📄 du.4
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.TH DU 4 .SH NAMEdu, dp \- DU-11 201 data-phone interface.SH DESCRIPTIONThe.I dp0fileis a 201 data-phone interface..I Readand.I writecallsto dp0are limited to a maximum of 512 bytes.Each write call is sent as a single record.Seven bits from each byteare written along with an eighth odd paritybit.The sync must be user supplied.Each read call returns characters received from asingle record.Seven bits are returned unaltered; the eighth bitis set if the byte was not received in odd parity.A 10 second time out is set and a zero-byterecord is returned if nothing is received in that time..SH FILES/dev/dp0.SH "SEE ALSO"dn(4).SH BUGSThe name.I dp0is a historical dreg.
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