On 11 Jan 2008 at 6:33, [EMAIL PROTECTED] wrote:

Thanks for the information Alex, I just assumed that M66 was real time...

I still wish I had an example of it so I could see why it won't work for me...

Thanks
John

> I can't think of any possible reason why it would work with a pyvcp
> button, but not when using the parport.
> 
> 
> > Has anyone used M66 with a parport input?
> >
> > I seem to be unable to make it work with a hardware input.
> > I have made it work using a pyVCP button.
> > I'm told that it works so I must not be able to figure it out.
> >
> > What I have done so far is documented here:
> > http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Mword
> >
> > If anyone can point out where I failed that would help.
> >
> > I think that M66 would be better for plasma control than using
> > the spindle on/off as the spindle is not real time.
> 
> M66 is way further away from realtime than spindle control.
> It causes the interpreter to halt and wait for an input, and once that
> comes (checked by task which is not realtime), it starts interpreting,
> putting things back on the queue, which then get executed, etc. If for
> example the harddrive happened to spin down during the M66 wait, the
> interpreter *can* take a long time before it starts resuming..
> 
> 
> > Thanks
> > John
> 
> Regards,
> Alex



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