Scientific Operations



DP(IV)                       8/24/73                       DP(IV)



NAME
     dp - DP-11 201 data-phone interface

DESCRIPTION
     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 charac-
     ters received from a single record.  Seven bits are returned
     unaltered;  the  eighth  bit  is set if the byte was not re-
     ceived in odd parity.  A 10 second time out is set and a ze-
     ro-byte  record  is  returned if nothing is received in that
     time.

FILES
     /dev/dp0

SEE ALSO
     dn(IV), gerts(III)

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