On 5/16/23 21:29, Fred Cisin via cctalk wrote:
>> From what I've heard, there has been substantial progress on the flux
> transition devices, with decoding the track to sectors, and even support
> of some file systems!
>
For years I have been telling the community that flux transition is
On 5/16/2023 4:43 PM, dave.g4...@gmail.com wrote:
Jim,
I would ask on here:-
https://groups.google.com/d/forum/mfm-discuss
to see if any one has one of these
https://www.pdp8online.com/mfm/mfm.shtml
which will image an MFM disk so you are not re-reading and probably damaging
your original,
On 5/16/2023 4:05 PM, Dennis Boone via cctalk wrote:
> At the most recent CoCoFEST!, I brought home the old Glenside Club
> Computer Hard Drive. The mechanism is an ST-251, and I was wondering
> if someone on-list would be willing to attempt to pull data off the
> drive. I have no
On 5/16/2023 3:54 PM, Mike Katz wrote:
I'm sorry but I am not familiar with any CoCo OS hard disk formats.
All valuable information, but I am not concerned about the FS format.
ONce the data can be retrieved from the platters, either I or others can
write some code or create a way to view
Similarly, he could buy a cheap external USB 3.5" drive. Write content to
that drive on the modern machine, and read those floppies on the older
machines. The readily avaailable one have firmware that only supports
720K, 1.4M, and [sometimes] NEC-style "mode 3".
On Wed, 17 May 2023, Tony
On Tue, May 16, 2023 at 11:42 PM Fred Cisin via cctalk
wrote:
>
> On Tue, 16 May 2023, Wayne S via cctalk wrote:
> > Tony in response to your original idea of wanting to download images for
> > use on you existing machines ( did i get that right?), i think you have
Yes. I've got the machines
On 5/16/23 18:57, Fred Cisin via cctalk wrote:
The biggest drive I remember seeing on OS/9 was 20MB or 40MB. I
don't remember the File Allocation Table size or format.
>>> Well, that would be "spot on", as the formatted capacity of an ST-251
>>> was
>>> 40 Megabytes.
>
>>> When used
I’ll chip in my 5 cents and say that i’ve had good experiences with PUTR, a DOS
based utility can can read, write, and mount a lot of DEC formats. I quite
successfully used it to make myself a few bootable RX50 floppies for my 11/23.
Of course, YMMV, and you’ll need a DOS/9x machine to use it,
The biggest drive I remember seeing on OS/9 was 20MB or 40MB. I
don't remember the File Allocation Table size or format.
Well, that would be "spot on", as the formatted capacity of an ST-251 was
40 Megabytes.
When used with MS-DOS, prior to
MS-DOS 3.31, it would be partitioned as
two 20MB,
On Tue, May 16, 2023, 8:30 PM Fred Cisin via cctalk
wrote:
> Well, that would be "spot on", as the formatted capacity of an ST-251 was
> 40 Megabytes.
>
> When used with MS-DOS, prior to
MS-DOS 3.31, it would be partitioned as
> two 20MB, or as a 32MB plus an 8MB.
> (V3.31 was the first version
The biggest drive I remember seeing on OS/9 was 20MB or 40MB. I don't
remember the File Allocation Table size or format.
On 5/16/2023 7:14 PM, Fred Cisin via cctalk wrote:
On Tue, 16 May 2023, Mike Katz via cctalk wrote:
Most likely there was some kind of driver for the CoCo that converted
Well, that would be "spot on", as the formatted capacity of an ST-251 was
40 Megabytes.
When used with MS-DOS, prior to MS-DOS 3.31, it would be partitioned as
two 20MB, or as a 32MB plus an 8MB.
(V3.31 was the first version of MS-DOS to support a partition larger than
32MB)
On Tue, 16 May
On Tue, 16 May 2023, Mike Katz via cctalk wrote:
Most likely there was some kind of driver for the CoCo that converted
the ST-251 into smaller logical drives for the CoCo Operating system.
