Casio CM-100 computer math calculator, circa 1984. It has sat beside my keyboard as I learned BASIC on a Commodore 64... and earned a BS in CS on a NeXT worksta

Casio CM-100 computer math calculator, circa 1984. It has sat beside my keyboard as I learned BASIC on a Commodore 64... and earned a BS in CS on a NeXT workstation... and as I wrote my doctoral dissertation... and as I wrote inverse kinematics code for a space robot.