On 09/06/2017 09:41 AM, Jon Elson via cctalk wrote:
> On 09/06/2017 11:03 AM, Al Kossow via cctalk wrote:
>>
>> On 9/5/17 11:09 PM, Chuck Guzis via cctalk wrote:
>>
>>> The read results have improved considerably.
>> tension arm servo acting reasonably?
>>
On 09/26/2017 12:52 PM, Fred Cisin via cctalk wrote:
> Get SpeedStor (SSTOR.EXE) and use it.
> Once you do, you will never want to go back to the "Advanced
> Diagnostics" nor the BIOS routine.
That'll work. You can also scribble up your own formatter using the
BIOS calls--or check the SIMTEL20
On 09/26/2017 11:57 AM, geneb via cctalk wrote:
> g=c800:5
Unfortunately, I agree with Fred. The stock IBM WD1003 controller ROM
did not have a format routine. Other models of the WD1003 did,
however--you'll see that the controller is a WD1003-something and that
may shed some light on its
On 09/24/2017 02:50 AM, Aaron Jackson via cctalk wrote:
>
> Yes you are right, it is in a tightly sealed casing and getting it open
> is probably going to be very destructive.
Got a photo--these things aren't that uncommon in the surplus market, so
it may be possible simply replace the thing.
On 09/26/2017 03:53 PM, Jules Richardson via cctalk wrote:
> On 09/26/2017 01:19 PM, Ethan via cctalk wrote:
>> I don't know if it's a good idea to low level format a drive or not.
>
> I remember at least one manufacturer recommending it for their drive(s)
> if they were ever tilted through 90
On 09/26/2017 06:45 PM, Anders Nelson via cctalk wrote:
> Cool, is there documentation available for this formatting and
> error-check/correction algorithm and structure? I'd like to take a look!
A good place to start is the HP "Introduction to Magnetic Tape" in
bitsavers:
On 09/25/2017 11:40 PM, Steve Malikoff via cctalk wrote:
> Yes, you will need the controller to at least format, but not sure about just
> reading/writing.
Looking at the interface, it's pretty much a "raw" interface.
As in a lot of things in life, timing is everything in tapes.Tape
blocks
On 09/28/2017 07:34 AM, Al Kossow via cctalk wrote:
> Most drives 40mb and up are closed-loop with dedicated
> servo surfaces and many have servos that don't work any more.
>
> Maxtor and Atasi are early examples of embedded servo drives.
> You can tell if a drive is embedded or dedicated by the
On 09/28/2017 05:12 PM, Jules Richardson via cctalk wrote:
> On 09/27/2017 09:59 AM, Ethan via cctalk wrote:
>> The idea of IDE, as my understanding, is the controller that existed
>> as an
>> ISA card was moved onto the actual drive, and then what became the
>> controller was mostly just
On 09/28/2017 08:57 PM, Anders Nelson via cctalk wrote:
> Update: I bought the Kennedy 9800 as it pushed all my buttons at once.
>
> Now I'm looking for 8" mag tapes/reels that will fit! Anyone know where I
> can find these, maybe 3pcs? I could laser-cut some frosted acrylic or
> machine some
On 09/29/2017 03:01 PM, Al Kossow via cctalk wrote:
>
>
> On 9/29/17 11:35 AM, Chuck Guzis via cctalk wrote:
>
>> Does the little Kennedy drive have a vacuum takeup reel?
>
> No, they are tension arm, very similar design to the 7970
>
> I wanted to compare the
On 09/29/2017 07:04 PM, Warner Losh via cctalk wrote:
> I think there are two barriers to that. No sata is a cards. And BIOS of
> that era still required you to tell it the chs for the drive...
So, let's change the acronym to SSATA - "Serial Sort-of AT Attachment"
--Chuck
On 09/30/2017 04:12 PM, Tom Gardner via cctalk wrote:
> I think Chuck has it backwards, AT Attachment as defined by the ANSI
> committee publically predates IDE. Although IDE was used internally at WD
> it did not surface publically until well after the ANSI committee adopted AT
> Attachment,
Hi Anders,
I found the reason for my SD card problems--a missing semicolon. There
was supposed to be a stall until SDIO transfer complete; instead of a
stall, the next statement was being executed.
