Is the software in the controller of laser marking machine written in C language? How come some people say it's written in C++? Is its chip MCS-5 1 series single chip microcomputer?

I don't know, do you mean the marking software or the whole system control part of the equipment? Marking software is provided by professional book suppliers, who design hardware and corresponding software. The chips used in hardware are generally programmable logic devices with strong processing ability, such as FPGA and CPLD, and the software is written in C++. For some marking equipment manufacturers, they are additionally equipped with 5 1 series single chip microcomputer to improve the operation and control performance of the whole machine.