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Unix Version 7 - man page for du (v7 section 4)

DU(4)				     Kernel Interfaces Manual				    DU(4)

NAME
       du, dp - DU-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 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.

FILES
       /dev/dp0

SEE ALSO
       dn(4)

BUGS
       The name dp0 is a historical dreg.

											    DU(4)


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