Argh. It's those little things that really trip you up.
At any rate, I've even got
What I found a little surprising is that on a 7970 head assembly, the DC
resistance of the 9 track coils is about 76 ohms, but on the 7 track
side, the resistance measures out to about 27 ohms.
Yet, both feed into the same read amplifiers. On the standard 7970
dual-mode drives, the switching
On 09/30/2017 06:29 PM, Jon Elson wrote:
> Ahh, but the genius is built into the heads! Note that nobody
> recorded 800 BPI on 7-track tapes. I think they supported 200 and 556
> BPI, only. There were some low-density 9-track tapes, but generally
> most 9-tk tapes were 800 BPI.
Say what? We
On 09/30/2017 11:50 AM, Richard Cini via cctech wrote:
> I’m in the process or restoring a Seattle Gazelle for the Vintage
> Computer Federation and one of the disks that it came with had
> “Norton Utilities” written on it. I’ve imaged the disk but I’m not
> entirely sure what system it was for,
On 10/01/2017 12:46 PM, Tom Gardner via cctalk wrote:
> I've looked for but cannot find any WD or Compaq documents publically
> using IDE to describe what ultimately issued as ATA-1. My search
> included various Compaq maintenance manuals. The earliest public use
> of ATA and AT attachment that
Doing some quick research, the governing patent seems to be
https://www.google.com/patents/US5295247
filed in 1992, where the term IDE is used exclusively.
Further, PC Magazine has ads for IDE interface motherboards in early 1989.
Neither mentions ATA.
If desired, I'll keep digging.
--Chuck
On 09/29/2017 06:07 AM, Paul Koning wrote:
> There are chips that convert between serial and parallel ATA; one of
> those could perhaps be used. I'm more used to applying them for
> attaching a serial ATA controller to a parallel ATA drive, but
> possibly they might work in the other direction
On 09/29/2017 01:11 AM, Christian Corti via cctalk wrote:
> I don't consider writing servo information as lowlevel formatting.
I should have been more precise. What I meant was "embedded servo".
Most, if not all, modern drives use this technique rather than dedicate
a separate surface to
For what it's worth, I found long ago that the IDE interface was far
closer to the PC-based ESDI controller command set than the WD MFM drive
one. ESDI even responds to commands such as IDENTIFY, where that
command doesn't exist in the WD1003-type controller vocabulary. ESDI
also supports larger
On 09/29/2017 09:00 AM, Al Kossow via cctalk wrote:
>
>
> On 9/29/17 8:48 AM, Jon Elson via cctalk wrote:
>
>> I did a few of these on a lathe years ago. It was a couple minutes job per
>> reel.
>
> you are also going to have to cut holes near the hub so that you can get a
> tape started
>
On 09/28/2017 06:03 PM, Fred Cisin via cctalk wrote:
> For a little while, there were also available some 8 bit IDE cards
> and drives! I think that Compaq may have been the first customer for
> the Western Digital IDE "Integrated Drive Electronics"
Yup, it's sometimes called XTA. Very
I'm suffering from TL;DR disease this morning, so I didn't have the
inclination to follow all of the links cited in the discussion, so my
apology is presented in advance.
However, there *was* another way to handle large drives in earlier DOS
before 4.0. It was far from satisfactory, because it
On 10/02/2017 10:47 PM, Tom Gardner via cctalk wrote:
> Nice find but still later than Mar 1989.
You must have missed my second post--January 31, 1989.
--Chuck
On 10/03/2017 05:37 AM, wrco...@wrcooke.net wrote:
> fwiw in the late 80s I was the service department at a small PC
> store. I remember seeing these newfangled drives in Compaq
> computers, but I don't remember exactly when. Perhaps 88? Wikipedia
> backs me up that it was Compaq (with WD
On 09/25/2017 08:27 AM, Anders Nelson via cctalk wrote:
> Cool! Aaa, good to know one of them can't be used individually.
