On 03/30/2017 01:21 PM, ben via cctalk wrote:
> Well that does not solve the ring, but off loading the SD card is a
> good idea, if you have the software time for a new cpu. Most of the
> time upper managment drags thier feet, unless they want it
> yesterday. Ben.
Well, Noel has stated that this
On 03/30/2017 08:04 PM, jim stephens via cctalk wrote:
> As to recommendations, I like the Country Inn & Suites by Carlson in
> Sunnyvale, which is at Ca 237 and Caribbean. If you run around by
> the bay is Weird Stuff, and it is about 2 or so miles from the CHM.
> At 237 Caribbean becomes Lawren
On 03/30/2017 08:31 PM, Al Kossow via cctalk wrote:
> Phelen Ave in San Jose, which was before the larger place on Sycamore
> in Milpitas.
In the late 70s, on Evelyn in Sunnyvale, near Wolfe, I believe. I
could check my old records.
I recall when John Fry opened his store, the big seller was C
On 03/30/2017 08:56 PM, Bob Rosenbloom via cctalk wrote:
> Corporate Systems Center, and Martin, still exist, as Digital
> Loggers, on Walsh Av. I still work there, 20+ years...
I still have the manuals and software for his Fastcache and Fastecache
32 SCSI controllers. Got rid of the cards thems
On 03/30/2017 09:07 PM, Tony Duell via cctalk wrote:
> The fundamental rule is 'You can't change the voltage across a
> capacitor instantly'. There is a related one 'You can't change the
> current through an inductor instantly'. It (of course) doesn't matter
> if said capacitor or inductor is an
On 03/31/2017 11:17 AM, Al Kossow via cctalk wrote:
>
>
> On 3/30/17 9:29 PM, Chuck Guzis via cctalk wrote:
>
>> In the late 70s, on Evelyn in Sunnyvale, near Wolfe, I believe.
>
> That would be the original Halted location, Evelyn and Wolfe
>
> Halted moved t
On 03/31/2017 06:15 PM, Jon Elson via cctech wrote:
> I have a project I do from time to time using 128-lead 14mm TQFPs
> with 0.4mm lead spacing. I use a stereo zoom microscope with a
> home-made LED ring light. First, I rub the pads with a pencil eraser
> to remove oxidation caused by reflow tem
On 04/01/2017 08:28 AM, Jon Elson wrote:
> On 03/31/2017 11:15 PM, Chuck Guzis via cctech wrote:
>> I use pretty much the same method, but start off with just a
>> binocular loupe and then finish with a stereo microscope for final
>> inspection.
> Oh, the trick for this is there are inspection micr
On 04/01/2017 01:45 PM, Al Kossow via cctalk wrote:
>
>
> On 4/1/17 12:33 PM, Dominique Carlier via cctalk wrote:
>> strange machine, there is a tape reader inside the printer.
>
> it is used to program vertical forms postioning. the format tape is
> in a loop
...and whatever you do, don't los
On 04/01/2017 07:01 AM, Paul Koning via cctalk wrote:
>
> Before building my most recent project (which involves an
> unpleasantly small-pitched TSOP package housing multiple RS232 level
> converters) I asked experts at work (technicians who do a lot of fine
> detail soldering) about RoHS.
>
> T
On 04/01/2017 07:41 PM, John Wilson via cctalk wrote:
> - I do QFPs (0.5mm and 0.4mm) using a cheap eBay binocular
> microscope, Ameritronics solder paste, and a toaster oven controlled
> by an Arduino with a homemade shield on it (with a MAX6675 for a
> K-type Sparkfun thermocouple which I positi
On 04/02/2017 07:53 AM, Diane Bruce wrote:
> Read this:
>
> https://nepp.nasa.gov/whisker/reference/tech_papers/2011-nasa-gsfc-whisker-failure-app-sensor.pdf
There are problems with the site's certificate, but I was able to wget
the paper using the --no-check-certificate option.
Tin whiskers we
On Mon, Apr 3, 2017 at 9:37 AM, AJ Palmgren via cctech <
cct...@classiccmp.org> wrote:
> Hi, Plamen & Al,
>
> I'm just catching up on some of these past threads involving QIC
> cartridges. What ever became of these Paragon tapes? Were you able
> to read them and archive the contents?
