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Function 1Ah            Set Disk Transfer Address (DTA)

    Sets the address of the buffer that DOS uses for disk searches
    (and FCB-based file I/O).

        Entry   AH    = 1Ah
                DS:DX = Address of DTA buffer

        Return  Nothing

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    DOS supplies a default DTA of 128 bytes at offset 0080h in the
    Program Segment Prefix (PSP).

    This function is used with the "Find First" and "Find Next"
    functions (both Handle and FCB) and with FCB-based file I/O.