there is a nice table in this to show the differences between ST506 and ESDI
https://www.ardent-tool.com/misc/Evolution_of_ESDI.html
On 2/12/21 8:12 AM, Al Kossow via cctalk wrote:
On 2/12/21 7:04 AM, Mattis Lind via cctalk wrote:
I am pretty sure that my controller is the IBM Enhanced ESDI board and
having support for it in Linux is probably unlikely. But perhaps it is the
WD1007
It is not WD. It is IBM's own design using
On 02/12/2021 09:04 AM, Mattis Lind via cctalk wrote:
I am a bit confused about the READ GATE. It has to be deasserted
in the PLO SYNC interval. Why is that? I am clearly missing something.
ESDI has a clock separator built into the drive, with logic
to decode the data format and convert
to
On 2/12/21 7:04 AM, Mattis Lind via cctalk wrote:
I am pretty sure that my controller is the IBM Enhanced ESDI board and
having support for it in Linux is probably unlikely. But perhaps it is the
WD1007
It is not WD. It is IBM's own design using an Adaptec controller
and a 8031
I am pretty sure that my controller is the IBM Enhanced ESDI board and
having support for it in Linux is probably unlikely. But perhaps it is the
WD1007, I am not sure until I checked and it is 100 km away right now.
Anyway I did some reading of the ESDI spec. There are things that I really
like
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
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.
>
>
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
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
> 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
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 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
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
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
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