>
> What might be involved in using one with a PDP-8/e emulated on SimH? I can
> build/program any sort of custom USB device to interface this big stuff,
> which I'll
On 08/21/2017 07:32 AM, Jules Richardson via cctalk wrote:
> And if we're talking WWII, wasn't it duck tape? Duck cloth with an
> adhesive layer. "Duct tape" came later...
>
> I wonder if we're being messed with ;-)
Well, to throw some kerosene on the fire, this from Wikipedia:
"According to
Related to this, did Bob Bemer ever preserve a copy of IBM COMTRAN
source? For those unaware of it, this was one of the predecessors of
COBOL.
While thinking about Bob and his contributions to ASCII, I'm reminded
that one of the constraints imposed on the FORTRAN language was the lack
of what
On 08/28/2017 10:43 AM, Shoppa, Tim via cctalk wrote:
> IEEE Annals of the History of Computing just published (in past few months)
> Paul McJones article "In Search of the Original Fortran Compiler".
>
> Many of us have been following Paul's efforts (and helping out in different
> ways) for
On 09/01/2017 10:26 AM, Kip Koon via cctalk wrote:
> What is it that is great news. This is all I received.
>
> Kip Koon
> computer...@sc.rr.com
> http://www.cocopedia.com/wiki/index.php/User:Computerdoc
>
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On
On 09/01/2017 12:37 PM, Eric Christopherson wrote:
>
> Strangely, the original message went through Gmail just fine, but your
> reply (Chuck) is flagged as spam.
I have no idea of what's going on--best to whitelist me if you want to
see my posts--OTOH, maybe not. :)
I've noticed that some of
On 10/05/2017 12:36 PM, jim stephens via cctalk wrote:
> The Kennedy 9800 is an oddball with 1200' reels, and a smaller panel
> footprint.
Kennedy made some incremental tape drives for key-to-tape systems with
8" reel capacity. The advantage, of course, is the smaller
footprint--and key-to-tape
On 10/05/2017 04:22 AM, allison via cctalk wrote:
> Funny the market knew of the 386 in the fall of '85 but it would be
> three years before I'd see
> one in the field. Disks and CPUs lagged the introductions by years due
> to cost.
It was hard to rationalize the extra cost of a 16MHz 80386
On 10/05/2017 11:39 AM, Rich Alderson via cctalk wrote:
> From: Chuck Guzis
> Sent: Wednesday, October 04, 2017 1:46 PM
>
>> As an aside, I picked up a 1986 Wren II full-height manual that discussed the
>> drive and its various interfaces. Sadly, IDE isn't one, but SCSI is referred
>> to as
On 10/04/2017 01:45 PM, Fred Cisin via cctalk wrote:
> I don't know why the model number label didn't include the interface,
> number of cylinders and heads, maybe even rotation speed.
>
> And why the manufacturer's bad track list was often a loose piece of
> paper, rather than a stuck on label.
On 10/04/2017 12:17 PM, Jay West via cctalk wrote:
> On 10/3/17 7:24 PM, Chuck Guzis via cctalk wrote:
>> Al has a bunch of 7970 stuff on bitsavers, but not, I think (I could
>> be wrong) the manual specific to the B and C models.
>
> I do have a chunk of HP service manu
I just pulled off a book from my shelf entitled "The SCSI Bus and IDE
Interface, Protocols, Applications and Programming", by Friedhelm
Schmidt, Addison-Wesley, 1995, ISBN 0-201-42284-0. (From the look and
feel of the book, this appears to be the first time I've cracked it.)
Here's what Mr.
On 10/04/2017 03:10 PM, Fred Cisin via cctalk wrote:
Why on earth would WD have anything to do with it? They supplied the
controller, but not the drives. I used to have an early Maxtor ~50MB
3.5" drive with bugs in the interface. Nowhere did they give any nod to WD.
--Chuck
On 10/06/2017 10:53 PM, Steve Malikoff via cctalk wrote:
> After the discussion last year about lifting and racking heavy gear, I bodged
> together some hardware and
> came up with the PDP-Lifter. It allows easy movement, lifting and lowering
> for racking and unracking equipment
> in 19" racks.
