[BITS 16]
[ORG 0]
 
jmp start
 
	bootdrv 	db 0
	bootmsg 	db 'Boot Sector Example',13,10,0
 
	rebootmsg    db 'Press any key to reboot',13,10,0
 
	processormsg	db 'Checking for 386+ processor: ',0
	need386 	db 'Sorry... 386+ required!',13,10,0
	found386	db 'Found!',13,10,0
 
	whatever	db 'Now we insert our code here to do something, and we have an OS!',13,10,0
 
	detect_cpu:
		mov si, processormsg
		call message
 
		pushf
 
		xor ah,ah
		push ax
		popf
 
		pushf
		pop ax	     
		and ah,0f0h
		cmp ah,0f0h
		je no386
 
		; check for a 286 (bits 12-15 are clear)
		mov ah,0f0h
		push ax
		popf
 
		pushf
		pop ax
		and ah,0f0h
		jz no386
		popf
 
		mov si, found386
		call message
 
		ret
	 no386:
		mov si,need386
		call message
		jmp reboot
 
	message:
		lodsb
		or al,al
		jz done
		mov ah,0eh
		mov bx,0007
		int 0x10
		jmp message
	done:
		ret
 
	getkey:
		mov ah, 0
		int 016h
		ret
 
	reboot:
		mov si, rebootmsg
		call message
		call getkey
 
		db 0EAh
 
		dw 0000h
		dw 0FFFFh
 
start:
	mov ax,0x7c0
	mov ds,ax
data
 
	mov [bootdrv], dl
 
	cli
	mov ax,0x9000
	mov ss,ax
	mov sp,0xffff
	sti
 
	mov si,bootmsg
	call message
 
	call detect_cpu
 
.386
 
	mov si,whatever
	call message
	call getkey
 
	call reboot
 
	times 510-($-$$) db 0
	dw 0xAA55