asm1: lab1

asm1/lab1/nasm.asm

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+section .data
+        s:    db 'HELLO WORLD', 10 ; 10 = '\n'
+
+section .text
+        global _start ; adding _start name to object code
+
+_start:
+        mov eax, 4 ; system call 'write'
+        mov ebx, 1 ; write to stdout
+        mov ecx, s ; string adr
+        mov edx, 12 ; string len
+        int 80h
+
+        mov eax, 1 ; system call 'exit'
+        mov ebx, 0 ; exit code
+        int 80h

asm1/lab1/tasm.asm

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+.model small ; small memory model (64 KB)
+.stack 100h ; reserve 100h bytes for stack
+.data
+    message db 'HELLO WORLD', 13, 10, '$' ; 13 = \r, 10 = \n, string must be terminated with $
+.code
+start:
+    mov ax, @data ; unable to put in ds directly 
+    mov ds, ax
+    mov dx, offset message ; offset of the message (0)
+    mov ah, 09h ; display string ds:dx
+    int 21h ; main system interrupt
+    
+    mov al, 0 ; return code 0
+    mov ah, 4Ch ; terminate with return code
+    int 21h
+end start