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DU(4)											    DU(4)

       du, dp - DU-11 201 data-phone interface

       The  dp0 file is a 201 data-phone interface.  Read and write calls to dp0 are limited to a
       maximum of 512 bytes.  Each write call is sent as a single record.  Seven bits  from  each
       byte  are  written  along  with an eighth odd parity bit.  The sync must be user supplied.
       Each read call returns characters received from a single record.  Seven bits are  returned
       unaltered;  the eighth bit is set if the byte was not received in odd parity.  A 10 second
       time out is set and a zero-byte record is returned if nothing is received in that time.



       The name dp0 is a historical dreg.

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