In high school, most kids use TI-82 or TI-83 calculators. We didn't. We were cool, and used HP48s. These calculators used reverse polish notation (RPL), or postfix, which means they process arithmatic operations with the operators following the operands, eg. 345*+ = 23. These calculators had their own graphics editors, and the resolution of the screen was an indecipherable 131x64. That's right -- one hundred thirty one pixels by sixty four, for a bilevel (greyscale with some nifty software hacks) pixel count of 8384.