I'm pro
On 04/03/2017 01:29 PM, Cameron Kaiser via cctalk wrote:
> I'm almost afraid to see if the one Jim Battle sent me a long time
> ago still works.
This points up to a common misunderstanding among vendors, I think. I
question the use of QIC for *archival* storage; it certainly was less
expensive
On 04/03/2017 03:39 PM, Ed via cctalk wrote:
>
> interesting... hp-9000 in the news! -
> russian-hackers-used-backdoor-two-decades
>
> https://www.wired.com/2017/04/russian-hackers-used-backdoor-two-decades/?mbi
> d=nl_4317_p3&CNDID=42833909
Indeed this:
“This is a field that’s not unders
On 04/03/2017 08:31 PM, Chris Elmquist wrote:
> The OS for the ETA -10 was installed from QIC tape because you put it
> in through an Apollo DN3000 or similar service unit... pretty sure
> that was THE way to get 'er done on that machine.
Hmmm, on the STAR (CYBER 200), it was loaded from the MC
On 04/10/2017 11:41 AM, Dave via cctalk wrote:
> I have a Harris RTX-2000 based system control board for a long
> defunct system. The board worked when removed more than 20 years ago
> in the mid 90's. The RTX-2000 is a stack-based processor designed
> for running FORTH. I think it was designed
On 04/10/2017 02:49 PM, Jecel Assumpcao Jr. via cctalk wrote:
Thanks for the list--I was aware of the various Java engines and the WD
P-code engine, but had never run into the SCAMP.
> Some architectures that are considered general purpose have included
> features to support specific languages.
On 04/10/2017 04:47 PM, Jecel Assumpcao Jr. via cctalk wrote:
> The 64KB segments in the 8086 were not a problem for Pascal (or
> Smalltalk, as shown by the Xerox PARC Notetaker computer) because each
> heap object and each proceedure can live in a different segment to take
> advantage of the whol
On 04/10/2017 02:23 PM, Eric Smith wrote:
> When the 432 project (originally 8800) started, there weren't many
> people predicting that C (and its derivatives) would take over the world.
That's the danger of a too-aggressive CISC, isn't it? I suppose that
it's safe to say that if you look under
On 04/11/2017 10:05 AM, Paul Koning wrote:
>
> Back then it would have seemed a reasonable assumption that high
> level, strongly typed, languages would continue to flourish. If you
> assume Algol or Pascal or Ada, a machine like the 432 (or like the
> Burroughs 5500 and its descendants) makes p
On 04/11/2017 04:47 PM, Eric Smith wrote:
> Apparently there was little concern for either Fortran or COBOL, the
> most widely used programming languages at the time.
So FORTRAN/Fortran and COBOL are still with us and the 432 is dust.
There's a lesson there somewhere...
--Chuck
On 04/11/2017 04:53 PM, Jecel Assumpcao Jr. via cctalk wrote:
> I consider the heart of any modern high performance CPU to be a
> dataflow architecture (described as an "out of order execution
> engine") with a hardware to translate the macrocode (CISC or RISC) to
> the dataflow graph and tokens o
On 04/11/2017 06:24 PM, Jecel Assumpcao Jr. via cctalk wrote:
>
> I was not aware that there had been any out of order implementations
> after the IBM ACS until the second half of the 1990s. Given Cray's
> passion for simplicity, I would not expect any of his designs to use
> o-o-o (specially
On 04/11/2017 07:03 PM, Charles Dickman via cctalk wrote:
> The Balkanized nature of programming is interesting.
>
> I make a comment about C and get a flurry of responses, but ask a
> question about a programming language that is also very common for
> machine control and get no response at all
On 04/12/2017 09:46 AM, Stefan Skoglund via cctalk wrote:
> Anyone with access to a distribution of SDT (Telelogik's SDL
> programming system) for old era SunOS 4 ? I have a SS10 which is a
> beggar for SDT (or KEE or Frame.)
Well, there you go--another reason for the tower of Babel. STL, at
fir
On 04/11/2017 07:03 PM, Charles Dickman via cctalk wrote:
> The Balkanized nature of programming is interesting.
>
> I make a comment about C and get a flurry of responses, but ask a
> question about a programming language that is also very common for
> machine control and get no response at all
I think a better question is "Why do you choose to write C (or any other
language)?"
