INT 62 u - FGDRIVER v4.02 - "FG_YVIEW" - TRANSLATE VERTICAL VIEWPORT COORDINATE
	AX = 00E6h
	BX = viewport Y coordinate
Return: AX = screen space row for viewport coordinate
Program: FGDRIVER is the external video driver for the shareware
	  Fastgraph/Light by Ted Gruber Software
Notes:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
	if no viewport has been defined, the returned coordinate will be the
	  same as the viewport coordinate
SeeAlso: AX=00E3h,AX=00E5h