Comment by abe_m

I used to have some machines with Fanuc 6 controllers circa 1981 - 1983. They had variables, macros, branching, etc. I haven't been able to find what processors were in those old controllers, but I'm certain the single board computers of the last decade have more ram, more flash, and way more processing power. If GRBL can't do it, it is a software issue, not hardware.