The booting code and printing code

boot_code.asm

;
;A boot sector that prints the welcome message using function
;
[org 0x7c00] 		; Tells the assembler where this code will be loaded 

	mov     bx, Welcome_msg 		; bx as parameter to function
	call    str_out 		

	mov     bx, Goodbye_msg
	call    str_out
	
	hlt
	jmp 		$ - 1
	

	%include "Str_Out.asm"
	
	
	;data
	Welcome_msg:
 	db 'Welcome to the Potato Land!!',0 ; <-- 0 for the ending of routine
	Goodbye_msg:
 	db 'Matane!!',0

	;padding and magic number 
times 510-($-$$) db 0
	dw 0xaa55

Str_out.asm

;
;Printing function
;
pusha 										; push the content of register to save it properly!!
str_out: 				mov 		ah,0x0e 		;Interrupt requires 0x0e
printing: 				mov 		al, [bx] 		;load the start of string into bx
					int 		0x10 			;call Interrupt 0x10,which upon having 0x0e in ah prints the char
					add 		bx, 0x01 		;increment bx for the next character
					cmp 		al,0 			; see if its zero, if yes that means the string has ended 
					jg 		printing 		; jump on greater to prinitng
popa  										;restore the content of registers
					mov 		bx,0x00
					ret 					;finishing the fun call