A simple operating system or say, just a simple boot loader

os.asm

;Code from http://mikeos.berlios.de/write-your-own-os.html
;See my cool solution to boot this 'OS‘,i think it's much cool. 
; http://haiyangxu.github.io/posts/2014/2014-05-21-write_a_bootloader

	BITS 16

start:
	mov ax, 07C0h		; Set up 4K stack space after this bootloader
	add ax, 288		    ; (4096 + 512) / 16 bytes per paragraph
	mov ss, ax
	mov sp, 4096

	mov ax, 07C0h		; Set data segment to where we're loaded
	mov ds, ax


	mov si, text_string	; Put string position into SI
	call print_string	; Call our string-printing routine

	jmp $			    ; Jump here - infinite loop!


	text_string db 'This is my cool new OS!', 0


print_string:			; Routine: output string in SI to screen
	mov ah, 0Eh		; int 10h 'print char' function

.repeat:
	lodsb			; Get character from string
	cmp al, 0
	je .done		; If char is zero, end of string
	int 10h			; Otherwise, print it
	jmp .repeat

.done:
	ret


	times 510-($-$$) db 0	; Pad remainder of boot sector with 0s
	dw 0xAA55		        ; The standard PC boot signature