I can speak for myself--I can't say for sure, but I've written at least
hundreds of thousands of line of assembly (not "assembler", please!)
language, much of it on mainframes, back when mainframes were fairly
slo
On 04/12/2017 12:41 PM, Warner Losh via cctech wrote:
> For you and me both. I was getting read errors on my RX-50, so I
> tried to swap in a new drive, and now that's all I get as well. Guess
> I'll have to figure out another way to get the Venix/86R disks
> copied.
Got a PC with a 5.25" HD driv
On 04/12/2017 03:17 PM, allison via cctalk wrote:
>
> What the heck its religion. So here's my stir...
>
> BASIC, why is that the most universal language implemented on nearly
> every micro and many other systems.
>
> Seriously it is a suck language but it gets work done.
No kidding. I'm sure
On 04/13/2017 12:30 PM, Rich Alderson via cctalk wrote:
> From: allison Sent: Wednesday, April 12, 2017 3:18 PM
>
>> BASIC, why is that the most universal language implemented on
>> nearly every micro and many other systems.
>
> Because it was the language offered on the GEIS timesharing system
>
On 04/13/2017 02:19 PM, Brent Hilpert via cctalk wrote:
> While one might argue the proliferation of BASIC on micros followed
> from BG/PA & SW/SJ, I'd say their implementations were following a
> trend rather than initiating it. BASIC was gaining prominence prior
> to their implementations of it.
On 04/13/2017 05:47 PM, Jerry Weiss wrote:
> Then my dad got transferred to Chicago and that high school had
> “access” to IITRAN. By access, that meant punching cards, and
> waiting for the teacher to load in batch and waiting for the results.
>
>
> Losing the interactive aspect overshadowed t
On 04/13/2017 09:05 PM, Don North wrote:
> I especially liked the Spanish language version of IITRAN:
> http://www.ak6dn.com/stuff/spantran.pdf
That does look like a TTY session. But the use of "hacer" (infinitive)
for "DO" is puzzling. I would have made it the imperitive "haga".
--Chuck
On 04/14/2017 08:09 AM, Paul Koning via cctalk wrote:
> For that matter, APL itself also still exists, the OpenAPL open
> source implementation for example. Works nicely.
...but reduced to a marginal language. I wonder if there's any JOVIAL
still in use...
--Chuck
On 04/14/2017 10:05 PM, dwight via cctalk wrote:
> I have a tiny APL that was written for the 8080 someplace.
Just curious, has anyone saved the MCM/70 APL code?
--Chuck
My experience with thermal fax paper is that printed copy is best
preserved. I discovered a couple of years ago, that manufacturers'
faxed copies of data from the early 1990s have faded almost to
unreadability.
Not black, but faded, as with disappearing ink
Storage was in a file folder in a file
On 04/17/2017 01:23 PM, Guy Dawson via cctalk wrote:
> I think timing had a lot to do with C's success.
>
> It's a decent language and at the time powerful and flexible compared
> to other languages. Universities picked up UNIX and C and taught a
> lot of students. The went forth taking their skil
On 04/17/2017 05:43 PM, Terry Stewart via cctalk wrote:
>>> It may also be that is just doesn't support 77 and can only do 80
>>> tracks.
>
>> I don't think it is this. I can format it fine with 77 tracks
>> using 22DSK
> and IMD. It has no problem reading or >writing to 77 track formatted
> dis
On 04/17/2017 07:01 PM, Terry Stewart via cctalk wrote:
> Yes, the point is Fred, it didn't. So, if /N is 15, then it must
> ONLY accept T:40 or 80, yea?
WinNT/2K/XP will read Japanese PC98 MS-DOS 1024*8*2*77, but I don't know
if it'll format that particular format (never tried).
--Chuck
On 04/17/2017 09:20 PM, Fred Cisin wrote:
> Is track 0 sector 1, formatted as 512BPS? If not, how does it even
> come up with the idea to try 1024BPS? (in order to read it, to find
> out that it should try it for reading it...)
>
> (at location 0Bh in the BIOS Parameter Block, is the bytes per
>
On 04/20/2017 10:49 AM, Shoppa, Tim via cctalk wrote:
> I remember a PDQ Bach radio quiz show where the prize was The Wagner
> Ring Cycle on convenient 45 RPM records.