On 10/10/2017 11:16 AM, Evan Koblentz via cctalk wrote:
> I texted our project leader. He replied: "The short answer is I don't
> know. The copy I got is from one of the sailors on a destroyer with the
> equipment. Most programs written for the 1219 used an assembler called
> TRIM or Ultra.
On 09/26/2017 09:53 PM, Mike Stein via cctalk wrote:
> Ah yes, the interesting 11MB IMI 7710. Cromemco also used them in their Z-2H;
> I still have one somewhere, not a bad drive when it worked ;-)
The really crazy thing is that we were taking our hardware over to
Viking Labs to do
On 10/10/2017 04:24 PM, Paul Koning via cctalk wrote:
> CDC end of record or end of file marks are not tape marks. They are data
> blocks (very short ones).
Indeed. A file mark is 17 octal with even parity, regardless of the
data parity (odd in this case). The puzzling thing is the 00 octal
Nevermind--I found a label that identifies them as 7094 tapes.
Thanks, all.
--Chuck
On 10/18/2017 06:19 PM, Jon Elson wrote:
> Yes, I had a 3500 Lb lathe shipped from NJ to MO for $600 (although that
> was some years ago.)
> I had a 1700 Lb pick and place machine shipped from Boston to MO for
> somewhat less than that.
> FedEx and UPS have arrangements for boxes up to 170 LBS, I
On 10/18/2017 06:45 PM, Brad H via cctalk wrote:
> I just purchased an RCA Microtutor minus the rather important CPU card. I
> can recreate the card but I expect locating the 1801 chips will be
> difficult. I am just posting this in various forums in case anyone has any
> leads on where I might
On 10/17/2017 04:56 AM, Dominique Carlier via cctalk wrote:
> Hi guys!
>
> Nobody here has any information to help me to solve my problem?
> Do you think I should talk about this breakdown on another forum? If
> yes, have you an address to recommend me?
>
Dominique, the probably reason that
On 10/17/2017 10:50 AM, Dominique Carlier via cctalk wrote:
> Hi Chuck,
>
> Yes I understand well. But the fact that the machines Z80 based were all
> equipped with this famous serial I/O channel A and B, I therefore
> thought that the principle of verification of these channels would
> probably
I've just received a query from an outfit in BC who has a few (<10) RSX
(apparently) either RX01 or RX02 floppies that they'd like to extract
the files from.
Since the number of floppies is small and it's an international affair,
I'd rather not do the work myself.
Bonus points if you can
On 10/18/2017 09:12 AM, Jack Harper via cctalk wrote:
>
>
> Possibly... :)
>
> Freight charge to get one from the Washington, DC area to Colorado
> is about $700 USD - and that is by Donkey :)
>
> Anders, I have been monitoring the one in the DC area - the freight
> cost alone is "large."
On 10/23/2017 01:45 PM, Rob Jarratt via cctalk wrote:
> I am now looking at the H7826 PSU that came with a TURBOchannel Extender. It
> looks like there may have been capacitor leakage and some heatsinks will
> need to be replaced. I have posted pictures here:
>
>
>
>
On 11/15/2017 11:59 AM, Rick Bensene via cctalk wrote:
> While the definition of the term "personal computer" varies depending
> on who is using the term, these machines, and others like them, were
> designed to be used at a much more personal level than the large-scale
> mainframe machines
On 11/15/2017 10:17 AM, Jon Elson via cctalk wrote:
> MANY companies were quite bad at making a go of the computer business.
> Xerox is probably legendary, but GE and RCA were certainly also famous
> for this. Honeywell made a LOT of computers in various forms -
> aerospace, minicomputer,
On 11/15/2017 11:18 AM, Alan Perry via cctalk wrote:
> Burroughs
> UNIVAC
> NCR
> CDC
> Honeywell
Ah, so post-Snow White.
--Chuck
Just passing this along in case someone needs a bunch of TK70 cartridges:
ITEM Description Qty
TK52-K 70 Digital Compactape II - 95/296MB136
These are new/sealed.
email Sandy at pebz *at* cybertrails.com with your needs for a quote.
