Aucbvax.4762
fa.unix-wizards
utzoo!decvax!ucbvax!unix-wizards
Wed Oct 28 17:23:16 1981
VAX/VMS Magnetic Tape Labels
>From menlo70!sytek!rob@Berkeley Wed Oct 28 14:36:16 1981
Another source to consider for VAX/VMS or any other DEC Magnetic Tape
Label is the following:
"DEC Magnetic Tape Labels and File Structure Standard"
By, Lois Framptom, July, 1978, #005-003-187-11.
I am not sure of DEC availability. This document defines 4 levels of
magnetic tape label formats, record formats and tape-mark relationships.
It seems that DEC wanted to conform (or try) to ANSI X3.27-1977, Magnetic
Tape Labels and File Structure for Information Interchange.
This document attempts to set the DEC standard for RSX/IAS, RT-11,
RSTS/E, VMS/RMS, TOPS-10 and TOPS-20 DEC systems. I have only worked with
RSX-11/M (PIP tapes) and VMS (Ver. 1.6, 2.0 & 2.1) RMS tapes. The RSX
tapes follow the standard and are not to hard to read. VMS tapes on the
other hand are not even fully interchangeable between the above versions.
This stems from the their handling of the HDR2 record CP16-36 System
dependent file attributes field. They went from binary encoding to ASCII
one time and another they added a HDR3 record (surprise). The nastiest
field to figure out is the number of characters in the "fixed area" within
fixed-length records format. Some files will it have and others will not
even in the same VOL1 grouping.
Rob Cardoza (ucbvax!menlo70!sytek!rob)
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