On 2021-02-11 10:55 p.m., Carlos E Murillo-Sanchez via cctalk wrote:
This decade seems to have increased the number of failing things in
such a way that the "to be repaired" backlog is growing much faster
than I can get to diminish it. Argh. A month ago my trusty HP9000/380
ran just fine
Carlos, from my experience in fixing a number of switch mode supplies in HP
gear, if the supply is dead but you have full voltage across the big filter
caps (~340v DC), it's typically a problem with the power supply to the
regulator that drives the primary switching transistor. That 'power
This decade seems to have increased the number of failing things in such
a way that the "to be repaired" backlog is growing much faster than I
can get to diminish it. Argh. A month ago my trusty HP9000/380 ran just
fine and I booted the different OS's in the SCSI and HPIB drives
connected
On Thu, 11 Feb 2021, Paul Berger via cctalk wrote:
I do seem recall using ESDI drives in a PC with 16 bit ISA slots but it is
a long time ago but I am not sure if the controller used was the RT
controller you have pictured, it seems to me the one used was a Western
Digital controller.
On
On 2021-02-11 6:35 p.m., Fred Cisin via cctalk wrote:
On Thu, 11 Feb 2021, Paul Berger via cctalk wrote:
I do seem recall using ESDI drives in a PC with 16 bit ISA slots but
it is a long time ago but I am not sure if the controller used was
the RT controller you have pictured, it seems to me
Counting in binary on ones fingers was something I first ran into at
age 11 when found a book on Military Electronics in a surplus
store. Everything simplified, but in computer section found binary
system explained with using fingers to represent bits. That was
something that I used
A person would have to be pretty good to fool a lot of us here on this
mailing list when presented with a fake Apple I. There are certain things
that would give it away. Not saying it would be impossible but it would be
eventually exposed. I can't imagine someone who knows art and appraisals
On 2/11/21 2:35 PM, Fred Cisin via cctalk wrote:
> The most likely ISA ESDI would be the WD1007 controller.
> There were a few variant submodels of that, such as with/without floppy
> support, w/wo BIOS ROM.
>
>
Most challanging was to figure out to make it say naughty things... and once
you did how it almost caused havoc in AZ
On Tuesday, February 9, 2021 Jim Brain via cctalk wrote:
I suspect the answer to question #1 is no, but thought I would ask.
1) Anyone happen to have a known working
On Fri, Dec 11, 2020 at 10:05 PM Jim Manley via cctalk
wrote:
> It's been estimated by experts that a third to half of the "original
> artwork", previously valued at a total in the tens of billions in museums
> and collectors' places, are counterfeits.
35 years ago I was in Anaheim for DECUS and
On Thu, 11 Feb 2021, Paul Berger via cctalk wrote:
I do seem recall using ESDI drives in a PC with 16 bit ISA slots but it is a
long time ago but I am not sure if the controller used was the RT controller
you have pictured, it seems to me the one used was a Western Digital
controller.
The
On 2021-02-11 4:31 p.m., Mattis Lind via cctalk wrote:
Den tors 11 feb. 2021 kl 20:36 skrev Fred Cisin via cctalk <
cctalk@classiccmp.org>:
On Thu, 11 Feb 2021, Mattis Lind via cctalk wrote:
What is the best way of dumping the contents of an ESDI disk?
Same as for ST506/412
I usually use
On 2/11/21 12:59 PM, Al Kossow via cctalk wrote:
On 2/11/21 12:51 PM, Al Kossow via cctalk wrote:
On 2/11/21 12:36 PM, Fred Cisin via cctalk wrote:
To what extent are ESDI controllers interchangeable with already written drives?
That is completely unknown, since no one ever published any
On 2/11/21 12:51 PM, Al Kossow via cctalk wrote:
On 2/11/21 12:36 PM, Fred Cisin via cctalk wrote:
To what extent are ESDI controllers interchangeable with already written drives?
That is completely unknown, since no one ever published any data about it.
It is likely that anything using the
On 2/11/21 12:36 PM, Fred Cisin via cctalk wrote:
To what extent are ESDI controllers interchangeable with already written drives?
That is completely unknown, since no one ever published any data about it.
It is likely that anything using the same chipsets will be similar, but beyond
that
On 2/11/21 12:31 PM, Mattis Lind via cctalk wrote:
But then I thought, perhaps this is a more generic problem. People having
ESDI drives (well, SMD as well I guess) that there is no controller
available for or could be made running due to drivers or whatever. So what
if those drives could be
On Thu, 11 Feb 2021, Chuck Guzis via cctalk wrote:
I'm a little confused on this. An ESDI drive, in my experience, behaves
exactly like an ATA one, right down to the command set. ESDI drives
can be soft-or-hard sectored.
