e location.
Dwight
> From: chr...@pobox.com
>
> The punch aligns with the index hole since we are starting with soft-sector
> media and that's the only hole we have. Then it "clamps" the media and you
> rotate the punch and the media together to align each sector
I think it was Wang that used the outside holes.
Dwight
> Subject: Re: Oddball floppies for trade - 8", HS (outer edge), weird cutout
> To: cctalk@classiccmp.org
> From: ccl...@sydex.com
> Date: Sat, 17 Oct 2015 16:30:16 -0700
>
> On 10/17/2015 04:21 PM, Jay West wrote:
instruction space is read only. A handle in a hardware
memory manager.
Dwight
From: cctalk on behalf of Oliver Lehmann
Sent: Friday, November 13, 2015 2:30 PM
To: cctalk@classiccmp.org
Subject: Re: Z8000 Assembler anyone?
Hi,
it is a working Z8000 system with a
l 1's, not that
one entered all 1's.
Most CRC's do LSB end in first but some do MSB. Try both ways.
Some use a table lookup for a byte at a time rather than bit at a time.
This it is much faster but can't be used for correction ( without difficulty ).
If you have some coding
I wrote an interleave formatter for a friend to use on his H89.
He had an enormous data file that took for ever to read in BASIC.
He couldn't believe it could be made to work so much faster.
Dwight
From: cctalk on behalf of Chuck Guzis
Sent: S
I'm not familiar with a XorOut? I suspect it is to correct for
a different seed values at the tail end.
Does the program let you run it backwards?
As a 16 bit polynomial, it is practical to run it forward 2^16 bit times
to get it back to the seed value.
D
It would then be gated with
possible new updated data and sent down the delay line again.
Tinker Dwight
l order, it may not be worth the hassle.
Order a few extras.
Dwight
Needs some more for the read and write controls.
Is the address latched from the altairmicro? if not you'll need a latch using
the ALE.
You need to add a read port for the various status bits.
Dwight
From: cctalk on behalf of d...@661.org
Sent: S
The Xerox wasn't a single button mouse.
That was patented by Jef Raskin while at Apple.
Dwight
From: cctalk on behalf of Mark J. Blair
Sent: Monday, December 21, 2015 2:39 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: A
ND of the times 2 ( his RAL
)
negating and subtracting is what he want to do, leaving the XOR.
Dwight
From: cctalk on behalf of Christian
Gauger-Cosgrove
Sent: Wednesday, December 23, 2015 7:14 PM
To: clasyst...@gmail.com; General Discussion: On-Topic an
ARG0 ( acc and ARG0 have the xor of the original ARG0 and ARG1 )
I suspect it is similar on a pdp-8 as they have similar ALUs
Dwight
From: cctalk on behalf of dwight
Sent: Wednesday, December 23, 2015 10:38 PM
To: General Discussion: On-Topic and Off-
oops blew it.
MEMA ARG0
A+MA ARG1
ACCM TMP
MEMA ARG0
AND ARG1
A+MA ARG1
ANGA
A+MAM TMP ( both Acc and TMP have XOR of ARG0 and ARG1
I needed three locations
Dwight
From: cctalk on behalf of dwight
Sent: Wednesday, December 23, 2015 11:02 PM
To
Without the TMP on the Nicolet
MEMA ARGONE
ANDA ARGTWO
LASH 1
ANGA
A+MA ARGONE
A+MA ARGTWO ( or A+MM ARGTWO to save in ARGTWO )
The link bit isn't used by LASH or adds on the Nicolet. It is only the carry
out of an add.
It is a little more clumsy to use as a carry. It can only be used as a
co
Awsome!
Merry Chistmas
Dwight
From: cctalk on behalf of Jack Rubin
Sent: Friday, December 25, 2015 5:52 AM
To: Classic Computer List (cctalk@classiccmp.org); ChiClassicCom
(chiclassicc...@yahoogroups.com)
Subject: Massive document depository
This was
raightened pins.
Dwight
From: cctalk on behalf of tony duell
Sent: Friday, December 25, 2015 9:32 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: Piggybacking 74LS logic chips to confirm a suspected fault
> In my experience, the
ed as often or maybe
there are those among us that are just that much better at
covering our tracks.
Dwight
From: cctalk on behalf of Rod Smallwood
Sent: Monday, December 28, 2015 1:45 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: The KGB
Do a search for Olivetti M20. You'll find several people in Italy. The M20
was a Z8000 processor and is more interesting than the 8088/86
machines.