Disclaimer: I'm just
On 11/15/2017 02:39 PM, Rick Bensene via cctalk wrote:
> Perhaps the glass-room meme isn't so much bogus, as it is a sign of
> the cultural times. In those days, the big machines were very
> expensive, and required a lot of support -- that meant special
> power, air conditioning, raised
On 11/23/2017 07:02 PM, Paul Berger via cctalk wrote:
> I have managed to get 2 PC type drives working in a 9122C they are two
> different versions of the YE Data YD-702D. The important thing is the
> drive needs to provide a ready signal, diskette change and density.
> Most drives provide the
On 11/26/2017 02:09 PM, Ed via cctalk wrote:
> does the 71 sate seem early?
Looking at the modem, perhaps a little too early, judging from its size.
Patent date perhaps?
But 300 baud acoustic coupler modems date into the 1960s.
--Chuck
On 11/22/2017 02:52 PM, Tom Gardner via cctalk wrote:
> The following answer comes from a retired IBM tape technologist:
>
> The color of the coatings on a tape are dominated by the magnetic pigment (or
> the carbon used in back coats..which is black)..the earliest iron oxide
> coatings were
On 11/27/2017 11:15 AM, Alan Frisbie via cctalk wrote:
> Back in those days you could not connect anything directly to the telephone
> lines -- you had to use the telco-supplied DAA (kaching!) or an acoustic
> coupler. I don't know if this modem can be connected directly to a phone
> line
On 11/23/2017 11:34 AM, Adrian Graham via cctalk wrote:
> None of the pots on the video board deal with contrast so I’ve got it out on
> the bench to remove and test the capacitors. What else can I look at at the
> same time? Someone else has already mentioned the transistors Q101, Q102 and
>
On 12/16/2017 05:21 PM, Fred Cisin via cctalk wrote:
> So, some of us do not trust the labels on disks.
Ha. I lost a bit of hair when I received a batch of 8" hard-sector
disks and tried to make sense of them. What were obviously sector
headers didn't line up at all with any of the sector
On 12/15/2017 08:09 PM, Brian L. Stuart via cctalk wrote:
> I'd have to go back and look at the details to see how fast it was actually
> running. Somewhere in the back of my mind, I had to back off a little
> bit on what the hardware could do because something on the software
> side couldn't
On 12/16/2017 10:43 AM, Fred Cisin via cctalk wrote:
> On Sat, 16 Dec 2017, Aaron Jackson via cctalk wrote:
>> Well, would you believe it. It was the disks after all. I can't believe
>> they are all bad!
>
> I can believe it.
> Were they "bad"?
> Or just not what they were labelled as being?
I
On 12/12/2017 09:34 AM, Liam Proven via cctalk wrote:
> Although they make a very fast Classic MacOS box and a fairly slow OS
> X one, I found it very worthwhile to have OS X on there, even if just
> for downloading all the various tools and things you need to get
> Classic MacOS running nicely.
Got a taker with backup, thanks!
--Chuck
of these "in the flesh". I
doubt that any exist today, but I'll be happily disabused of this notion.
--Chuck
On 12/18/2017 09:14 AM, Chuck Guzis via cctalk wrote:
> Well, this is part of the job. I got the potential client to send a
> photo of the cartridge--and he managed to get
On 12/17/2017 09:52 PM, Jon Elson wrote:
> There were several DIFFERENT formats used with these standard tape
> cartridges. I have some old CDC Patriot tape drives that did a
> serpentine single track at a time format on a 3480-compatible tape. I
> don't think any DEC drive supported the
On 12/14/2017 08:58 PM, Gregory McGill via cctalk wrote:
> I recently picked this up from shopgoodwill and it has an older power
> plug. It is NOT a standard plug as shown in the picture below that is too
> tall and pins are smaller etc..
>
> Anyone know the name of this 'standard' so I can find
On 12/14/2017 08:58 PM, Gregory McGill via cctalk wrote:
> I recently picked this up from shopgoodwill and it has an older power
> plug. It is NOT a standard plug as shown in the picture below that is too
> tall and pins are smaller etc..
>
> Anyone know the name of this 'standard' so I can find
Anyone looking for these old WD controllers? I've got a mixed tube of
the WD37C65-02 parts and the SMC FDC37C65B equivalents. $10+shipping
takes the lot.
