Thanks for the correction. I always forget inversion
is the key. Any good tips in remembering such critical
stuff for digital electronics.

Thanks
John


--- John La Rooy <piclist.jlr@larooy.com> wrote:

>   Correct me if I am wrong but basic NOT AND and XOR
> 
> > can building all sort of gates which ultimately
> can
> > build comparators.
> 
> 
> Inversion is the key. NAND and NOR gates can be
> combined to
> make AND and OR gates, but there is no way to
> construct NAND
> or NOR gates from only AND and OR :)
> -- 
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