Firefox.exe is a file in the file system, 80 MB in size.The instructions such that, when run, "Firefox" actions happen.The cursor blinks waiting for you to type The Firefox window appears (the first 1000 instructions) Run top to bottom (just like Javascript!) Firefox is made of millions of machine code instructions.the very popular Intel x86 family) has its own, idiosyncratic machine code which is not compatible with the machine code of other CPU families. The language of the machine code is hardwired into the design of the CPU hardware it is not something that can be changed at will. A computer can run multiple programs at the same time and is responsible for keeping their memory separate.Ī CPU understands a low level "machine code" language (also known as "native code"). The common case is a "program" like Firefox - software you run on your computer to solve a particular problem. If the hardware is a player piano, then the software is the music. "Software" is the general category of code which runs on the hardware.
print(1, 2)translates to a lot of machine instructions to actually run on the CPU Javascript does not run on the CPU directly.Javascript code we've used: print(1, 2).Each machine code instruction is extremely simple.The CPU implements "machine code" instructions.
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