Function 1Ch    Save/Restore Video State                     (VGA) 

entry   AH      1Ch 

	AL      00h     return state buffer size 

		01h     save video state 

			ES:BX   buffer address 

		02h     restore video state 

			ES:BX   buffer address of previously saved state 

	CX      requested states 

		bit  0      video hardware 

		     1      BIOS data areas 

		     2      color registers and DAC state 

		     3-15   reserved 

return  AL      1Ch if function supported 

	BX      number of 64 byte blocks needed (function 00h) 

note    VGA only