We have a 1997 Hartford VMC 850 with a Meldas 520 controller. No books or manuals. How or where would I look to determine what the block look ahead is? Reason for asking is because we are looking at a new machine which only has 40 block look ahead. Being so old I can't imagine the Meldas has a big block look ahead like modern machines, but if the new machine with 40 is less than the old Hartford / Meldas, then it's probably going to struggle with the surface milling we do a fair bit of. The Meldas does the job for what we use it for, and we run it with Autodesk Inventor Professional and Fusion 360 CAM programs.