INT 15,85 - System Request Key Pressed

	AH = 85h
	AL = 00 key pressed
	   = 01 key released


	on return:
	CF = 0 if successful
	   = 1 if error
	AH = 80h for PC or PCjr
	   = 86h for XT (BIOS after 11/8/82)


	- called by BIOS when the System Request key is pressed/released
	- available on machines with newer BIOS and keyboards