What about the part where he developed a tool that automated the process of discovering hidden opcodes? If _I_ were going to make such a tool, I would use the

What about the part where he developed a tool that automated the process of discovering hidden opcodes? If _I_ were going to make such a tool, I would use the data sheet to confirm the tool did what it was supposed to. Given that he lacked the data sheet at the time he developed the tool, it still seems pretty impressive that the tool worked.