A JavaScript calculator built around the Rhino framework and using Swing graphics.
See this link for more information: http://flatassembler.github.io/calculator.html
The file "compiler.html" contains the not-minified JavaScript of the file "compiler.js".
The file "IEEE.EXE" is a DOS program that uses DosBox specific behaviour to convert decimal numbers to IEEE-754 binary. Maybe it comes useful to somebody.
This calculator is capable of converting arithmetic expressions to Assembly. This video shows an example of how it can be used: https://youtu.be/6LZSy1IWi7I