This has been tried on machines that had a writable control store, mostly in the 70's -- the Wikipedia page mentions a few of them. https://en.m.wikipedia.org/

This has been tried on machines that had a writable control store, mostly in the 70's -- the Wikipedia page mentions a few of them. https://en.m.wikipedia.org/wiki/Control_store https://en.m.wikipedia.org/wiki/Control_store