>
> Been trying to no avail to find any info on this 'MCT' S-100 serial card.
Could this MCT be Modular Circuit Technology, the generic brand of add on cards
once sold in the JDR Microdevices catalog?
Hey guys,
I'm fairly certain this is a serial board - mostly because the PO told me
so, and when I received it, it had a 25-pin male connector on a three-wire
cable carelessly soldered to the pads behind one of the cable headers on
the top edge. But the cable was removed as a matter of course when
> I couldn't spot how they did level shifting to RS232 levels. The SI
> signal appears to go to a 7400 next to one of the Uarts.
There are a couple of 8 pin ICs near the 10 pin headers, they look to
be 1458 dual op-amps (I can't exactly make out the numbers...).
Op-amps were often used as RS23
On Wed, 30 Sep 2015, jwsmobile wrote:
I couldn't spot how they did level shifting to RS232 levels. The SI
signal appears to go to a 7400 next to one of the Uarts.
One of the Uarts is one which requires it would seem 12 v as well, but
it doesn't do the levels for rs232 (AY-3-1015)
I'd need
Well, it's all the same Linux kernel; for each branch of each distribution,
they pick a kernel train they want to run with and then backport patches as
required for security or device driver support from more modern kernels ...
Nothing to stop you from running X kernel (or Z window manager) on Y
di
I couldn't spot how they did level shifting to RS232 levels. The SI
signal appears to go to a 7400 next to one of the Uarts.
One of the Uarts is one which requires it would seem 12 v as well, but
it doesn't do the levels for rs232 (AY-3-1015)
I'd need sharper images and possession of the bo
On Wed, 30 Sep 2015, John Robertson wrote:
On 09/30/2015 5:22 PM, Tothwolf wrote:
I bought a kit from anatekcorp.com last year to replace my Dick Smith
version that spouted legs and was rather disappointed with how it had
been kitted up. A lot of the components were very low quality or did
no
In fact, I did not. Thanks for the tip! ;-)
On Wed, Sep 30, 2015 at 8:18 PM, william degnan
wrote:
> Did you try asking @ retrotechnology.com
>
> Bill Degnan
> twitter: billdeg
> vintagecomputer.net
> On Sep 30, 2015 8:52 PM, "drlegendre ." wrote:
>
> > (Months along, posts to several boards /
Did you try asking @ retrotechnology.com
Bill Degnan
twitter: billdeg
vintagecomputer.net
On Sep 30, 2015 8:52 PM, "drlegendre ." wrote:
> (Months along, posts to several boards / lists, still no help on this one..
> so I'm giving it another shot. I'd really like to use this board)
>
> Been tryi
On 09/30/2015 5:22 PM, Tothwolf wrote:
On Wed, 30 Sep 2015, John Robertson wrote:
On 09/29/2015 2:59 PM, Jay West wrote:
This is the one I have used for years.
http://clientes.netvisao.pt/greenpal/evb1.htm
About $88 USD
That is an authorized Bob Parker variation of his original Dick Sm
I have been using the BK Precision 879B:
http://www.testequipmentdepot.com/bk-precision/lcr/879b.htm?ref=gbase&gclid=
CKj82-uIoMgCFRNrfgodYOYOvA
It's at a completely different price point ($250-ish), and much more than an
ESR meter - but it's a bargain for a full R,C,L,Z meter. Very useful to know
(Months along, posts to several boards / lists, still no help on this one..
so I'm giving it another shot. I'd really like to use this board)
Been trying to no avail to find any info on this 'MCT' S-100 serial card.
I'm pretty sure the card works, as it came from a previously-working system
- but
On Wed, 30 Sep 2015, Jay West wrote:
Question - I could be mistaken, but I think someone mentioned that these
were not good for testing caps that had a higher operating voltage. Is
that correct? My understanding was that the testing method used by this
ESR meter was valid for most all the larg
On Wed, 30 Sep 2015, John Robertson wrote:
On 09/29/2015 2:59 PM, Jay West wrote:
This is the one I have used for years.
http://clientes.netvisao.pt/greenpal/evb1.htm
About $88 USD
That is an authorized Bob Parker variation of his original Dick Smith
ESR meter kit. On this side of the
>Jerome H. Fine wrote:
>Eric Christopherson wrote:
On Tue, Sep 29, 2015, Jerome H. Fine wrote:
This post is for Tim Shoppa.
This have seen your replies every so often on classiccmp, so you
don't seem to be totally out of touch.
