.th DP IV 5/31/77 .sh NAME dp \*- DP-11, DU-11 synchronous line interface .sh DESCRIPTION The .it dp0 file is a data-set interface. .it Read and .it write calls to dp0 are unlimited, but this works best when restricted to less than 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 characters 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. An error is returned if data-set ready is not present. .sh FILES /dev/dp0 .sh "SEE ALSO" dn(IV)