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        DOS Internal - Set default drive ???

        Entry:
          AX = 1217h
          STACK: WORD drive (0 = A:, 1 = B:, etc)
        Return:
          CF set on error
            (drive > LASTDRIVE)
          CF clear if successful
            DS:SI -> drive data block for specified drive
            Stack unchanged

        Note: can be called only from within DOS

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