Even so, they may connect you to other DEC collectors.
Dwight
From: cctalk on behalf of Robert Ja
.
The pad must be flat. It can not be cleaned with a
clear disk that is double sided.
Solvents don't work well. I often find a dull knife edge works
well to get crusted gunk off.
The rest, Chuck had stated. Don't mess with
tracking or fiddle with pots that you are not setup properly
to adju
I'm just tired of seeing really nice clocks turned into
a pile of junk.
Dwight
From: cctalk on behalf of Pete Turnbull
Sent: Sunday, February 7, 2016 12:00 PM
To: cctalk@classiccmp.org
Subject: Re: Tired of EVERYTHING with a gear being called STEA
Make sure to neutralize the leaked alkaline stuff from the cells.
Just a simple cleaning isn't enough. I use white vinegar.
Dwight
From: cctalk on behalf of Maciej W. Rozycki
Sent: Monday, February 8, 2016 6:55 AM
To: General Discussion: On-Topi
minute to put a typical adapter
together.
Dwight
From: cctalk on behalf of Brent Hilpert
Sent: Tuesday, February 16, 2016 11:06 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Old MOS Mask-Programmed ROM forgetfulness?
On 2016-Feb-
terminal could then be either current loop or RS232.
It doesn't sound like too complicated a job.
Dwight
From: cctech on behalf of Marc Howard
Sent: Thursday, February 18, 2016 7:40 PM
To: General Discussion: On-Topic Posts Only
Subject: How to use b
w that PCs run so fast.
Dwight
From: cctalk on behalf of Mouse
Sent: Monday, February 22, 2016 6:26 AM
To: cctalk@classiccmp.org
Subject: Re: Helpful Features in a Debugger
> Also possible to be checked are specified values that registers have,
> or d
I can send them a binary or intel hex file.
Dwight
ake a key for it.
I guess they were just the key copy and tumbler replacement
type lock smith.
Dwight
From: cctalk on behalf of Pete Turnbull
Sent: Thursday, February 25, 2016 4:14 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: AC
There are a number of these on ebay for a reasonable price.
I'd think you could just by one for under $6 and not worry about it.
Dwight
From: cctalk on behalf of Marco Rauhut
Sent: Thursday, February 25, 2016 11:07 AM
To: General Discussion: On-
er of heads (6) and RPM speed as
the Olivetti drive used. It had more cylinders but that wasn't an issue.
Dwight
From: cctalk on behalf of Fred Cisin
Sent: Sunday, March 13, 2016 3:13 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re
interesting listing that was to be used by the navy for plotting
two ships courses ( interesting ) for intercept.
Still, in general I'm coming up blank.
Does anyone have a stash of paper tapes or listings?
Dwight
I'd think a stack of supper capacitors would do it.
Dwight
From: cctalk on behalf of Paul Koning
Sent: Wednesday, March 16, 2016 10:32 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: DEC RK05 Emergency Retract Batteries
>
Also, I've found a source for 5.185MHz crystals.
ACE Components has some. They are in San Jose, on Oakland Rd.
Dwight
From: cctalk on behalf of dwight
Sent: Thursday, March 17, 2016 7:51 PM
To: General Discussion: On-Topic and Off-Topic Posts
Su
that can extract the data.
It is also, not that hard to create a socket adapter to read out on
a programmer that can read 2716's. It does require an extra
power supply for the -10V.
Dwight
From: cctalk on behalf of Eric Smith
Sent: Thursday, Marc
if 4008/9 recognize the RPM. The 4040 shows
WPM for both 4289 and 4008/9 but only shows RPM for the
4289. I take that to mean that the 4008/9 doesn't support the
RPM, even with the 4040 processor.
Dwight
From: cctalk on behalf of Eric Smith
Sent:
only. The 4040 is a lot easier to setup for
both write and read from the RAM.
I also have an extra 4004 but it is an early zebra.
I'd like to hang on to it.
Dwight
From: cctalk on behalf of Paul Birkel
Sent: Saturday, March 19, 2016 11:40 AM
To:
l possible RAM banks used.
Also, you see most applications using 1702s instead of 4001
or 4308. I've never seen a 4308 in the wild.
Dwight
Maybe a real fuse in series with a real resistor.
Dwight
From: cctalk on behalf of drlegendre .
Sent: Monday, March 21, 2016 6:50 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Resistor/Fuse replacement (DEC H7104-D)
I don&#
Hi Ben
I have the manual but would be interested in the disk.
