[time-nuts] HP 5335A and HP-IB (GP-IB)

[Chuck Harris]

You can't copyright an instruction set.  Any patent protection NI may
have had would have expired long ago.  There is nothing preventing anyone
that is willing to go to the development effort from making a NI clone, and
several companies existed doing just that.

-Chuck Harris

J. Forster wrote:
> Does anybody know if the NI instruction set is copyright? Otherwise, I can
> see no good reason for all controllers not being interchangable.
>
> -John
>