bits 16
org 0x7c00

; main code
init:
	mov si,mesg
	call puts
	; read keyboard, once we get one print something else
	mov ah,0 ; function: read scancode (blocking)
	int 0x16 ; keyboard interrupt
	; AH = BIOS scan code ; AL = ASCII character
	; for non-blocking version (ah=1)
	; ZF set if no keystroke available ; ZF clear if keystroke available
	mov si,more
	call puts

; hang around
hang:
	jmp hang

; message
mesg:
	db 13,10,"Hello UniMAP! ... again!",13,10,0
more:
	db 13,10,"Got you!",13,10,0

; sub-routine to print string pointed by si
puts:
	lodsb
	or al,al
	jz .done
	mov ah,0x0e ; function: display char (tty?)
	int 0x10 ; video display interrupt
	jmp puts
.done:
	ret

; filler
	times 510-($-$$) db 0

; the boot signature
	db 0x55,0xAA