INT 10,D - Read Graphics Pixel at Coordinate

	AH = 0D
	BH = page number, see VIDEO PAGES
	CX = column number (zero based)
	DX = row number (zero based)

	on return:
	AL = color of pixel read

	- 64K IBM EGAs with BIOS dated 9/13/84 in 350 line video
	  modes,  return invalid data in AL
	- page number in BH ignored for 320x200 4 color graphics mode