DP (IV) 3/15/72 DP (IV)





DP (IV)                      3/15/72                      DP (IV)





NAME            dp -- dp-11 201 data-phone interface



DESCRIPTION     dp? is a 201 data-phone interface file.  read and

                write calls to dp? are limited to a maximum of

                400 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 20 second time out is set and a zero byte

                record is returned if nothing is received in that

                time.



FILES           /dev/dp0        201 dataphone used to call GCOS



SEE ALSO        dn(IV), gerts(III)



BUGS            The dp file is GCOS oriented.  It should be more

                flexible.
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