An old calculator uses a seven-segment display, in which numerals are represented by different patterns of vertical and ...

These are the same type of bulbs you’ll find in old indicators ... a real seven-segment display, a plus or minus sign, and an equals sign. It’s the beginnings of a calculator, right there.

Needing a project to keep him occupied, he decided to upgrade his 90s Casio CFX-9850G calculator to run custom ... to squeeze more characters onto the display than normal. [George] ended up ...