Not to throw a wet blanket on Prof. Schickele's gag, but there *were*
(and still are--Standard Vinyl will cut them for you) 12"
On 04/20/2017 02:12 PM, Glen Slick via cctalk wrote:
> What's the thoughput of a station wagon full of Blue-Ray discs
> hurtling down the highway?
Depends on the destination. For Tristan da Cunha, I'd say it was zero.
--Chuck
On 04/20/2017 02:35 PM, Fred Cisin via cctalk wrote:
> It would only be a bit more than a million 8" SSSD floppies.
Best to be period-correct. First 72 columns of an 80-colum punched
card. Wonder if you could find a card punch that could do the deed
before it broke down.
--Chuck
On 04/21/2017 12:28 PM, Paul Koning via cctalk wrote:
> Multi-user communication systems of a somewhat different architecture
> are even older: "Notes files" on the PLATO system.
AUTODIN and predecessors, such as ComLogNet extend into the 1950s.
--Chuck
Mike Lowen's got some photos here:
http://q7.neurotica.com/LSSM/
Sadly, I don't see any of what I would call "large scale" systems.
Mostly minis and small mainframes.
--Chuck
On 04/24/2017 06:51 AM, dwight via cctalk wrote:
> Many format programs don't look at the index anymore as it isn't
> important for reading the disk. It is only used to indicate that the
> disk is turning.
That may be true for some systems, but for the NEC 765-based controllers
found in PCs, the
On 04/24/2017 02:40 PM, Terry Stewart wrote:
> Guys, you were on the right track. I looked carefully the disk
> surface while rotating it. It's subtle but there is a radial
> kink/distortion in the platter. You can only really see it if you
> have strong light, like that from a bulb, reflecting
On 04/26/2017 02:44 PM, Ed via cctalk wrote:
> OK here is a photo!
>
> Can you get a shot of the back of it~!? or a shot downwards at the
> keys? could be a terminal... could be a computer... with no further
> info .. a terminal would be my first guess... Ed#
Without seeing the keyboard
On 04/27/2017 10:42 AM, Ethan Dicks via cctalk wrote:
> It's not impossible to find another TM-100-1 or replace it with a
> TM-100-2 (more common, owing to its appearance in the IBM 5150 PC),
> but I'd like to just repair this one and get back to TRS-80 hacking.
The issue with Jugi's artistry
> On Thu, 27 Apr 2017, Ethan Dicks via cctalk wrote:
>
>> Additionally, for a testing framework to poke signals through the
>> drive for debugging during the repair, what's a good platform? A
>> PC running MS-DOS? The TRS-80 Model 4 itself? Besides doing
>> directories, are there any good bit
On 04/28/2017 09:20 AM, Al Kossow via cctalk wrote:
> I wish I knew of a gasket material I could trust to survive.
> Norprene is polypropylene based, as opposed to PVC, polyurethane,
> etc.
>
> Home weather stripping is made from polyurethane.
>
> This is the stuff I'm going to try
> http://www
On 04/28/2017 10:01 AM, Ethan Dicks via cctalk wrote:
> So that's where I'm at - the drive was working before the power was
> jiggled and now it's not and it doesn't appear to be the
> electronics.
Make sure that the head is making good physical contact with the medium.
Sometimes the head susp
Much of what used to be power-hungry connectivity hardware for me has
gone low-power, so I'm scaling back my UPS setup some.
I've got an Elgar IPS1100, nominally rated at 1KVA sine-wave continuous
(9.2A 60 Hz 120VAC). It's a pretty good-sized UPS, with fan cooling.
It takes 48V in SLA cells (has
On 04/29/2017 10:28 AM, Michael Thompson via cctech wrote:
> The RICM just received $1,000 to buy a new oscilloscope. I would like
> a four channel. and color would also be nice. The bandwidth doesn't
> need to be high because we usually work on ancient equipment.
The Rigol scopes have the feature
On 04/30/2017 07:38 AM, Mike Loewen via cctalk wrote:
>
> Looking for recommendations for a bulk tape eraser for SDLT and DLT
> IV tapes.
If it's just a small quantity to be erased, there are many Radio Shack
videotape erasers being offered, some NIB, all for about $20. I've used
one for years
I'll add that using the little Radio Shack "high power" device well, is
not a simple matter--the trick is to keep the eraser moving and using
different angles and distances.