--Chuck
On 12/13/2017 02:49 PM, ANDY HOLT wrote:
>
> eBay Item 302562153660
>
>
> Can't see this item, ut
> Tape drives in flight cases (which I assume is described) are normally data
> loggers or part thereof.
URL: https://goo.gl/LWshxS
Yup it's a big NASA flight case. 8 BNC connectors. What
Discovered a Z-World "Tiny Giant" SBC220D development board. Seems to
work; if powered on, the LED blinks. Its a Zilog Z180 board--and I can't
remember a thing about it other than playing with it a bit.
Yours for shipping (it's about 5x6") and should fit in a USPS small FRB.
--
Hi Folks,
We've got a Canadian customer with what appears to be an IBM 3480
cartridge that he'd like to get the data from. We don't get nearly
enough request for these IBM carts to make owning a unit a viable
proposition.
I understand that the 3480 format was supported by a wide range of
This one has me scratching my head.
eBay Item 302562153660
Sure, it's a Kennedy 9832 drive mounted in some sort of giant hard case.
Anyone know if this was a modified drive? What on earth would it be
used for?
--Chuck
On 11/17/2017 09:24 AM, Peter Allan via cctalk wrote:
> I was a student at Manchester University from 1974 to 1980. During that
> time I used the University of Manchester Regional Computer Centre (UMRCC)
> computer system. The so-called Joint System consisted of a CDC 7600 with an
> ICL 1906A
On 11/17/2017 05:34 PM, Jim Brain via cctalk wrote:
> It does not have to be fast. I rather thought, "what is the simplest
> multi-cpu shared bus that could be easily understood by folks and allow
> them to focus on multi-processing education, not bus understanding"
How about a serial bus?
On 11/20/2017 05:40 AM, allison via cctalk wrote:
> Creating a bus to accommodate any one cpu at a time is far more
> straightforward and there are plenty of
> examples than one that is running a mix of many cpus.
Oddly enough, I'm in agreement. :)
Today, it really makes little sense to have
On 11/20/2017 11:37 AM, allison via cctalk wrote:
> I did that back when with a S100 machine expanded with multiple
> Z80s(local ram and MMU), global mmemory and 8085s and 8749s to have
> intelligent peripherals and shared loading and tasks. An interesting
> experiment and some elements still
While working on some old (again!) half-inch tapes, I note that some of
the very old ones have an oxide coating about the color of milk
chocolate. Newer ones are anywhere from dark chocolate to black.
Reel construction is another aspect. The really old ones tend to be all
clear plastic,
On 11/18/2017 01:21 PM, Aaron Jackson via cctech wrote:
> You might be surprised how many LCD monitors support SoG. I have several
> iiyama LCD panels which work fine with a 3100.
>
All of my NEC Multisync LCD ones do--some even have 5 BNC connectors for
video input.
--Chuck
On 11/19/2017 08:11 PM, Ken Seefried via cctalk wrote:
> More importantly, the vast number of compatible I/O cards that were
> produced. Much alternative history to be pondered.
So we agree on parallel standard buses, that STD bus is a strong
contender with varied processor base.
There *is*
This is a pretty far-fetched request, but here goes.
The quick-release levers on the HP 7970 tape drive are plastic.
They're starting to get brittle. I've got one that's showing cracks, so
I swapped it the the one on the takeup reel, as that one doesn't see as
much action as the one on the
On 11/16/2017 12:30 PM, Geoffrey Reed via cctalk wrote:
> ³Floptical² disks 720 rpm 1.6 Mb/s transfer 1250 TPI and 25MB unformatted
> capacity
>
> LS-120 and LS-240 (which sadly I can¹t remember the specs of :(
How about the Caleb "it" drive (UHD144):
It's always struck me how revolutionary (for IBM) the change in
architecture from the 700x to the S/360 was. The 709x will probably
strike the average reader of today as being arcane, what with
sign-magnitude representation, subtractive index registers and so on.
The 7080, probably even more so.
