INT 62 u - FGDRIVER v3.03 - "FG_ALLOCATE" - CREATE VIRTUAL VIDEO PAGE
        AX = 0000h
        BX = page number (0000h-003Fh)
Return: AX = status (0000h,0001h,0007h,0008h) (see below)
Program: FGDRIVER is the external video driver for the shareware
          Fastgraph/Light by Ted Gruber Software
Notes:  For FGDRIVER v1.10, this function was "FG_GETMODE" (see AX=003Fh);
          "FG_ALLOCATE" was AX=0042h
        The amount of memory required by the virtual video page depends on the
          current video mode
        The installation check consists of testing for the signature "FG" ten
          bytes beyond the start of the interrupt handler
SeeAlso: AX=0001h,AX=0002h,AX=0003h,AX=002Eh
Index:  installation check;Fastgraph/Light

Values for status:
 0000h  successful
 0001h  specified page is a physical or logical page
 0007h  virtual page created/released, but memory control blocks corrupted
 0008h  not enough memory
 0009h  attempt to free a page which was never created

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