On Mon, 20 Jul 2015 23:14:36 -0600
Eric Smith space...@gmail.com wrote:
On Mon, Jul 20, 2015 at 4:46 PM, Rich Alderson
ri...@livingcomputermuseum.org wrote:
industry white papers with tables of decay rates for
the aluminum electrolytics that indicate that, *no matter what*, they lose
- Original Message -
From: Tothwolf tothw...@concentric.net
Sent: Monday, July 20, 2015 10:03 PM
... I too am getting tired of repeating the same
thing over and over; compiling this sort of
information in a single location might be
helpful.
As it happens I am getting tired of
On Tue, Jul 21, 2015 at 6:34 AM, Al Kossow a...@bitsavers.org wrote:
http://www.microcenter.com/product/430528/BeagleBone_Black#
There aren't any stores in the SF Bay area, so this won't do me
any good, and it isn't clear how many are available.
My local Micro Center is the main store. I
Made a lot of progress today.
I just wrote a hello world program and got it working so the UART
output shows up on the simulator.
Took a bit more work as there were a couple of subtle bugs lurking in
paths I hadn't fully exercised
previously (it's the nature of things). It was more
On Tue, 21 Jul 2015, Mike Stein wrote:
I suspect that the real criterion for whether to shotgun-replace caps is
who is paying/getting paid for the materials and labour ;-).
I dunno about that. When I've done commercial boards such as industrial
process controllers and CPUs for customers with
On 7/21/15 6:25 AM, Noel Chiappa wrote:
It was interesting to re-read your original message; I and a couple of other
people are looking into doing a QBUS card to provide access to modern
non-volatile storage (SD cards, USB thumb drives), and in discussing the
internal design, we'd planned on
On 07/21/2015 06:46 PM, Tothwolf wrote:
I dunno about that. When I've done commercial boards such as industrial
process controllers and CPUs for customers with nearly unlimited funds,
I charged the customer based on an hourly rate. Since I use a vacuum
desoldering tool, changing out 10-15
On Tue, 21 Jul 2015, tony duell wrote:
On Mon, 20 Jul 2015, Tothwolf wrote:
Yes, the grid cap would /usually/ be a non-polarized wax paper type,
which tend to be very unreliable. I've yet to find a wax paper type
which will pass a leak test and those are also on my replace on sight
list.
Folks,
With the help of my local rescue buddy (Jeff) we had a pretty busy week
rescuing a big chunk of things from basements.
(and saw a lots of other interesting things... a 90% assembled Rutan EZ in
one basement and a very cool, oscilloscope that
would probably have have had a lot of folks
On 7/21/15 12:10 PM, Earl Baugh wrote:
Folks,
4x Otrona Attache's (and a huge plastic tub of original replacement
parts... a first look indicates enough to build at least 1 more machine)
Some of these have the 8086 accessory board that allows it to run MS-DOS
(along with the CPU it normally
On 07/21/2015 06:56 PM, Tothwolf wrote:
I've often wondered why they even bother to put that polarity stripe on
modern film parts when it doesn't actually indicate the outside foil
terminal. Maybe this is something that has become lost knowledge to
manufacturers over the years to the point
- Original Message -
From: Tothwolf tothw...@concentric.net
To: General Discussion: On-Topic and Off-Topic
Posts cctalk@classiccmp.org
Sent: Tuesday, July 21, 2015 9:46 PM
Subject: Re: PDP 11 gear finally moved
On Tue, 21 Jul 2015, Mike Stein wrote:
...
FWIW I'm certainly not about
Rich Alderson ri...@livingcomputermuseum.org wrote:
From: Peter Coghlan
Sent: Saturday, July 18, 2015 1:27 AM
Rich Alderson ri...@livingcomputermuseum.org wrote:
It is generally a good idea to re-form electrolytic capacitors in power
supplies, and to bench check the power supplies (under
On Mon, 20 Jul 2015, Rich Alderson wrote:
the aluminum electrolytics that indicate that, *no matter what*, they
lose capacitance over time, until c. 14 years from manufacturer date
they are at 10% of rating.
Please excuse me, but this is utter nonsense.
Most electrolytics in our machines are
But yes, selenium rectifiers rarely work now (although there are exceptions)
and when they fail they can take out the mains transformer. And they smell
horrible (think of school dinner cabbage!)
Huh? All devices with selenium rectifiers that I/we own are OK. And a
selenium rectifier
http://www.microcenter.com/product/430528/BeagleBone_Black#
There aren't any stores in the SF Bay area, so this won't do me
any good, and it isn't clear how many are available.
Hi Guys
As usual I try to keep you updated on front panel
progress.
(Always supposing I know where I am!!)
I now have _prototype_ white seperation artwork for four front PDP8 panels
1. pdp8/e Type A
2. pdp8/e Type B
3. pdp8/f
4. pdp8/m
I am doing all four together as they
On Tue, 21 Jul 2015, tony duell wrote:
But yes, selenium rectifiers rarely work now (although there are exceptions)
and when they fail they can take out the mains transformer. And they smell
horrible (think of school dinner cabbage!)
Huh? All devices with selenium rectifiers that I/we own are
On Sun, 19 Jul 2015, dwight wrote:
I have rarely seen static damage to electronic parts. I can imagine that
if I were in Nevada during winter time, I might see more. There were
times when, even with a key to be the discharge point that my arm still
jumped.
On parts, the ones I've seen that I
From: Guy Sotomayor
I took some time off from working on the MEM11 ... I had some time over
the past few days, so I spent it working on the simulator.
Excellent news!
Right now all of the J1 instructions seem to simulate properly.
I had to go hunt up your original message:
From: a...@p850ug1.demon.co.uk
To: cctalk@classiccmp.org
Subject: RE: PDP 11 gear finally moved
Date: Sun, 19 Jul 2015 14:35:52 +
Be careful, static daamge does not always show up at the time. You can
damage an IC, have it work for some time afterwards and then fail.
I'm
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