du man page on UNIXv7

du man page on UNIXv7

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DU(4)									 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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