I changed the subject line since unless you recognise 43201 others might not
make the connection :-)
> On 22 Jul 2015, at 4:18 pm, Eric Smith wrote:
> now, I have just wired up the 43201 on a breadboard in microcode ROM
> dump mode, and captured the ROM contents using a logic analyzer.
> Photos:
Previously I posted photos of a Zilog Z8-02 MPD running a copy of the
Z8671 BASIC subset ROM code on a breadboard. The Z8-02 was packaged in
a ceramic leadless QUIP package, and I have only one good QUIP socket,
so I made an adapter that the QUIP socket can plug into, which then
has a very wide 64-
On Tue, 21 Jul 2015, Mike Stein wrote:
On Tue, 21 Jul 2015, Tothwolf wrote:
On Tue, 21 Jul 2015, Mike Stein wrote:
FWIW I'm certainly not about to spend 100s of dollars, not to mention
time spent in sourcing and replacing, to replace the caps in systems
100s? Where are you sourcing your comp
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 complicat
- Original Message -
From: "Tothwolf"
To: "General Discussion: On-Topic and Off-Topic
Posts"
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 to spend 100s of
dollars, not to mentio
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.
Of
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 where
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 alumin
On Mon, 20 Jul 2015, Mark J. Blair wrote:
On Jul 20, 2015, at 18:02 , Tothwolf wrote:
I replace wax paper types with polyester (mylar), polystyrene or
ceramic discs, depending on how they are used in the circuit (note
however that for wound foil types, modern replacement parts do not mark
th
On Tue, 21 Jul 2015, ben wrote:
On 7/21/2015 9:04 AM, Lyle Bickley wrote:
IMHO, these "white papers" indicating that ALL aluminum electrolytic
capacitors decay is obvious nonsense - based on real life experience
- not someones theory...
The whole problem with the caps is the water between foi
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
Rich Alderson wrote:
>
>From: Peter Coghlan
>Sent: Saturday, July 18, 2015 1:27 AM
>
>> Rich Alderson wrote:
>
It is generally a good idea to re-form electrolytic capacitors in power
supplies, and to bench check the power supplies (under some kind of
load) before actually applying
Since you have the HP-85, I'll mention this:
http://www.vintagecomputers.freeserve.co.uk/hp85/prm85.htm
I have one... it's the ultimate for HP-85 owners.
J
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Earl Baugh
Sent: Tuesday, July 21, 2015 2:11 PM
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 r
On 7/21/15 10:23 AM, Henk Gooijen wrote:
-Oorspronkelijk bericht- From: Guy Sotomayor
Sent: Monday, July 20, 2015 11:04 PM
To: General@main.local ; Discussion@main.local:On-Topic and Off-Topic
Posts
Subject: MEM11 Update
As I mentioned previously, I took some time off from working on
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 drool
On 7/21/2015 9:04 AM, Lyle Bickley wrote:
IMHO, these "white papers" indicating that ALL aluminum electrolytic
capacitors decay is obvious nonsense - based on real life experience
- not someones theory...
The whole problem with the caps is the water between foil. As modern caps
use more and mo
-Oorspronkelijk bericht-
From: Guy Sotomayor
Sent: Monday, July 20, 2015 11:04 PM
To: General@main.local ; Discussion@main.local:On-Topic and Off-Topic Posts
Subject: MEM11 Update
As I mentioned previously, I took some time off from working on the
MEM11 for the past several months.
I had
On 21/07/2015 06:14, Eric Smith wrote:
On Mon, Jul 20, 2015 at 4:46 PM, Rich Alderson
wrote:
industry white papers with tables of decay rates for
the aluminum electrolytics that indicate that, *no matter what*, they lose
capacitance over time, until c. 14 years from manufacturer date they are a
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 an
- Original Message -
From: "Tothwolf"
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 _reading_ the
same thing
On Tue, Jul 21, 2015 at 6:34 AM, Al Kossow 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 just checked - the
On Mon, 20 Jul 2015 23:14:36 -0600
Eric Smith wrote:
> On Mon, Jul 20, 2015 at 4:46 PM, Rich Alderson
> wrote:
> > industry white papers with tables of decay rates for
> > the aluminum electrolytics that indicate that, *no matter what*, they lose
> > capacitance over time, until c. 14 years from
> 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.
> 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 messa
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
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.
>
> > 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 rec
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 O
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
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