INT 16,2 - Read Keyboard Flags

	AH = 02


	on return:
	AL = BIOS keyboard flags (located in BIOS Data Area 40:17)

		│7│6│5│4│3│2│1│0│  AL or BIOS Data Area 40:17
		 │ │ │ │ │ │ │ └──── right shift key depressed
		 │ │ │ │ │ │ └───── left shift key depressed
		 │ │ │ │ │ └────── CTRL key depressed
		 │ │ │ │ └─────── ALT key depressed
		 │ │ │ └──────── scroll-lock is active
		 │ │ └───────── num-lock is active
		 │ └────────── caps-lock is active
		 └─────────── insert is active