INT 62 u - FGDRIVER v1.10 - "FG_ALLOCATE" - CREATE VIRTUAL VIDEO PAGE
        AX = 0042h
        BX = page number (0000h-003Fh)
Return: AX = status
            0000h successful
            0001h specified page is a physical or logical page
            0007h virtual page created, but memory control blocks corrupted
            0008h not enough memory
Notes:  FGDRIVER is the external video driver for the shareware
          Fastgraph/Light by Ted Gruber Software
        the amount of memory required by the virtual video page depends on the
          current video mode
SeeAlso: AX=009Dh,AX=009Fh