Keyboard Flags Bytes 0 and 1

		│7│6│5│4│3│2│1│0│  40:17  Keyboard Flags Byte 0
		 │ │ │ │ │ │ │ └──── 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

		│7│6│5│4│3│2│1│0│  40:18  Keyboard Flags Byte 1
		 │ │ │ │ │ │ │ └──── left CTRL key depressed
		 │ │ │ │ │ │ └───── left ALT key depressed
		 │ │ │ │ │ └────── system key depressed and held
		 │ │ │ │ └─────── suspend key has been toggled
		 │ │ │ └──────── scroll lock key is depressed
		 │ │ └───────── num-lock key is depressed
		 │ └────────── caps-lock key is depressed
		 └─────────── insert key is depressed

Keyboard Flags Bytes 2 and 3

		│7│6│5│4│3│2│1│0│  40:97  LED Indicator Flags
		 │ │ │ │ │ │ │ └──── scroll lock indicator
		 │ │ │ │ │ │ └───── num-lock indicator
		 │ │ │ │ │ └────── caps-lock indicator
		 │ │ │ │ └─────── circus system indicator
		 │ │ │ └──────── ACK received
		 │ │ └───────── re-send received flag
		 │ └────────── mode indicator update
		 └─────────── keyboard transmit error flag

		│7│6│5│4│3│2│1│0│  40:96  Keyboard Mode/Type
		 │ │ │ │ │ │ │ └──── last code was the E1 hidden code
		 │ │ │ │ │ │ └───── last code was the E0 hidden code
		 │ │ │ │ │ └────── right CTRL key depressed
		 │ │ │ │ └─────── right ALT key depressed
		 │ │ │ └──────── 101/102 enhanced keyboard installed
		 │ │ └───────── force num-lock if Rd ID & KBX
		 │ └────────── last char was first ID char
		 └─────────── read ID in process

	- see	INT 9  BDA