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DP(IV)                       8/24/73                       DP(IV)







NAME

     dp - dp11 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(IV), gerts(III)



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