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- Xref: sparky comp.sys.ncr:547 comp.unix.questions:14785
- Path: sparky!uunet!gatech!gatech!dcatla!holos0!lbr
- From: lbr@holos0.uucp (Len Reed)
- Newsgroups: comp.sys.ncr,comp.unix.questions
- Subject: Re: NCR Unix to SCO Unix Tar incompatability question
- Message-ID: <1992Dec17.140829.15451@holos0.uucp>
- Date: 17 Dec 92 14:08:29 GMT
- References: <1992Dec15.035339.24343@jpradley.jpr.com> <1992Dec15.182031.16597@unislc.uucp>
- Organization: Holos Software, Inc.
- Lines: 30
-
- In article <1992Dec15.182031.16597@unislc.uucp> dold@unislc.uucp (Clarence Dold) writes:
- >From article <1992Dec15.035339.24343@jpradley.jpr.com>, by jpr@jpradley.jpr.com (Jean-Pierre Radley):
- >
- >> Am I in error to state that the NCR is running a big-endian architecture, whi
- >> the SCO machine is on a little-endian chip?
- >> So your bytes are swapped..
- >
- >Oddly enough, perhaps not. The machine architecture has nothing to do
- >with the endien in the tape driver.
- >When Convergent was building both Intel and Motorola boxes, they both ran
- >the same interchangeable tape format.
- >While Unisys was selling all three (Convergent Intel, Convergent Motorola,
- >and NCR Motorola), byte swap was needed to go to the NCR box.
- >I don't know about the newer NCR-Intel boxes. I suspect that they would be
- >compatible with the old.
- >The current Unisys machines play interchangeably with IBM/RS6000, as well as
- >SCO UNIX boxes, and Sun.
-
- Incredibly, the Tower series tape drives were not consistent. Earlier
- Towers that used DC-600 style 60 MB cartridges wrote in a format that
- was byte-swapped from what SCO used. Later Towers that used DC-6150
- cartridges (150 MB) were compatible with SCO. The 3000 series is
- compatible with SCO. The later systems can read the 60 MB cartridges,
- but the bytes have to be reversed. Pipe through dd, using the
- command "conv=swab". This works in both directions, however, note
- that 150 MB drives generally can only read--not write--60 MB format.
-
- To list your tape:
-
- dd if=raw_tape_device conv=swab | tar tvf -
-