One fellow, who used to be involved in Cocos, recalls one or more systems
that handled it by MANY
On 5/16/23 16:04, Fred Cisin via cctalk wrote:
>
>
> For Jim Brain's Coco disk, my inclination would be to image it on an ISA
> machine using the WD controller. but, an argument was made that a flux
> transition read might be a way to cut down on the number of reads.
Bear in mind that the
On Tue, 16 May 2023, Wayne S wrote:
Fred, glad you chimed in.
If you have the original post, Tony wants to download different things images
for those machines, probably from the internet and use the software on those
machines via floppy. As another item, he acquired a coco computer hard disk
On Tue, 16 May 2023, Kenneth Gober via cctalk wrote:
On Mon, May 15, 2023 at 11:21 PM Jim Brain via cctalk
wrote:
At the most recent CoCoFEST!, I brought home the old Glenside Club
Computer Hard Drive. The mechanism is an ST-251, and I was wondering if
someone on-list would be willing to
Fred, glad you chimed in.
If you have the original post, Tony wants to download different things images
for those machines, probably from the internet and use the software on those
machines via floppy. As another item, he acquired a coco computer hard disk
that he like to get the data from. A
On Tue, 16 May 2023, Wayne S via cctalk wrote:
Tony in response to your original idea of wanting to download images for
use on you existing machines ( did i get that right?), i think you have
everything you need already. Download the images to your win 8 box then
use file transfer software
Tony in response to your original idea of wanting to download images for use on
you existing machines ( did i get that right?), i think you have everything you
need already. Download the images to your win 8 box then use file transfer
software (kermit or xmodem) to serially transfer to the
On Tue, May 16, 2023 at 4:05 PM Dennis Boone via cctalk
wrote:
> > At the most recent CoCoFEST!, I brought home the old Glenside Club
> > Computer Hard Drive. The mechanism is an ST-251...
<
> The best way to approach this, given the interchange issues with MFM
> disk controllers, is probably
Jim,
I would ask on here:-
https://groups.google.com/d/forum/mfm-discuss
to see if any one has one of these
https://www.pdp8online.com/mfm/mfm.shtml
which will image an MFM disk so you are not re-reading and probably damaging
your original, an can then analyse the content at your leisure
> At the most recent CoCoFEST!, I brought home the old Glenside Club
> Computer Hard Drive. The mechanism is an ST-251, and I was wondering
> if someone on-list would be willing to attempt to pull data off the
> drive. I have no ability to configure to read this drive type, and
> the data
Just having the ISA card will probably not be enough unless you can find
an operating system that has drivers for that particular controller
hardware and disk format.
The color computer only had a few floppy formats (Coco, OS/9, Flex/StarDOS).
As for hard disk formats, I have no idea. I ran
I strongly recommend something like the Greaseweezle.
This is a "flux recorder" it does't know from format it just read and
write flux transitions.
There is another program that converts the flux transitions to formats.
Most formats are supported.
Including low level formats like FM,
On 5/16/2023 3:00 PM, Kenneth Gober wrote:
On Mon, May 15, 2023 at 11:21 PM Jim Brain via cctalk
wrote:
At the most recent CoCoFEST!, I brought home the old Glenside Club
Computer Hard Drive. The mechanism is an ST-251, and I was
wondering if
someone on-list would be willing
On Mon, May 15, 2023 at 11:21 PM Jim Brain via cctalk
wrote:
> At the most recent CoCoFEST!, I brought home the old Glenside Club
> Computer Hard Drive. The mechanism is an ST-251, and I was wondering if
> someone on-list would be willing to attempt to pull data off the drive.
>
In my
> On May 16, 2023, at 11:12 AM, Tony Duell via cctalk
> wrote:
>
> As you know I've recently restored a couple of CP/M luggable
> computers. I also have many other machines with floppy disk drives,
> 3", 3.5", 5.25" and 8"
>
> The machine I connect to the internet with is a more modern
As you know I've recently restored a couple of CP/M luggable
computers. I also have many other machines with floppy disk drives,
3", 3.5", 5.25" and 8"
The machine I connect to the internet with is a more modern laptop
runnng Windows 8.1. Essentially its only interfaces are USB ports.
I would
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