INT 15 - later PS/2s - READ BOOT DEVICE KEY AX = D601h BL = 00h DX = device ID Return: CF clear on success AH = 00h CF set on error AH = status (86h for function not supported) SeeAlso: AX=D600h/BL=00h,AX=D601h/BL=01h,AX=D602h