With my current head of line source, I get an 'intermediate result'. You
cannot give the commands in the order specified - attaching prevents
changes in format. However, if you do the corrected order - enable/set
format/attach - then the attach succeeds, without the "read only"
message. Checking internally, the 'object count' routine finds 1900+
"objects" (records and metadata markers), and then the "construct map"
routine works as expected.
I don't know what changes were made in the attach routine in sim_tape.c
between 3.9x and 4.0, but that's where the problems lies.
/Bob
On 1/2/2016 2:43 PM, [email protected] wrote:
Message: 1
Date: Sat, 2 Jan 2016 12:43:22 -0600
From: Will Senn <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [Simh] Corrupt BASIC-PLUS 2.7 tpc issue in SimH > 3.9
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
The latest incarnation of SimH does not appear to allow the mounting of
corrupted tpc images, or at least not the one referred to here. I am
working with RSX11M-Plus v4.6 using instructions located here:
http://pdp2011.sytse.net/wordpress/pdp-11/sessions/rsx-11m-plus/
The instructions for adding BP2 to RSX11M-Plus includes mounting and
using files from a known partially corrupt tpc image loacted at:
ftp://ftp.trailing-edge.com/pub/rsxdists/basic_plus_2_rsx_v2_7.zip
There are some important files on the tape. But the tape mount does not
succeed in the latest SimH:
sim> *set ts ena*
sim> *att ts0 basic_plus_2_rsx_v2_7.tpc*
sim> *set ts0 format=tpc*
**
In the latest SimH, when you perform these instructions, the tape image
is loaded as SimH format and the set ts0 format=tpc line errors out with
'Unit already attached'. Reordering logically using:
sim> set ts ena
sim> set ts0 format=tpc
sim> att ts0 basic_plus_2_rsx_v2_7.tpc
SimH replies with:
TS: unit is read only
Format error
However, in 3.9, the instructions work exactly as described in the first
set of instruction and the files (that are
not corrupted) are then accessible in RSX11M-Plus.
As a workaround, I'm using SimH 3.9 to perform the sysgen, etc. and will
then use SimH latest because of its slew of improvements.
Does this sound like expected behavior or like an issue with the post
3.9 SimH? If so, I'll gladly open an issue, but it's weird enough, that
I thought I would ask first.
Thanks,
Will
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