Do you know if they are hard or soft sectored?
I suspect they are hard sectored as that was the most common.
There soft sectored was not industry standard and took a special
controller to read.
What are you looking for?
Dwight
Rob, many of your messages are blank.
Dwight
From: cctalk on behalf of Robert Jarratt
Sent: Friday, March 25, 2016 2:25 PM
To: 'General Discussion: On-Topic and Off-Topic Posts'
Subject: RE: Olivetti M24 Mounting Bushes for Bus
I'm thinking that maybe someone should sit outside
your place with a pickup truck and camper shell.
Dwight
From: cctalk on behalf of Brent Hilpert
Sent: Friday, March 25, 2016 3:26 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: c
For many web operations, I keep my browser wide across my screen
for wide content.
Wide wrap makes it hard to read when there is a lot of text.
I type returns as I feel comfortable and do not like reading text
with arbitrary wrap.
Dwight
From: cctalk on
Hi All
I have a number of tapes for the Bruker Aspect 2000.
These are paper tapes. All looking for a good home.
I'd like these to go to someone with one of these computers.
It looks like it included the OS. These are paper tape, not mag tape.
Free Plus shipping.
Dwight
> From: hilp...@cs.ubc.ca
>
> On 2015-Jun-30, at 5:22 PM, dwight wrote:
> > Hi All
> > I have a number of tapes for the Bruker Aspect 2000.
> > These are paper tapes. All looking for a good home.
> > I'd like these to go to someone with one of these co
more about securing things. Tie wraps can help a lot. If your worried
about original, use colored tie wraps that look out of place.
Dwight
> Date: Fri, 3 Jul 2015 16:40:55 -0700
> From: g...@shiresoft.com
> To: General@main.local; main.local:On-Topic and Off-Topic Posts
> cctalk@cl
t has
determined that my address has too many bounces.
There must be a parameter that can be set to adjust the sensitivity.
Dwight
What happened to email. If your into looking at something, look at the
source of this simple email.
What is all that html code for?
This is just a few simple text strings with nothing special needed.
Dwight
Locate the one used for the +5 and measure the voltages on
the pins. It will most likely tell you the issue.
Dwight
I'm not even sure what the machine is. Can you give
a little more information on what it is?
Dwight
> Subject: Re: Linear Power Supply (Conversion Equipment Corp) from a basic
> four 510
> To: cct...@classiccmp.org
> From: a...@ardiehl.de
> Date: Mon, 13 Jul 2015 18:28:
tatic damage!
Tinker Dwight
> 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.
uch how it was
doing it( at least, once you remove memory leaks from the list ).
I'm curious, does anyone program in Ada?
Dwight
ion as a NOP.
This didn't always happen, though.
By changing the order of the reset releases, reset was much more
reliable. Both would start on the first sync pulse from the 4040.
They did need to be closely timed because of the dynamic nature
of the ROM address registers.
Dwight
The most common failures are the horizontal output transistor,
the flyback transformer and the dampening diode.
Dwight
> Date: Thu, 23 Jul 2015 20:10:21 -0600
> Subject: Re: diagnosing an Intel Series II MDS monitor failure
> From: space...@gmail.com
> To: cctalk@classiccmp.org
&
With all the switches, it looks like it has bank switching.
Dwight
> Subject: RE: Mysterious S100 SRAM card
> Date: Fri, 24 Jul 2015 06:20:50 -0700
> From: ri...@bensene.com
> To: cctalk@classiccmp.org
>
> > On Fri, 24 Jul 2015, David Griffith wrote:
> >
> >
Dave, you were going to tell us where you found it?
Dwight
Looking at the flicker for Larry Niven's machine, I see it hada Polymorphic
video card. The machine would have had a parallelkey board. You can see it had
the keyboard connector wiredto it.The drive has the controller built into it,
similar to the Digital Systemsdrive. It would have had a bus
seal.
Again, like the electrolytic that was formed too fast, the cell
will dry out over a month or so and you'll have a worthless
battery pack.
NiCads are best stored discharged. That means bring each
cell to 1 volt. This is hard to measure in a battery pack.
Dwight
I'd think a ridiculously high deposit alone with the contract
would ensure proper use.
Simply state if it is damaged in any way, they keep the computer
and you keep the deposit.
I've done similar in the past and always got things back.
Dwight
> Date: Thu, 30 Jul 2015 07:08:59 -0
dips.