What am I missing?
I'm more than a LITTLE confused by parts of this
Dear all,
I have been looking to downsize a bit in recent times and am looking to get rid
of an IBM AS/400 9404 F10 and an HP 175a oscilloscope. As these things are
large they are pickup only in the Petersfield area. I cannot guarantee either
work. Although the scope comes with spares and does
Den tors 11 feb. 2021 kl 20:36 skrev Fred Cisin via cctalk <
cctalk@classiccmp.org>:
> On Thu, 11 Feb 2021, Mattis Lind via cctalk wrote:
> > What is the best way of dumping the contents of an ESDI disk?
>
> Same as for ST506/412
>
I usually use David Gessweins MFM emulator for dumping unknown
Den tors 11 feb. 2021 kl 19:05 skrev Al Kossow via cctalk <
cctalk@classiccmp.org>:
> On 2/11/21 9:25 AM, Mattis Lind via cctalk wrote:
>
> > I have an original IBM Enhanced ESDI ISA controller board. Could that be
> > used under Linux?
>
> It's unlikely anyone ever implemented a driver for it.
>
On Thu, 11 Feb 2021, Mattis Lind via cctalk wrote:
What is the best way of dumping the contents of an ESDI disk?
Same as for ST506/412
I have an original IBM Enhanced ESDI ISA controller board. Could that be
used under Linux? Or NetBSD/FreeNSD? I googled but didn't find much.
Do you have
> > That's right, for disks detected as RX01 (which are of course fully FM, 128
> > bytes per sector).__ Sector data that is actually 0xDEADBEEF will
> > show up in the .dmk as 0xDDEEAADDBBFF.
>
> I've wondered why .dmk did that.
Redunredundancydancy?
--
On 2/11/21 10:00 AM, David Schmidt via cctech wrote:
That's right, for disks detected as RX01 (which are of course fully FM, 128 bytes per sector). Sector data that is actually 0xDEADBEEF will
show up in the .dmk as 0xDDEEAADDBBFF.
I've wondered why .dmk did that.
On 2/11/21 8:56 AM, Mattis Lind wrote:
After sending my message I did some hard drive archeology and found the
dmklib I downloaded five years ago. There were some adaptations to
handle RX02 format and it worked quite well. At least when the disk has
been read error free.
However the version
> On Feb 11, 2021, at 1:46 PM, Chuck Guzis via cctalk
> wrote:
>
> On 2/11/21 10:22 AM, Jon Elson wrote:
>
>> No. ESDI is similar to MFM, there is a differential read data pair on
>> the 20-pin connector, but the data rate is much higher, 10, 15 or 20
>> MBit/sec, and used a different
On 2/11/21 10:22 AM, Jon Elson wrote:
> No. ESDI is similar to MFM, there is a differential read data pair on
> the 20-pin connector, but the data rate is much higher, 10, 15 or 20
> MBit/sec, and used a different encoding scheme that gave more data
> bits/flux transition. I think the 34-pin
On 2/11/21 10:22 AM, Jon Elson via cctalk wrote:
I think the 34-pin connector also allowed an
additional head select bit,
so you could have up to 16 heads.
It also uses higher level serial command encoding
http://bitsavers.org/pdf/cdc/discs/wren/77738076D2_CDC_ESDI_Specification_Nov84.pdf
On 02/11/2021 11:36 AM, Chuck Guzis via cctalk wrote:
I'm a little confused on this. An ESDI drive, in my experience, behaves
exactly like an ATA one, right down to the command set. ESDI drives
can be soft-or-hard sectored.
No. ESDI is similar to MFM, there is a differential read
data
...and the mysterious Compuseam running the event.
On Thu, Feb 11, 2021 at 1:09 PM Tom Owad via cctalk
wrote:
> > On Feb 11, 2021, at 1:00 PM, Brian L. Stuart via cctalk <
> cctalk@classiccmp.org> wrote:
> >
> > - Bill Mauchly and Chris Eckert, sons of the ENIAC
> > creators
> > - Bill Mensch,
On 2/11/21 10:03 AM, Josh Dersch via cctalk wrote:
Al's right in this case. In addition to the controller almost certainly
using a different low-level format than whatever your friend's disk was
written with
Another issue with ESDI is the drive has the data separator on it and the data
rates
> On Feb 11, 2021, at 1:00 PM, Brian L. Stuart via cctalk
> wrote:
>
> - Bill Mauchly and Chris Eckert, sons of the ENIAC
> creators
> - Bill Mensch, part of the 6502 engineering team
> - Kathy Kleiman, producer of the ENIAC programmers
> documentary
Is there a connection between the ENIAC and
On 2/11/21 9:25 AM, Mattis Lind via cctalk wrote:
I have an original IBM Enhanced ESDI ISA controller board. Could that be
used under Linux?
