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From: krowitz@mit-kermit.UUCP.UUCP
Newsgroups: comp.sys.apollo
Subject: Re:  TAPES
Message-ID: <8706161547.AA24938@EDDIE.MIT.EDU>
Date: Tue, 16-Jun-87 11:25:04 EDT
Article-I.D.: EDDIE.8706161547.AA24938
Posted: Tue Jun 16 11:25:04 1987
Date-Received: Thu, 18-Jun-87 03:56:35 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
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QUIC 11 and QUIC 24 are two different standards for the physical format
of the cartridge tape (IE. bits per inch, number of tracks, recording
method, whatever). From what I've been told, some of the earlier Sun
machines can write either a QUIC 11 or a QUIC 24 format tape depending
on the setting of a switch on the controller (or perhaps the drive itself).
QUIC 24 is the format used by Apollo, the newer Suns, and the Alliant
(Apollo's DSP9000) machines. 'dd' can only help you with the data format
of the tape (IE. byte swapping, blocking factors, etc.), whereas trying
to read a QUIC 11 format tape on a QUIC 24 drive is like trying to read
an 800 BPI magtape on a 6250 BPI drive.


                                   -- David Krowitz

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