  Unsigned shifts stick a zero in the empty spot. 
>   Signed shift right will fill the msb with the previous sign bit. 
> Rotates fill the empty spot with the carry bit.
> 


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