It's unlikely anyone ever implemented a driver for it.
Is this the one used in the PC/RT with on-board DMA mastering?
I'm talking about the DEC Q-BUS DSA world where there never was any ATA :-)
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591 nw.john...@ieee.org
On 2021-02-11 1:03 p.m., Chuck Guzis via cctalk wrote:
> On 2/11/21
On Thu, Feb 11, 2021 at 9:45 AM Nigel Johnson via cctalk <
cctalk@classiccmp.org> wrote:
>
> On 2021-02-11 12:41 p.m., Al Kossow via cctalk wrote:
> > On 2/11/21 9:33 AM, Nigel Johnson via cctalk wrote:
> >> I'm about to try the very same thing.
> >>
> >> I have a MicroVAX II with a sigma MSCP
On 2/11/21 9:40 AM, Nigel Johnson via cctalk wrote:
> Doesn't ATA transfer the data in parallel? ESDI uses the same two
> connectors as MFM (20/36 IIRC) , and transfers the data serially. The
> difference between MFM and ESDI is that MFM transfers the raw analogue
> data over the cable but ESDI
This evening begins a series of events celebrating the
75th anniversary of the unveiling of the ENIAC at the
University of Pennsylvania. On the 11th and 18th, the
Philadelphia Venture Cafe will be hosting virtual round
tables with a number of us who have some connection to
the ENIAC and
On 2021-02-11 12:41 p.m., Al Kossow via cctalk wrote:
> On 2/11/21 9:33 AM, Nigel Johnson via cctalk wrote:
>> I'm about to try the very same thing.
>>
>> I have a MicroVAX II with a sigma MSCP ESDI controller. It can be set
>> for soft-secoring or various numbers of hard sectors. That is what
On 2/11/21 9:33 AM, Nigel Johnson via cctalk wrote:
I'm about to try the very same thing.
I have a MicroVAX II with a sigma MSCP ESDI controller. It can be set
for soft-secoring or various numbers of hard sectors. That is what I
see is the big issue with these drives.
A friend gave me two
Doesn't ATA transfer the data in parallel? ESDI uses the same two
connectors as MFM (20/36 IIRC) , and transfers the data serially. The
difference between MFM and ESDI is that MFM transfers the raw analogue
data over the cable but ESDI transfers digital serial data.
Nigel Johnson, MSc., MIEEE,
On 2/11/21 9:36 AM, Chuck Guzis via cctalk wrote:
An ESDI drive, in my experience, behaves
exactly like an ATA one, right down to the command set. ESDI drives
can be soft-or-hard sectored.
What am I missing?
What do you do if the controller and drive don't match?
ESDI and RLL versions of
On 2/11/21 9:25 AM, Mattis Lind via cctalk wrote:
> What is the best way of dumping the contents of an ESDI disk?
>
> I have an original IBM Enhanced ESDI ISA controller board. Could that be
> used under Linux? Or NetBSD/FreeNSD? I googled but didn't find much.
>
> Is there any other way of
I'm about to try the very same thing.
I have a MicroVAX II with a sigma MSCP ESDI controller. It can be set
for soft-secoring or various numbers of hard sectors. That is what I
see is the big issue with these drives.
A friend gave me two drives that had been written on a PC under *nix.
I do
I have a bunch of Panasonic/Matsushita 470/940 MB phase-change WORM
discs here--and the appropriate drive (Panasonic LF-5010 SCSI-2) to read
them.
Unlike CD-R media, however, the format of these discs is not anything
standard--they were essentially treated as hard disks. So, adding a
file
What is the best way of dumping the contents of an ESDI disk?
I have an original IBM Enhanced ESDI ISA controller board. Could that be
used under Linux? Or NetBSD/FreeNSD? I googled but didn't find much.
Is there any other way of dumping the disk contents?
In theory it should be just a matter
For those of you with the Atari & Commodore pen plotters that have broken
pinion gears, there's now a guy making new ones in brass:
https://www.soigeneris.com/alps-printer-plotter-mechanism-pinion-gears
g.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
Den mån 8 feb. 2021 kl 20:39 skrev David Schmidt via cctech <
cct...@classiccmp.org>:
> On 2/8/21 1:00 PM, Mattis Lind wrote:
>
> I wrote my own, not knowing where another one lived. I happen to think
> in Java, so that's what it's implemented in.
>
> Description is here:
>
>
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