INT 10 - VIDEO - Compaq Extensions - TURN ON REVERSE VIDEO                      
	AX = BF09h
Return: CF clear
Notes:	sets bit 6 of port 03CEh index 81h; in some cases also sets index 84h
	  to 6Fh and index 83h to 04h
	supported by at least the QVision board and the LTE Lite ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly.
SeeAlso: AX=BF0Ah,AX=BF0Bh