NASM program for a simple calculator
- http://cs.lmu.edu/~ray/notes/nasmtutorial/
- http://www.idryman.org/blog/2014/12/02/writing-64-bit-assembly-on-mac-os-x/
- http://www.int80h.org/bsdasm/
- https://www.nasm.us/doc/nasmdoc0.html
- https://lord.io/blog/2014/assembly-on-osx/
- http://www.posix.nl/linuxassembly/nasmdochtml/nasmdoca.html
- https://stackoverflow.com/questions/13793609/nasm-vs-gas-practical-differences