tooling:
  fceux as emulator
  nesasm as assembleur, support macro
  gradle for integration
  vim as editor

  script that convert png to nes rom
  script that assemble and run the code
  script that do test suite

memory macro:
  .code -> readonly memory for code
  .rodata -> readonly memory for constant
  .data -> memory for variable
  .bss -> uninitialised variable ...

header macro:
  .inesprg 1  -> 1 segment 16kb rom
  .ineschr 1  -> 1 segment 8kb rom for tile sprite
  .inesmap 0  -> dont use a mapper
  .inesmir 1  -> activate image mirrioring.

instruction macro:
  .org 0x12FC  ->