1DU(4) Kernel Interfaces Manual DU(4)
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6 du, dp - DU-11 201 data-phone interface
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9 The dp0 file is a 201 data-phone interface. Read and write calls to
10 dp0 are limited to a maximum of 512 bytes. Each write call is sent as
11 a single record. Seven bits from each byte are written along with an
12 eighth odd parity bit. The sync must be user supplied. Each read call
13 returns characters received from a single record. Seven bits are
14 returned unaltered; the eighth bit is set if the byte was not received
15 in odd parity. A 10 second time out is set and a zero-byte record is
16 returned if nothing is received in that time.
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19 /dev/dp0
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22 dn(4)
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25 The name dp0 is a historical dreg.
26 DU(4)