Why 72 columns, Why three branch if, Plus and Minus Zero, The answers are in the IBM 709, 7090, 7094 machine instructions and architecture.
Eligibility
About you
Old Guy, but still relevant. Hired by Google at 65+ to work in computer security and platform hardware. "System Software" in Tracy Kidder's _The Soul of a New Machine_. 20+ software and hardware patents. My code currently lives in most of the software delivered by Microsoft, and Adobe
