INT 7A - Novell NetWare - SPX Driver - INSTALLATION CHECK
        BX = 0010h
        AL = 00h
Return: AL = FFh if SPX loaded
            BH = SPX major version
            BL = SPX minor version
            CX = maximum SPX connections
            DX = SPX connections available
Note:   this function is supported by Advanced NetWare 2.1+
        this interrupt is used for IPX/SPX access in NetWare versions through
          2.0a; in later versions, you should use INT 2F/AX=7A00h to get an
          entry point even though INT 7A still exists.  For both INT 7A and
          the FAR entry point, BX contains the function number; IPX is
          sometimes called internally with BX bit 15 set.
SeeAlso: BX=0015h

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