finish day 1

day_01/helloos.asm

@@ -0,0 +1,25 @@
+; Hello World Program in 16-bit Assembly
+; This code is intended to run on a DOS system.
+
+.model small
+.stack 100h
+
+.data
+helloMessage db 'Hello, World!$'
+
+.code
+start:
+    ; Initialize the data segment
+    mov ax, @data
+    mov ds, ax
+
+    ; Display the message
+    mov ah, 09h ; AH = 09h for displaying a string in DOS
+    lea dx, helloMessage ; Load the address of the message into DX
+    int 21h ; Call DOS interrupt
+
+    ; Terminate the program
+    mov ax, 4C00h ; Terminate program
+    int 21h
+
+end start