It beings back memories, I was learning CNC machining mainly on Fanuc machines. They were old, reliable, but ultimately quiete crude machines. When for the first time I was working on a modern Sinumeric milling machine, I was amazed how user-friendly it was. Instead of writing g-code by hand, user could just use a menu to choose operation to perform, like machining an island or a pocket. You could say that Fanuc felt like C, and Sinumeric like Python. Well, not 1:1, but close enough for analogy.

The article though, it's an interesting read, but I hoped for more technical details. It ends abruptly too, so I hope for a continuation.

For a second I read 0M as the number of parameters

Another problem with these old controls is even when code is sent over serial, they are slow. Think like less than 9600 baud.

They also don't have the computing power to do adaptive or other modern tool paths.