If you are reading this, Alan Frisbie and I would appreciate
s
Good primer paper from Sencore (manufacturer of instruments, not
capacitors..) on the nature, causes and effects of ESR:
http://patriotgaming.com/manuals/gaming_monitors/sencore_instruments/LC103/TT104-4416.pdf
On Wed, Sep 30, 2015 at 5:50 PM, drlegendre . wrote:
> "How are
> folks testing the
"How are
folks testing the very large electrolytics in the 25,000, 80,000 or even
100,000 uF range that are encountered in the power supplies of some of
these old machines?"
The method I use is pretty close to what you mention, though I lack an
electronic load. Here are some thoughts...
For measu
On 09/30/2015 02:50 PM, Sean Caron wrote:
Just the whole idea of so many Linux distributions makes me bang my
head against the coffee table. One thing I greatly admire about the
*BSD projects has been the strong arm of unification, all
contributors are working towards one goal... It just so happe
>Jerome H. Fine wrote:
This request is for Al Kossow. However, if anyone else knows
where AA-5286M-TC is located as a PDF on the internet, it
would be appreciated.
I have downloaded the V05.06 PDF from one of the mirrors:
AA-5286L-TC_RT-11_System_Release_Notes_Aug91.pdf
http://bitsavers.traili
>Jerome H. Fine wrote:
This request is for Al Kossow. However, if anyone else knows
where AA-5286M-TC is located as a PDF on the internet, it
would be appreciated.
I have downloaded the V05.06 PDF from one of the mirrors:
AA-5286L-TC_RT-11_System_Release_Notes_Aug91.pdf
http://bitsavers.traili
Just the whole idea of so many Linux distributions makes me bang my head
against the coffee table. One thing I greatly admire about the *BSD
projects has been the strong arm of unification, all contributors are
working towards one goal... It just so happened that Linux was the "free
UNIX that took
You can still have a useful machine without it being connected to the
public Internet. Network access is indeed very important, Internet
connectivity, less so.
I too rue the loss of simplicity ... and this has been voiced by many
people much more luminous than I ... Ken Thompson, for one, has comm
I can put in another vote of confidence for this one. I have one from Portugal
(because I didn’t know about the this-side-of-the-pond source) and it works as
advertised.
- Mark
On Sep 30, 2015, at 12:54 PM, John Robertson wrote:
> On 09/30/2015 7:14 AM,
Plus a million. You can still view my personal page and get the full
experience in Netscape 2.0, Mosaic and so forth :O
Best,
Sean
On Wed, Sep 30, 2015 at 11:38 AM, Mouse wrote:
> > If you want to have a system that's network-capable, which is pretty
> > much mandatory for a _really_ usable s
On 09/30/2015 7:14 AM, Jay West wrote:
John wrote
That is an authorized Bob Parker variation of his original Dick Smith ESR meter
kit. On this side of the pond they were made by Anatek until the owner was
killed in an accident, then the series (now called the Blue ESR) is made by
Allt
On 09/30/2015 7:14 AM, Jay West wrote:
John wrote
That is an authorized Bob Parker variation of his original Dick Smith ESR meter
kit. On this side of the pond they were made by Anatek until the owner was
killed in an accident, then the series (now called the Blue ESR) is made by
Allt
On Wednesday (09/30/2015 at 10:54AM -0700), John Robertson wrote:
>
> As for testing large capacitors, about the highest value that gives useful
> readings is around 10,000ufd. Larger than that and the ESR is too close to
> zero ohms unless the cap is really bad...
And that seems to be the usual
On 9/30/2015 3:13 PM, Liam Proven wrote:
> On 30 September 2015 at 17:08, Noel Chiappa wrote:
>
>> I am _very much_ in sympathy with the complaints here; I too feel that modern
>> computers are too complex, etc. (Although some of it, like the entire
>> computer
>> turning into a single chip, wer
On 30 September 2015 at 17:08, Noel Chiappa wrote:
> I am _very much_ in sympathy with the complaints here; I too feel that modern
> computers are too complex, etc. (Although some of it, like the entire computer
> turning into a single chip, were/are inevitable/unavoidable.)
Indeed so.
> I like
On Wed, Sep 30, 2015 at 12:31 PM, ben wrote:
> On 9/30/2015 12:24 PM, W2HX wrote:
>
>> Essentially these are two different measurements meant to measure a
>> different property of the capacitor. Capacitors have many properties,
>> many we know such as capacitance, working voltage, temp coefficien
On 9/30/2015 12:24 PM, W2HX wrote:
Essentially these are two different measurements meant to measure a
different property of the capacitor. Capacitors have many properties,
many we know such as capacitance, working voltage, temp coefficient,
etc. Add to that list both leakage current (parallel re
Essentially these are two different measurements meant to measure a different
property of the capacitor. Capacitors have many properties, many we know such
as capacitance, working voltage, temp coefficient, etc. Add to that list both
leakage current (parallel resistance) and ESR (series resistan
> If you want to have a system that's network-capable, which is pretty
> much mandatory for a _really_ usable system in this day and age, i)
> that means Web-capable, and ii) if it's Web-capable today, it has to
> be able to handle what I dub 'active content' (JavaScript, etc) -
> i.e. content comi
> From: Liam Proven
I am _very much_ in sympathy with the complaints here; I too feel that modern
computers are too complex, etc. (Although some of it, like the entire computer
turning into a single chip, were/are inevitable/unavoidable.)
