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From: 54394gt@hocda.UUCP
Newsgroups: net.unix
Subject: Raw tape buffer vs record size
Message-ID: <344@hocda.UUCP>
Date: Tue, 17-Jan-84 13:36:56 EST
Article-I.D.: hocda.344
Posted: Tue Jan 17 13:36:56 1984
Date-Received: Wed, 18-Jan-84 07:25:21 EST
Organization: Bell Labs, Holmdel
Lines: 4

On our systems on a PDP-11/45 (USG 2.0, then later 4.2), a raw tape read (TU10)
always returns the number of bytes on the tape record if that is less than
or equal to the buffer size.  It never overruns the buffer.  I have tried
all combinations of record size and buffer size.  Both must be even.