This feeder advancer scheme was a first crude effort at best.
it uses M64 and M65 as the codes to trigger the feeder events.
It utilizes Classic ladder to control timers for when to turn 
ON and/or OFF the shift racks and the feeder plungers. In short I wouldn't
recommend doing it this way because a lot of forethought has 
to go into the G-code itself to make the feeders actuate properly.  
That said I am still posting it for historical curiosity.

  If you look through the .hal file you will notice it using
a Mesa 5i25 to 7i71 board. Which was what I was using at the time
I am now using a 7i76E and 7i71 board to actuate the feeders.

  The .clp file is in a .txt format . To load it simply remove 
the .txt from the file name and leave the .clp so that it 
will load properly.