Texas Calculators
| Launch | 1972 |
| Launch | 9999 |
“As well as the cheap laughs you can get by typing 53188008 in a calculator and turning it upside down, many calculators also have the ability to be programmed.
As a result this has led to many games being unofficially ported to them, including the likes of Tetris, Flappy Bird, and even a version of Doom.”