If you want a high-power tape *degausser*, be prepared to part with some
real cash--the low end seems to start just north o
On 04/30/2017 08:55 AM, Al Kossow via cctalk wrote:
> You may as well run them through a shredder. All modern tapes have
> embedded servo tracks.
Certainly not DLT IV tapes--I've done the bulk eraser thing with them
and the result re-recorded just fine.
But then, DLT IV is hardly modern.
--Chuck
On 04/30/2017 06:22 PM, Jerome H. Fine via cctalk wrote:
>> Chuck Guzis via cctalk wrote:
> FORTUNATELY, I had an old voice coil fram a speaker available. It
> must have been a large speaker because the coil was a cylinder about
> 3" in diameter and about 3" long. The
On 05/03/2017 04:49 PM, Systems Glitch via cctalk wrote:
> Finished building a prototype mezzanine board and testing with the
> IM6100 (PDP-8 on a chip) in the 560Z board today. Full writeup:
>
> The lamp register is on a mezzanine for a few reasons. First off,
> octal vs. hex grouping! It really
On 05/03/2017 05:37 PM, Systems Glitch wrote:
> I want to say the only 12-bit work I've done has always been octal
> (PDP-8), but 8- and 16-bit has been a mix. I can switch between them,
> but it's kinda like using vim and $graphical_work_editor -- you use
> vim on a weekend long hack session and
On 05/04/2017 04:30 PM, js--- via cctalk wrote:
> On 5/4/2017 6:16 PM, Terry Stewart via cctalk wrote:
>>> If these are from a VAX, could they be microcode disks for a
>>> 11/780?
>> There was a RX01 attached via a LSI-11 as console.
>
> And yet, if there were an RX02 somewhere on this VAX, I don
On 05/05/2017 10:24 AM, Jon Elson via cctalk wrote:
> If you can read the first block on track zero, it will probably make
> it clear what the file system is.
I apologize for being dense in this discussion, but it's pretty clear
that the disks are RX02 "double density" (I hesitate to call them MF
On 05/05/2017 11:19 AM, Bill Gunshannon wrote:
>
> Not really, in the event they would like them read and we know they
> are RX02 there are a number of people here who likely could read them
> (myself being one of them!)
Just image them sector-by-sector and let folks fool with the images.
The fil
On 05/05/2017 12:20 PM, Fred Cisin via cctalk wrote:
> This is a rare occasion that I will disagree with Chuck.
I'm fine with that. Let a thousand flowers bloom...
> Yes, there are situations, where the file system is unknown or not
> understood, where the best approach is to copy all of the se
On 05/05/2017 01:14 PM, Fred Cisin via cctalk wrote:
> Although, when I have an "unknown" disk, before I launch a sector
> editor, I type "DIR", just in case it ISN'T anything challenging. I
> didn't try flux-transition until I failed with my sector editor.
The hardest that I've run into so fa
It's okay, Fred. I know what Adrian meant.
BTW, there's a photo of the the panel in question here:
http://www.vcfed.org/forum/showthread.php?53352-the-smashed-8i-resto-project-of-sorts&p=459110#post459110
--Chcuk
On 05/08/2017 01:37 PM, Fred Cisin via cctalk wrote:
> On Mon, 8 May 2017, Adri
Looking at this documents:
http://www.samhallas.co.uk/repository/telegraph/data_set_101c.pdf
I sill can't figure out what a lot of the stuff inside is for.
--Chuck
On 05/10/2017 10:22 AM, Shoppa, Tim via cctalk wrote:
> The Model 33's I bought back when I was a teenager, were all ex-Telex
> use and had exceedingly complicated wiring harnesses as well as
> built-in modems. They had paper tape readers and punches with various
> auto-start/auto-stop relay option
On 05/11/2017 07:45 AM, Paul Koning via cctalk wrote:
> Computer drawn characters are older than that; a good example of
> vector drawn characters is the CDC 6600 console, from around 1964.
> Or the plotter library documented in report MR 73 from the
> Mathematical Center in Amsterdam, April 1965.
I received the following email from Michael Veselov. Please address
your inquiries directly to him at mihail.vese...@gmail.com:
--
Hello!
