NASM

SECTION .data
msg     db "Hello, world!",0xa  
len     equ $ - msg
SECTION .text
global _start           ; the program entry point
_start:
        mov eax, 4      ; 'write' syscall
        mov ebx, 1      ; file descr. 1 (stdout)
        mov ecx, msg    ; pointer to the data
        mov edx, len    ; amount of data
        int 0x80        ; call to the kernel
        mov eax, 1      ; '_exit' syscall
        mov ebx, 0      ; zero exit code (success)
        int 0x80        ; call to the kernel

global  _start

section .text
_start:
        mov     rax, 1                  ; system call 1 is write
        mov     rdi, 1                  ; file handle 1 is stdout
        mov     rsi, message            ; address of string to output
        mov     rdx, 13                 ; number of bytes
        syscall                         ; invoke operating system to do the write

        mov     eax, 60                 ; system call 60 is exit
        xor     rdi, rdi                ; exit code 0
        syscall                         ; invoke operating system to exit
message:
        db      "Hello, World", 10      ; note the newline at the end

SECTION .text
org 0x100		; эта директива нужна только в случае .com файла, в котором нет никаких	секций
	mov ah, 0x9
	mov dx, hello
	int 0x21
	mov ax, 0x4c00		; ah == 0x4c al == 0x00
	int 0x21
SECTION .data
	hello DB "Hello, world!",0xd,0xa,'$'

%include 'WIN32N.INC'
EXTERN MessageBoxA
Import MessageBoxA user32.dll
EXTERN ExitProcess
Import ExitProcess kernel32.dll
SECTION CODE USE32 CLASS=CODE
..start:
	push UINT MB_OK
	push LPCTSTR title
	push LPCTSTR banner
	push HWND NULL
	call [MessageBoxA]
	push UINT NULL
	call [ExitProcess]
SECTION DATA USE32 CLASS=DATA
	banner db 'Hello, world!',0xD,0xA,0
	title db 'Hello',0

; Hello.asm
EXTERN MessageBoxW
EXTERN ExitProcess
SECTION .text USE64
start:
	sub rsp, 28h         ; 32 bytes for Microsoft x64 calling convention "shadow space" + 8 bytes for stack aligning to 16 bytes boundry after call put on stack 8 bytes return address
	xor rcx, rcx         ; HWND hWnd = NULL
        lea rdx, [banner]    ; LPCTSTR lpText = banner
        lea r8, [title]      ; LPCTSTR lpCaption = title
        xor r9, r9           ; UINT uType =  MB_OK
        call MessageBoxW     ; MessageBox(hWnd, lpText, lpCaption, uType)
        xor rcx, rcx         ; UINT uExitCode = 0
        call ExitProcess     ; ExitProcess(uExitCode)
SECTION .data
        banner dw __utf16__('Hello, world!'),0
        title dw __utf16__('Hello!'),0

SECTION .data
msg     db "Hello, world!",0xa  
len     equ $ - msg
SECTION .text
global _start            ; the program entry point
_start:
        push dword len
        push dword msg
        push dword 1     ; 1 is the file descriptor of stdout
        mov eax, 4       ; 4 is the 'write' syscall
        push eax         ; we must leave an extra dword on the stack
        int 0x80         ; call to the kernel
        add esp, 16      ; clean up the stack
        push dword 0     ; 0 is the exit code (success)
        mov eax, 1       ; 1 is the '_exit' syscall
        push eax         ; extra dword on the stack
        int 0x80         ; call to the kernel
                         ; no cleanup - we will never return

bits 32
     %include 'mos.inc'
     section .text
     MOS_HEADER01 main,image_end,memory_end,stacktop,0,0
main:
redraw:
       call draw_window
wait_event:
	MOS_WAITEVENT
	dec eax
	jz redraw
	dec eax
	jz key
;button pressed; we have only one button, close
	MOS_EXIT
key:
;key pressed, read it and ignore
	mov eax, MOS_SC_GETKEY
	int 0x40
	jmp wait_event
draw_window:
	MOS_STARTREDRAW
	xor eax, eax
	mov ebx, 10*65536 + 150
	mov ecx, 40*65536 + 50
	mov edx, 0x33FFFFFF
	mov edi, header
	int 0x40 ;define&draw window
	mov eax, MOS_SC_WRITETEXT
	mov ebx, 30*65536 + 10
	mov ecx, 0x80000000
	mov edx, string
	int 0x40 ;display string
	MOS_ENDREDRAW
	ret
	section	.data
header db 'HelloWorld test',0
string db 'Hello, World!',0
image_end:
	section .bss
alignb 4
stack resb 1024
stacktop:
memory_end: