1 Jan
2018
1 Jan
'18
2:17 p.m.
I had that happening on mine.. came down to a bad RAM board.
Sent from my Samsung device
-------- Original message --------
From: Nick Allen via cctalk <cctalk at classiccmp.org>
Date: 2018-01-01 10:32 AM (GMT-08:00)
To: cctalk at classiccmp.org
Subject: Help diagnosing boot issue SWTPC 6800
Hey everyone, Happy New Years!? I am thankful for an active community
that enjoys helping each other learn, and today I am coming with an ask
for help.
I have a SWTPC 6800 and ADM3A terminal, I can get it to boot, and when
it boots it will continue to boot for several hours.? But getting it to
successfully boot takes upwards of 100 power OFF and ON cycles.? The
other 99 times, I get a continuous stream of random ASCII characters
(see video link below).? It's my first time seeing this type of issue
that happens intermittently, and wondering if anyone has any insights in
what might be causing this.? I suspect its a faulty IC on the Processor
board that resets or controls the OS reset, will need to deep dive and
diagnose, but thought I would ask for some direction first.
https://www.youtube.com/watch?v=Ci4vhPn-3PE
Thanks in advance!
-Nick
1 Jan
1 Jan
2:51 p.m.
You should also verify that you have solid +8V and +/- 12V on the
backplane.
In one of my SWTPC 6800 machines, I found that the white Molex connector
on the power supply filter board had degraded contacts that over time
(a long time!) where heating and actually melted some of the connector
shell, made the contacts further crappy and resulted in too much drop
in the +8V rail so that all the downstream regulators weren't happy.
I replaced the on-board connector with one on wires, repaired the toasted
PCB and now the machine runs fine again. The new connector floats in
the air a few inches above the PCB and this actually makes it easier to
plug and unplug if needed.
Chris
On Monday (01/01/2018 at 02:17PM -0800), Brad H via cctalk wrote:
I had that happening on mine.. came down to a bad RAM board.
Sent from my Samsung device
-------- Original message --------
From: Nick Allen via cctalk <cctalk at classiccmp.org>
Date: 2018-01-01 10:32 AM (GMT-08:00)
To: cctalk at classiccmp.org
Subject: Help diagnosing boot issue SWTPC 6800
Hey everyone, Happy New Years!? I am thankful for an active community
that enjoys helping each other learn, and today I am coming with an ask
for help.
I have a SWTPC 6800 and ADM3A terminal, I can get it to boot, and when
it boots it will continue to boot for several hours.? But getting it to
successfully boot takes upwards of 100 power OFF and ON cycles.? The
other 99 times, I get a continuous stream of random ASCII characters
(see video link below).? It's my first time seeing this type of issue
that happens intermittently, and wondering if anyone has any insights in
what might be causing this.? I suspect its a faulty IC on the Processor
board that resets or controls the OS reset, will need to deep dive and
diagnose, but thought I would ask for some direction first.
https://www.youtube.com/watch?v=Ci4vhPn-3PE
Thanks in advance!
-Nick
--
Chris Elmquist
2328
days inactive
2328
days old
1 comments
2 participants
participants (2)
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chrise＠pobox.com -
vintagecomputer＠bettercomputing.net