On 11/17/2017 09:17 AM, allison via cctech wrote:
> Also the Syquest 270mb IDE/parallel port cartridge disk. I have one
> that works
> and over a dozen carts. Its still in use in a ITX box using the IDE
> interface. After
> two decades of use it seems solid.
I've left out the non-floppy
On 11/17/2017 06:33 PM, ben via cctalk wrote:
> Say USB-version 101101100 :)
No, I'm serious--lowers parts count tremendously. I run SPI at 40 MHz.
But for something simpler in a parallel bus there's always STD bus, or
STD-32.
--Chuck
Well, when in doubt, check 22Disk, right? Here are the CP/M formats:
BEGIN OTR1 Otrona Attache - DSDD 48 tpi 5.25"
DENSITY MFM, LOW
CYLINDERS 40 SIDES 2 SECTORS 10,512 SKEW 2
SIDE1 0 1,2,3,4,5,6,7,8,9,10
SIDE2 1 1,2,3,4,5,6,7,8,9,10
ORDER EAGLE
BSH 4 BLM 15 EXM 1 DSM 181 DRM 127 AL0 0C0H AL1 0
A bit more on the RX03 floppies and why putr probably dies.
The home block for these contains the usual "DECRT11A" and "RT11A" tags,
as well as the Rad-50 "V3A", cluster size and first directory segment
pointer, but everything else in the block is set to ASCII space (hex
20), including the
On 11/03/2017 05:40 PM, Brian Walenz via cctech wrote:
> I'm assembling a PDP-8/a from a pile of parts, but I'm missing the entire
> AC power entry assembly, as shown in
> http://www.retrotechnology.com/restore/8a_trans_gnd0.jpg. Does anyone know
> what the 6-pin connector is? Even better, does
On 12/02/2017 05:18 PM, Paul Berger via cctalk wrote:
> A good source of replacement displays is from 12C of the same vintage,
> there was lots of them produced and they can often be obtained for a
> reasonable cost. If you you look in the archives of the forums on
> hpmuseum.org you will find
On 12/06/2017 07:00 PM, Paul Berger via cctalk wrote:
> Well that usually means that there is contamination at the connection
> point or the sandwich is not clamped tightly enough. I have cleaned
> them off with alcohol and a lint free cloth. If I remember correctly
> there is not space for you
On 12/06/2017 07:30 PM, Paul Berger via cctalk wrote:
> You are welcome glad it is going again it is the very best programmers
> calculator ever made. Mine is just a little newer than yours and still
> going strong. I bought mine new when taking a 370 assembler course.
I bought mine when my TI
Well, I replaced the LCD and was greeted with missing segments. Any
suggestions before I throw in the towel?
That glue from hell necessitated picking off the black plastic shielding
bit by bit with forceps ans a magnifying glass. Really awful stuff.
--Chuck
On 12/11/2017 12:45 PM, Mattis Lind via cctalk wrote:
> Or maybe a suggestion for another connector that could be modified into fit
> somehow? Potentially using glue to fixate it.
I wonder if you could re-work the drive to use a standard 13W3 connector?
--Chuck
On 12/03/2017 10:00 AM, Tony Duell wrote:
> That sounds like the original version with the separate logic module.
>
> I think the display is the same between the 2 versions. I am also
> pretty sure the same display is used in all the old Voyagers (there
> are annunciators on it that are not used
On 12/06/2017 10:10 AM, Tony Duell wrote:
> 'Later' here might mean the modern versions of the 12C, which is very
> different. I thought both types of construction of the original Voyagers
> used the same display but I must admit I have never swapped them over.
Feh, the "old" HP12C that I got
On 12/06/2017 01:22 PM, Paul Berger via cctalk wrote:
> I just looked back at the archives of the hpmuseum.org site and the
> donor 12C that the display came from for the 16C I repaired for another
> MoHPC member had a serial number that began with 2224A and was the
> version with the innards
On 12/06/2017 02:51 PM, Paul Berger via cctalk wrote:
> Ok I am guessing you have figured out how to take the back off? (screws
> under the rubber feet) with the calculator upside down and the display
> away from you there is a connector at the top right that connects the
> keyboard to the
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