In an old college class, they did a proof that it takes a nor or nand to generate a 'complete logic system'. Meaning you can build all the various logic functions from either of those forms. It is not possible to generate them from and or or logic. The inverter is the only thing that is needed to complete the logic system.
Logically, with an xor, you can tie one of the inputs high, and it will generate an inverted output of the other input. Effectively using an xor as an inverter. I don't know how to implement it in LinuxCNC, but the digital logic allows the option. On Thu, Aug 14, 2014 at 7:15 PM, andy pugh <[email protected]> wrote: > On 15 August 2014 01:06, Gene Heskett <[email protected]> wrote: > > > > In fact, I was wishing I had a 4 input and at one point today. > > You can use http://www.linuxcnc.org/docs/html/man/man9/logic.9.html to > create a 4-input AND OR or XOR, but not the inverted version. > > It would seem like a trivial mod to add the inverted outputs. (to be > honest I am not entirely sure why the function doesn't just supply all > outputs, all the time. > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- ><> ... Jack "Whatever you do, work at it with all your heart"... Colossians 3:23 "If you are not part of the solution, you are part of the precipitate" - Henry J. Tillman "Anyone who has never made a mistake, has never tried anything new." - Albert Einstein "You don't manage people; you manage things. You lead people." - Admiral Grace Hopper, USN "a nanosecond is the time it takes electrons to propigate 11.8 inches" - " - http://youtu.be/JEpsKnWZrJ8 "Life is complex: it has a real part and an imaginary part." - Martin Terma ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
