INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - SET ??? FLAGS
        AX = 6284h
        BX = 0003h
        CX = flags
            bit 12: disable DATAMON/DPROTECT
            bit 10: ???
            bit  5: ???
            bit  3: ???
        DX = flags
            bit 15: ???
Note:   v9 DPROTECT only checks bit 12 of CX, and ignores DX entirely

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