Tape Storage for Dummies

From: CLASSICCMP_at_timaxp.trailing-edge.com <(CLASSICCMP_at_timaxp.trailing-edge.com)>
Date: Sun Sep 13 21:31:33 1998

>A tape from a PDP-11 would ahve to be mounted foreign as it's a non
>files-11 format.
>Allison

Gees, Allison, I've been interchanging tapes between VMS and RT-11 and RSX-11
for years and I don't have to mount them foreign :-).

You will very likely want to review section 1.2.2 in your "RT-11
Volume and File Formats Manual" to get the straight dope RT-11 <-> VMS
file interchange. In particular, it notes how RT-11 uses
80-byte HDR1 records now. If anybody *really* wants to get into
minutae, we can begin a discussion about whether ANSI Standard X3.27-1978
requires that headers be exactly 80 bytes or whether it just sets forth
the interpretation of the first 80 bytes. I don't have a copy of the
level 4 standard with me at the moment, but I don't think this makes
it any clearer. In any event, the level-4 compliant versions of RT-11's
FSM handlers in RT-11 V5.7 only write 80 byte headers, so it's now a
moot point.

And tell any RSX devotee that his magtapes must be mounted /FOREIGN
on a VAX and he'll teach you about something called an ACP :-).

-- 
 Tim Shoppa                        Email: shoppa_at_trailing-edge.com
 Trailing Edge Technology          Voice: 301-767-5917
 7328 Bradley Blvd                 Fax:   301-767-5927
 Bethesda, MD, USA 20817
Received on Sun Sep 13 1998 - 21:31:33 BST

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