We have 3 old Russian computers ДВК-3 and we want to sell them. There
are photos h
On 05/18/2017 08:16 AM, allison via cctalk wrote:
> The real question is why BBS? What is it trying to fix or enable?
You put the words into my mouth. Thank you.
--Chuck
On 05/18/2017 10:44 AM, geneb wrote:
> Because. That's why. :)
Well, okay--but then let's be period-correct. The PDP-11 dates from
1970, when, AFAIK, BBSes, if they existed, were far from what people
think they were.
I'm thinking of,say, Call Computer in Mountain View, frequented by the
HCC pe
On 05/18/2017 12:27 PM, allison via cctalk wrote:
> BBSs are really the thing from about 1978 to pre-internet (varied
> where you lived). Examples of the big BBS are Source, Delphi, Well,
> STD(software tool and die), and the big one Compuserve. Small ones
> like Sage and those mentioned by infer
So, if it's authenticity you want, you'll have to incorporate some sort
of noise generator on the lines. Telco quality is much better today
than 40 years ago (although you may not think so). I recall that
calling Sunnyvale from Los Gatos (or vice-versa) was a real adventure in
connectivity. Lo
On 05/20/2017 11:12 AM, Warner Losh via cctalk wrote:
> In the bay area in california, and likely elsewhere too, there was a local
> calling zone that was set based on the population patterns of the 1950's
> and 1960's. This meant that calls to some numbers were free, while others
> had a toll ass
On 05/22/2017 07:52 AM, Diane Bruce via cctalk wrote:
> I never said I wasn't worried about both fluorescents and CFL's. I
> find it horrendous that people freak out over CFL's yet blithely
> throw their fluorescents into the garbage without a thought; And yet
> older fluorescents were far worse
On 05/22/2017 09:08 AM, William Sudbrink via cctalk wrote:
> Don't forget playing with a big tub of Hg in chemistry class.
Heh. I remember building a mercury diffusion pump as a special class
project. If a kid was to spill as much mercury today that I spilled
back then, they'd probably raze the
On 05/22/2017 10:44 AM, Jim Brain via cctalk wrote:
> I know it's not considered a "true" teletype, because it's
> essentially a little uC, a KB, and a little dot matrix printer, but I
> will wear the stigma of shame of not owning a "proper" mechanical
> model 33. I got home last night, and the u
On 05/23/2017 05:40 PM, Fred Cisin via cctalk wrote:
> On Tue, 23 May 2017, Warner Losh via cctalk wrote:
> In addition to cleaning the heads, look at the parts that slide when the
> head moves. The old grease is probably in bad shape by now. With a
> little solvent (WD-40 is NOT a solvent), cle
On 05/23/2017 05:31 PM, Andrew Harvey via cctalk wrote:
> I don't think Indivudual Computers make the catweasle any more. They never
> released a 64bit Windows driver for it.
In point of advancing technology, one can purchase a STM32F4 development
board with USB, UART, microSD, battery-backed RTC
On 05/23/2017 05:31 PM, Andrew Harvey via cctalk wrote:
> I don't think Indivudual Computers make the catweasle any more. They never
> released a 64bit Windows driver for it.
In point of advancing technology, one can purchase a STM32F4 development
board with USB, UART, microSD, battery-backed RTC
On 05/24/2017 01:59 AM, Torfinn Ingolfsen via cctalk wrote:
> On Wed, May 24, 2017 at 8:30 AM, Chuck Guzis via cctalk
> wrote:
>
> Some of us just want a working solution. So, any links for hardware,
> software and an assembly description?
Mine are for specific-purpose applicati
On 05/24/2017 11:19 AM, ben via cctalk wrote:
> But who wants to write the software?
Yes, just so. I learned about that one decades ago.
> I am building a 1977 ttl style computer because now I have spare time.
> Finding vintage or similar devices is being a challenge as well fighting
> modern O
On 05/24/2017 12:49 PM, allison via cctalk wrote:
> I remember when RTL was new and uRTL was a later improvement.
Flatpack and TO-100. I probably still have a few mW RTL packages
around. DIPs came later.
--Chuck
On 05/24/2017 12:49 PM, allison via cctalk wrote:
> I remember when RTL was new and uRTL was a later improvement.
