INT 62 u - FGDRIVER v4.02 - "FG_GETPIXEL" - GET COLOR OF SPECIFIED PIXEL
	AX = 004Dh
	BX = column in screen space
	CX = row in screen space
Return: AX = color value of pixel (0 to num_colors-1)
	    0000h in text modes
Note:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
SeeAlso: AX=003Ah,AX=003Dh,AX=008Fh,AX=0090h