I like the functionality of modern system, but I feel
On 30 September 2015 at 16:55, Eric Christopherson
wrote:
>> The keyboard is one of these:
>>
>> http://www.computinghistory.org.uk/det/12269/LMT-68FX2-Keyboard-for-the-Spectrum/
>
> That's cool; but that is the strangest layout I've seen for arrow keys.
Yes, as I recall, it took a *lot* of gett
On 30/09/2015 15:55, Eric Christopherson wrote:
://www.computinghistory.org.uk/det/12269/LMT-68FX2-Keyboard-for-the-Spectrum/
That's cool; but that is the strangest layout I've seen for arrow keys.
This is a case for a ZX Spectrum. When it comes to anything Sinclair,
strange is the norm! :)
On Wed, Sep 30, 2015 at 9:31 AM, Liam Proven wrote:
> On 29 September 2015 at 19:06, SPC wrote:
>> Very interesting. I must do an end-of-training project this year involving
>> Rapsberry Pi devices. Perhaps I'll give it a try.
>
>
> I just ordered a Pi 2, fitted inside a modified replacement keyb
On 09/29/2015 2:59 PM, Jay West wrote:
This is the one I have used for years.
http://clientes.netvisao.pt/greenpal/evb1.htm
About $88 USD
J
That is an authorized Bob Parker variation of his original Dick Smith
ESR meter kit. On this side of the pond they were made by Anatek until
the
John wrote
That is an authorized Bob Parker variation of his original Dick Smith ESR meter
kit. On this side of the pond they were made by Anatek until the owner was
killed in an accident, then the series (now called the Blue ESR) is made by
Alltronics and sold by dealers such as I. The
On 29 September 2015 at 19:06, SPC wrote:
> Very interesting. I must do an end-of-training project this year involving
> Rapsberry Pi devices. Perhaps I'll give it a try.
I just ordered a Pi 2, fitted inside a modified replacement keyboard
for a ZX Spectrum that I found when packing up my house
Hi Guys
I think we are all set. The plexiglass blanks are at the silk
screeners.
The artwork for five different PDP-8 front panels is done.
If all those who elected to wait even though prepaid would
please request the latest file with all five designs in.
>> to model this using ideal components, [...]
> So I'm slightly confused; you talk about the model being a parallel
> resistor (which I get), but then switch to a series resistor. Why
> the switch?
The two resistors model two different ways in which a capacitor is not
ideal. The parallel resist
From: Eugene (W2HX)
> to model this using ideal components, we show a resistor in parallel to
> the capacitor ... This modeled parallel resistor represents the leakage
> current.
> ...
> because it is not ideal, some power is dissipated. This dissipated
> power is repre
Just to clarify a little more (at the risk of being explaining things everyone
already knows)...
In an ideal capacitor, after the capacitor has charged, all DC current is
blocked. However, when applying a DC voltage to a real capacitor, some small
current will continue to flow as electrons pass
Holm Tiffe wrote:
> Ken Seefried wrote:
>
> > I'm going to be working on my 11/730s power supply, so I'm in the
> > market for an ESR meter. I've seen some (older) recommendations for
> > the AnaTek 'Blue' and various 'Dick Smith' derivatives. However, eBay
> > is flooded with knockoff Mega328
That works for me.
Joe
On Sep 29, 2015, at 9:36 PM, j...@mercury.lcs.mit.edu (Noel Chiappa) wrote:
>> From: Joseph Lang
>
>> How many do you want?
>
> How many do I need, or how many do I want? :-)
>
> I'm tempted to buy the whole bin (unless it's like a 55 gallon barrel :-),
> and hold onto
Ken Seefried wrote:
> I'm going to be working on my 11/730s power supply, so I'm in the
> market for an ESR meter. I've seen some (older) recommendations for
> the AnaTek 'Blue' and various 'Dick Smith' derivatives. However, eBay
> is flooded with knockoff Mega328 based ESR/Transistor/SCR/etc. t
It seems you may be using two terms interchangeably that have different
meanings. Leakage is parallel resistance (DC) and ESR is series resistance
(actually impedance so it is frequency dependent. Typically 120 Hz with a full
wave bridge rectifier in front of it).
-Original Message-
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