Question: I just need a hello world demo to see how machine code actually works.

Though windows' **EXE** and linux' **ELF** is near machine code,but it's not **PURE**

How can I write/execute **PURE** machine code?

Answer: 
You **can** write in PURE machine code manually **WITHOUT ASSEMBLY**

Linux/ELF: <https://github.com/XlogicX/m2elf>. This is still a work in progress, I just started working on this yesterday.

Source file for "Hello World" would look like this:

```
b8    21 0a 00 00   #moving "!\n" into eax
a3    0c 10 00 06   #moving eax into first memory location
b8    6f 72 6c 64   #moving "orld" into eax
a3    08 10 00 06   #moving eax into next memory location
b8    6f 2c 20 57   #moving "o, W" into eax
a3    04 10 00 06   #moving eax into next memory location
b8    48 65 6c 6c   #moving "Hell" into eax
a3    00 10 00 06   #moving eax into next memory location
b9    00 10 00 06   #moving pointer to start of memory location into ecx
ba    10 00 00 00   #moving string size into edx
bb    01 00 00 00   #moving "stdout" number to ebx
b8    04 00 00 00   #moving "print out" syscall number to eax
cd    80            #calling the linux kernel to execute our print to stdout
b8    01 00 00 00   #moving "sys_exit" call number to eax
cd    80            #executing it via linux sys_call

```

WIN/MZ/PE:

shellcode2exe.py (takes asciihex shellcode and creates a legit MZ PE exe file) script location:

<https://web.archive.org/web/20140725045200/http://zeltser.com/reverse-malware/shellcode2exe.py.txt>

dependency:

<https://github.com/radare/toys/tree/master/InlineEgg>

extract

```
python setup.py build

sudo python setup.py install

```
The next program is an Hello World program I wrote in Machine Code 16 bit (intel 8086), If you want to know machine code, I suggest that you learn Assembly first, because every line of code in Assembly is converted to A code line in Machine Code. For well I know I am from the few people in the world, still programming in Machine Code, instead of Assembly.

BTW, To run it, save the file with a ".com" extension and run on DOSBOX!

[So, this is an Hello World Program.](https://i.stack.imgur.com/a9m59.png)