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Re: Reconstructing an AT&T 7300

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On 2015-06-15, vlaarom@gmail.com <vlaarom@gmail.com> wrote:
> On Friday, June 12, 2015 at 3:14:55 AM UTC+3, DoN. Nichols wrote:
>> On 2015-06-11, vlaarom@gmail.com <vlaarom@gmail.com> wrote:
>> > Hello All,
>> 
>> > I've found an at&t 7300 and disconnected floppy, hdd and display. When
>> > I power it up relays in modem are going crazy.
>> >
>> > Why  the relays are going crazy?
>> 
>> 	Well ... it is most likely the connector on the power supply.
>> You already have it apart, if you have all of those disconnected, so you
>> can look easily.

	[ ... ]

>> 	Of course, it could be something else, but this is what I would
>> check first.

	[ ... ]

> Thank you.
> I've replaced power supply with a pc atx power supply. Relays are normal now.

	O.K.  So likely the power supply connector and/or pins. (Did you
bother to look at the underside of the power supply for melted away
solder around the pins?  Also look for "cold solder" joints -- the
solder looks frosted instead of shiny.  If you see that, remove as much
solder as you can from that junction and then flow fresh 63/37 lead-tin
solder to get a clean smooth joint.

> I'm trying to boot at&t, but i see only running green rectangles. All 4 leds are on.
> Lithium battery is dead.
>
> I will try to replace battery. I think it will solve boot problem.

	The only difference that will make will be that if you manage to
get it to boot twice, it will remember the date from the first boot.
That cell does *nothing* else than run the clock chip.

	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. :-)

	Good Luck,
		DoN.

-- 
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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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