Dwight
> From: space...@gmail.com
>
> On Sat, Aug 1, 2015 at 5:52 PM, dwight wrote:
> > There we two different reference voltages on 723s. I don't recall which
> > was which but one had to change the feedback resistors if you used the
> > wrong one.
>
> There
Well, I had to look it up. The LAS723 comes with a 2.5V reference
and not a 7V.
Dwight
> From: a...@p850ug1.demon.co.uk
>
> Was the failed IC marked '723' or some house number?
>
> -tony Hi Tony As I recall, it was marked LAS723-2.5Luckily, before I simply
> replaced it, I checked the feedbackresistor values. They didn't make sense
> for 7V.My guess is that it made using the 7
at are more than just
the electronics in a metal box. It is more close to the people that
created it.
Dwight
tified chips, made by TRW. (I hope they
> aren't something classified I'm not even supposed to have! :-)
>
> Anyone have any idea what these things are?
>
> Thanks!
>
>Noel
Have you tried an ohm meter on them? They might be R-Packs.
Dwight
This all assumes it is a TTL and not an ECL or even
and analog chip, such as an opamp.
Dwight
most RAMs
fail completely, making such a test useful.
Dwight
> To: cctalk@classiccmp.org
> From: thrashb...@kaput.homeunix.org
> Subject: Wang PC260 memory fault
> Date: Thu, 13 Aug 2015 17:23:17 +0930
>
> Hi List,
>
> So a good friend of mine recently resurrected his ch
metals in the mostly zinc pot metal.
Aluminum has been said to be one of the problem sources.
Dwight
still the spindle that aligns the disk. The piece
on the arm would have to be really out of line to cause the
disk to not seat fully on the spindle.
Dwight
Most of these older module use successive approximation
converters. If you read them too fast, you'll only get a partial
conversion.
A number of manufactures made these modules. Analog Devices,
Harris, Beckman and several others.
Dwight
> From: a...@p850ug1.demon.co.uk
&
more
bits of accuracy.
Tinker Dwight
I left a note there about using CRCs to do data correction. It is
a simpler method for software than normally use.
Dwight
> Date: Sat, 15 Aug 2015 07:24:24 -0700
> From: a...@bitsavers.org
> To: gene...@classiccmp.org; classiccmp.org:On-Topic and Off-Topic Posts
> cctalk@cl
so there was no need to reinforce the HD floppy hub area.
>
> --Chuck
>
>
I'd always wondered why that was so.It has been handy to see which were 360K as
I don't think HD everhad the donut ( maybe rare ).Dwight
There is a clear possibility that there are other problems
in the unit than the CPU chip.
Look at the signals on the buss to see if they all look
proper. I'm suspecting something load on the buss.
Dwight
For shipping, use the proper screws to hold the printer.
I don't recall the proper size. If you don't, you may loose the H
coupler and damage the keyboard.
I also recommend removing the motor and shipping it in a third box.
It is so off balanced that the packing can shift.
Dwight
above 1/2 the sample rate will be reflected into
the values. Anything above the sample rate will be as I
described, a mix of all 1's or all 0's on each sample.
Dwight
eraser. Then when formatting, make sure you select the option to format
as a 360K.
It still may not read well on a 360K drive but that is life.
Dwight
> Date: Tue, 18 Aug 2015 21:30:31 -0700
> From: ccl...@sydex.com
> To: cctalk@classiccmp.org
> Subject: Re: 5.25 floppies that read but
intended to account for this.
Usually the line is lower impedance than the input termination,
requiring the source to absorb the reflected signal.
This is why 422/485 came to be. The impedance of the loads better
match that of the termination.
Dwight
> Subject: Re: RS-232 Tx / Rx monitoring L
> Date: Thu, 20 Aug 2015 13:57:05 -0700
> From: ccl...@sydex.com
> To: gene...@classiccmp.org; classiccmp.org:On-Topic and Off-Topic Posts
> cctalk@classiccmp.org
> Subject: Re: 5.25 floppies that read but don't write
>
> On 08/20/2015 01:04 PM, Marc Verdiell wrote:
>
> > So I tried to force
for a high voltage diode but makes the resistor hotter.
Some red LEDs glow orange when not protected from 12VAC.
You can ask how I know.
Dwight
> From: ccl...@sydex.com
>
> On 08/21/2015 08:36 AM, dwight wrote:
> > I was going to add something but it has already been said several
> > times. I will add that if using a LED on an AC like signal of high
> > voltage, one should use a diode. I recommend using a sh
as well to suppress
line spikes.
