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Re: Reconstructing an AT&T 7300

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On 2015-06-17, vlaarom@gmail.com <vlaarom@gmail.com> wrote:
> On Wednesday, June 17, 2015 at 4:45:07 AM UTC+3, DoN. Nichols wrote:

	[ ... ]

>> 	So -- the marching squares usually come from the inability to
>> find a boot image on either the hard disk or the floppy.  Are you trying
>> to boot from the hard drive?  If it was in there while the system was
>> getting very glitchy power, as evidenced by the relays, it is almost
>> certainly not bootable now, and will need to be reformatted and
>> reinstalled.
>> 
>> 	Do you have the floppy set for installing the OS?  There is the
>> basic set, and the development set as an extra-cost option, which gives
>> you things like compilers, a somewhat better default editor (vi/ex
>> instead of ed) and a number of other things.  There is a floppy set in
>> the original set which handles encryption, and happens to include a
>> version of vi/ex which includes encryption.  It first checks for the
>> presence of an installed vi, and updates that if so -- otherwise it
>> skips it.  This means that if you want the updated vi/ex, you must
>> install the development set before installing the encryption set.  (The
>> encryption was separate, because it could not be exported back then. :-)

> I don't have a floppy set. There are images
> here(http://bitsavers.trailing-edge.com/bits/ATT/unixPC/). Can i use it?

	Yes -- with some way to get the data onto the floppies.

	IIRC, there is a program on there to properly format and copy to
floppies in a PC -- though I'm not sure how old a PC it may have to be.

> if so can i attach floppy disk from at&t to old PC?

	IIRC, that drive had weird jumpering, and it would probably not
work.  I remember making some 3.5" drives work, doubling the capacity of
a single floppy -- but not all the way to the 1.4 MB of a HD floppy.

> Can i use dd to put *.IMD file to floppy?

	I don't think so.  Those require the speical programs which
should be there -- imd117.zip or imd117sc.zip.

	Here is part of the "README.TXT" file which accompanies the
images:


 ======================================================================
ImageDisk
---------
ImageDisk is a program to read entire diskette images into files (type .IMD),
and to recreate a copy of the diskette from that image. A detailed analysis
is performed on the diskette, and information about the formatting is recorded
in the image file. This allows ImageDisk to work with virtually any soft-
sectored diskette format that is compatible with the PC's type 765 floppy
diskette controller and drives.
 ======================================================================

one of the zip files ha a number of .Com and .Exe files, and the other a
number of .C source files.  I forget whether the .C files compile on a
PC or a linux/unix box.

	And looking at the head of a typical .IMD file, I doubt that it
could be copied directly onto a floppy.  Though perhaps dd could be used
to skip just enough of the first part, if the rest is a true floppy
image.  I just don't know.  Best to find an old PC with a 5.25" floppy
drive.

	Good Luck,
		DoN.

-- 
                  Remove oil spill source from e-mail
Email: <BPdnicholsBP@d-and-d.com> | (KV4PH) Voice (all times): (703) 938-4564
   (too) near Washington D.C.     | http://www.d-and-d.com/dnichols/DoN.html
           --- Black Holes are where God is dividing by zero ---

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Reconstructing an AT&T 7300 vlaarom@gmail.com - 2015-06-11 05:38 -0700
  Re: Reconstructing an AT&T 7300 "DoN. Nichols" <BPdnicholsBP@d-and-d.com> - 2015-06-12 00:13 +0000
    Re: Reconstructing an AT&T 7300 vlaarom@gmail.com - 2015-06-15 11:01 -0700
      Re: Reconstructing an AT&T 7300 "DoN. Nichols" <BPdnicholsBP@d-and-d.com> - 2015-06-17 01:43 +0000
        Re: Reconstructing an AT&T 7300 vlaarom@gmail.com - 2015-06-17 00:18 -0700
          Re: Reconstructing an AT&T 7300 "DoN. Nichols" <BPdnicholsBP@d-and-d.com> - 2015-06-18 03:42 +0000
            Re: Reconstructing an AT&T 7300 vlaarom@gmail.com - 2015-06-25 01:44 -0700
              Re: Reconstructing an AT&T 7300 "DoN. Nichols" <BPdnicholsBP@d-and-d.com> - 2015-06-26 02:23 +0000
  Re: Reconstructing an AT&T 7300 Convergent MightyFrame <mightyframect@gmail.com> - 2015-06-13 11:46 -0700
    Re: Reconstructing an AT&T 7300 vlaarom@gmail.com - 2015-06-15 11:01 -0700
  Re: Reconstructing an AT&T 7300 vlaarom@gmail.com - 2015-07-07 01:24 -0700
    Re: Reconstructing an AT&T 7300 "DoN. Nichols" <BPdnicholsBP@d-and-d.com> - 2015-07-12 01:06 +0000
      Re: Reconstructing an AT&T 7300 vlaarom@gmail.com - 2015-07-15 07:46 -0700
        Re: Reconstructing an AT&T 7300 "DoN. Nichols" <BPdnicholsBP@d-and-d.com> - 2015-07-18 03:53 +0000
  Re: Reconstructing an AT&T 7300 vlaarom@gmail.com - 2015-08-04 04:36 -0700
    Re: Reconstructing an AT&T 7300 "DoN. Nichols" <BPdnicholsBP@d-and-d.com> - 2015-08-09 02:11 +0000
      Re: Reconstructing an AT&T 7300 "vla...@gmail.com" <vlaarom@gmail.com> - 2021-12-13 14:00 -0800

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