Well... Finally figured it out! Found a lose solder blob shorting 2
pins on one of the motherboard ICs. That explains why I've been going
crazy trying to figure out why it's been so random and intermittent.
Thanks everyone for chiming in, and helping out!
On 1/1/2018 6:12 PM, Nick Allen wr
ctalk
Sent: Monday, January 01, 2018 6:34 PM
To: cctalk@classiccmp.org
Subject: Re: Help diagnosing boot issue SWTPC 6800
cleaning the connector pins with a brass brush solved the issue, thanks
everyone!!
On 1/1/2018 5:03 PM, Nick Allen wrote:
> Thanks for the tips everyone! I can confirm power
I spoke too soon, I think simply cleaning the contacts rattled a short
and dumb luck made it boot the first time. By pressing the fatherboard
I can see characters corrupt when running a program, guess I need to do
some more digging to find out exactly where and why this is happening.
On 1/1/
cleaning the connector pins with a brass brush solved the issue, thanks
everyone!!
On 1/1/2018 5:03 PM, Nick Allen wrote:
Thanks for the tips everyone! I can confirm power is GOOD, and the
problem persists even without the RAM installed (Just CPU and MP-C or
MP-S board). I am going to clean
Thanks for the tips everyone! I can confirm power is GOOD, and the
problem persists even without the RAM installed (Just CPU and MP-C or
MP-S board). I am going to clean the buss connectors and see if it helps!
On 1/1/2018 12:32 PM, Nick Allen wrote:
Hey everyone, Happy New Years! I am thank
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,
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
Date: 2018-01-01 10:32 AM (GMT-08:00)
To: cctalk@classiccmp.org
Subject: Help diagnosing boot issue SWTPC 6800
Hey everyone, Happy
Hi Nick,
The "fatherboard" contacts on the SWTPc can be very intermittent. This also
plagues the OSI bus. I recommend a two step treatment:
1) brush the pins with deoxit gold
2) force nyogel 759G (or the successor compound, I think 759G is discontinued)
into all of the "holes" (pin sockets on
