INT 62 u - FGDRIVER v4.02 - "FG_FREEPAGE" - FREE VIRTUAL OR LOGICAL VIDEO PAGE
	AX = 0038h
	BX = page number (0000h-003Fh)
Return: AX = status (0000h,0001h,0007h,0009h) (see #03473)
Note:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
SeeAlso: AX=0000h,AX=0001h,AX=0002h,AX=0003h