You do have to be careful about mounting the LED packages, as they are
not rated for line voltage. That is, if you are expecting a UL rating.
Dwight
> http://dir.gmane.org/gmane.comp.hardware.vintage>
> nntp://news.gmane.org/gmane.comp.hardware.vintage>
>
What does " This newsgroup corresponds to the cctalk mailing list."mean?Dwight
I see. Why would they do that?
Dwight
> From: jw...@classiccmp.org
> To: cctalk@classiccmp.org
> Subject: RE: FYI gmane cctalk group
> Date: Mon, 24 Aug 2015 10:34:03 -0500
>
> That means they are copying the list without permission.
>
> -Original Mes
r.
It is all about free time.
Dwight
> From: billdeg...@gmail.com
>
> I have been there before, Bruce gave a tour of the museum. Worth the
> visit when it's open if you get the chance. The items are not powered
> on and generally speaking items are on picnic tables wit
ng with an Arduino but don't have the need.
Can you be clearer about what your problem was?
Dwight
A pal could have worked as well.
Dwight
On making PC boards, we had a shop mix the top and bottom
layers. They tried to tell us it didn't matter but our boards
had an edge connector, with different fingers on each side.
It was expensive high temperature PC board as well.
Dwight
the heck.
Put an edge connector on the board to deal with programming.
All will fit in a smaller space than the original part.
Dwight
> From: jw...@classiccmp.org
> To: cctalk@classiccmp.org
> Subject: RE: 21MX proms (per request)
> Date: Mon, 7 Sep 2015 17:20:48 -0500
>
se expect it to be faster than 100ns.
Dwight
d be wrong that the 2732s were that way as well.
The TI 2716s were not so friendly.
Intel sold half bad 2716s for 5 volt 2508s. Even after 2716s price dropped,
they still sold 2708s for $32 when you could buy a 2716 for $3 to $4.
Dwight
As often the case, I recall wrong.
I stand corrected.
Dwight
From: dkel...@hotmail.com
To: cctalk@classiccmp.org
Subject: RE: 21MX proms (per request
Date: Thu, 10 Sep 2015 12:09:39 -0700
Yep, looked it up.
2716 and 2732 used a pulsed Vpp( 2708 a well ).
Beyond that they had a static Vpp and
Yep, looked it up.
2716 and 2732 used a pulsed Vpp( 2708 a well ).
Beyond that they had a static Vpp and a PGM pin.
Dwight
I was mistaken.
I've admitted it.
Dwight
> From: a...@p850ug1.demon.co.uk
> To: cctalk@classiccmp.org
> Subject: RE: 21MX proms (per request
> Date: Thu, 10 Sep 2015 19:15:42 +
>
> > As often the case, I recall wrong.
> > I stand corrected.
> > Dwi
It looks like it is to check diode boards.
Dwight
If you still have a working machine, why not disassemble the boot
ROMs. They are only a few instructions long.
Making a listing for the 21MX makes it easy to check them from the front
panel.
As I recall, in the boot sequence, it transfers the ROMs to ram and then
executes it.
Dwight
> From: jw...@classiccmp.org
>
> Dwight wrote...
> > If you still have a working machine, why not disassemble the boot ROMs.
> They are only a few instructions long.
> Not necessary, as the source and binary for all the loader roms is in the
> aforementioned manual.
later execution
and do the wrong thing.
One could do the same kind of thing in the second case and still
cause problems.
Dwight
this "protection" further, to the programmer
> model, with immutable bindings and data structures, shunning variables
> entirely.
>
> --Toby
>
> >
> > Jon
> >
>
If working on a newer X86 processor, this is necessary, not to protect the
code but because the code is cashed and my not be updated in time for
it to be executed.
Write through is expensive and only provided on the data side, if at all.
Dwight
emories
of pushing the I/O instruction on the stack with a return.
I don't recall where I saw this but recall seeing it.
Dwight
for computing but I'm not sure if it is practical
for real time control of complex systems.
Dwight
I get the squiggly lines but no headache.
Strange stuff.
Dwight
> Subject: Re: would like to find blue dg et head looking terminal to go with
> small ecli...
> To: cctalk@classiccmp.org
> From: cu...@charter.net
> Date: Tue, 22 Sep 2015 23:59:39 -0500
>
> On 9/22/2
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