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 charac-
ters 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.