Flatpack and TO-100. I probably still have a few mW RTL packages
around. DIPs came later.
--Chuck
On 05/24/2017 02:28 PM, Al Kossow via cctalk wrote:
> Once you've built up a set of test vectors, it actually becomes really
> obvious where a single gate error is through simulation.
Does anyone collect the old Zycad hardware emulators? They were the
(very expensive) cat's whiskers at one time
On 05/24/2017 07:03 PM, Zane Healy via cctech wrote:
> I think you’ll find that’s an ACSI Disk, I’m not sure how compatible
> they are with SCSI.
ACSI is close--there are some differences from SCSI. I still have a
board I built back in the day to bridge the SCSI-ACSI difference. I
used it with an
On 05/25/2017 07:31 AM, Fred Jan Kraan via cctalk wrote:
> This is indeed very easy to implement, I did it in less than a day,
> including some doc: https://fjkraan.home.xs4all.nl/digaud/arduino/FDDExer/.
Nice--I did a similar one using a $4 Maple Mini clone. (STM32F103).
Again, as you say, simp
On 05/25/2017 08:13 AM, Paul Koning via cctalk wrote:
.
>
> For some definition of "standard". It seems that IBM did this, and DEC prior
> to the PDP-11, but other machines of that time or earlier numbered bits
> according to the power of 2 they represent, i.e., the "current standard".
> CDC
On 05/28/2017 04:38 PM, Mike Stein via cctalk wrote:
> I have a bus backplane here, very similar to an S100 backplane but the 2x50
> connectors use .1 in spacing instead of .125 and the supply voltages are
> regulated +5 and +/- 12V.
Photo, please?
--Chuck
On 05/29/2017 10:13 AM, Mike Stein via cctalk wrote:
> But it's also quite possible that the PS and the backplane don't even
> belong together.
^ This was my initial guess. It just looked wrong.
--Chuck
On 06/02/2017 07:55 AM, Al Kossow via cctalk wrote:
>
> A very odd version of the PDP-11
>
> I did some programming on it for GI in the late 70's using their
> GIMINI development system and cross-development tools on their Sigma
> 9.
I sold a bare CP1600 chip about a year ago to a collector.
On 06/02/2017 09:37 AM, Cameron Kaiser wrote:
> But that was because it has memory-mapped I/O, no? On the other hand
> the decles were weird and it has a lot of instructions that were
> removed.
GI made a 10-bit wide ROM for program storage, as I recall. I think the
10-bit instruction word was the
On 06/04/2017 11:47 AM, Al Kossow via cctalk wrote:
>
>
> On 6/4/17 3:35 AM, ANDY HOLT via cctalk wrote:
>
>> I would think it "not too difficult" to build a modern controller
>
> The electronics isn't the problem. Getting a poorly stored
> electromechanical device to not turn your or any other
On 06/04/2017 02:43 PM, jim stephens via cctalk wrote:
> Note as a side story, they had been doing something similar to a
> source control program, so though the above sounds like a fantastic
> amount of software, some times one or two card drawer racks contained
> dozens of revisions of the same
On 06/06/2017 01:40 PM, dwight via cctalk wrote:
> If you look on the ebay for a dolch ethernet sniffer, you'll see
>
> many with no keyboard.
>
> Why would someone separate the keyboard from a box when it
>
> is clipped onto it?
>
> These are not just any keyboard. They have custom shaped case
On 06/06/2017 08:32 PM, Michael Hunter via cctech wrote:
> Hey folks,
>
> I hope all is well. Curiosity got the better of me and I sent in an EMAC
> external HDD I had for my old Mac Plus in for recovery. I'm happy to report
> that the recovery was a success. Now I'm struggling to figure out how t
On 06/07/2017 10:47 AM, Paul Koning via cctech wrote:
> 6600 core memory is documented in great detail in the training manual
> which is on Bitsavers. It has conventional diagonal sense lines. It
> does have some interesting design attributes, though. For one thing,
> it has pairs of inhibit wi
On 06/07/2017 05:02 PM, Paul Koning wrote:
> I'd love to know. I never saw the insides of ECS. There are some
> documents on Bitsavers but none that I have seen show the ECS memory
> subsystem itself, certainly not at the circuit level.
I found a paper from SJCC 1967 that does a pretty good job
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