According to ESR: "Seymour Cray, designer of the Cray line of supercomputers, was among the greatest. He is said once to have toggled an entire operating system

According to ESR: "Seymour Cray, designer of the Cray line of supercomputers, was among the greatest. He is said once to have toggled an entire operating system of his own design into a computer of his own design through its front-panel switches. In octal. Without an error. And it worked." http://catb.org/esr/writings/cathedral-bazaar/hacker-history/ http://catb.org/esr/writings/cathedral-bazaar/hacker-history...