Similarly for making a basic CPU that implements the logic you’re describing. In 2006 or so I made a super simple microcontroller on an FPGA for a course project. It had a whopping 256 bytes of RAM, 1kB of ROM, and I think four 8-bit registers plus a 16-bit program counter. You could only jump +/- 256 bytes. It was largely useless but also incredibly satisfying.