> What is the difference between 2s complement, logical complement and
> complement (NOT) and any others?
> I am not so hot on the logical operations of PICs and help would be
> appreciated.  Is there a program which you enter binary numbers and a pic
> instruction sequence and you see the results calculator style?  Can you also
> reccomend any books on binary / boolean logic.
>
> Thanks
>
> Tim

Ok, you're obviously serious here so....

2s complement is a way of storing negative numbers. Invert all bits and
add one.
   So.      -1   is   0000 0001 -> 1111 1110 -> 1111 1111  (assuming 8 bit)

1s complement is the same except don't add 1.

logical complement is the same as 1s complement. i.e. invert all bits.

Not is generally boolean in operation.
ie. not (1) = 0   not (0) = 1 and not(100) = 0
although it can be confused with logical complement.
( I think in C , not is ! and complement is ^ or ~ or something.

Any help?

Conor.