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From: Jack Tseng on 26 Jan 2010 00:56
Can you find the DOS program that write the C1541 formatted disk in IBM 360K
floppy drive from the D64 image? Like Writeatr.exe

Thanks!
JT


From: mrtinbspam on 26 Jan 2010 04:00
Hi!

Imposible, as 1541 uses GCR-encoding, and PC-drives uses MFM-encoding.
Unfortunatly it cannot be overrided, as the MFM-encoding is done with
a chip on the PC.

However it is possible with 3.5" 1581 and a 3.5" PC-drive, as both
uses MFM-encoding.

This is why we for decades have connected a 1541 to the PC-printerport
with a X1541-cable. Newer versions of these cables exist today, even
som with USB-support. I think OpenCBM is the newest thing here.

/mrtinb


On 26 Jan., 06:56, "Jack Tseng" <tse...(a)hotmail.com> wrote:
> Can you find the DOS program that write the C1541 formatted disk in IBM 360K
> floppy drive from the D64 image? Like Writeatr.exe
>
> Thanks!
> JT
From: Peter Dassow on 26 Jan 2010 06:38
mrtinbspam(a)gmail.com wrote:
> Imposible, as 1541 uses GCR-encoding, and PC-drives uses MFM-encoding.
> Unfortunatly it cannot be overrided, as the MFM-encoding is done with
> a chip on the PC.

That's not the whole truth. There was a special disk controller named
"Catweazle", which made it possible to write also GCR coded Apple II
disk images for example.

Regards
Peter
From: Rainer Buchty on 26 Jan 2010 11:31
In article <4b5ed42d$0$6555$9b4e6d93(a)newsspool4.arcor-online.net>,
Peter Dassow <z80eu(a)arcor.de> writes:
|> mrtinbspam(a)gmail.com wrote:
|> > Imposible, as 1541 uses GCR-encoding, and PC-drives uses MFM-encoding.
|> > Unfortunatly it cannot be overrided, as the MFM-encoding is done with
|> > a chip on the PC.
|>
|> That's not the whole truth. There was a special disk controller named
|> "Catweazle", which made it possible to write also GCR coded Apple II
|> disk images for example.

The truth in here is that people should properly differentiate between
the drive and the controller.

Rainer
From: Peter Dassow on 26 Jan 2010 12:08
Rainer Buchty wrote:
> In article <4b5ed42d$0$6555$9b4e6d93(a)newsspool4.arcor-online.net>,
> Peter Dassow <z80eu(a)arcor.de> writes:
> |> mrtinbspam(a)gmail.com wrote:
> |> > Imposible, as 1541 uses GCR-encoding, and PC-drives uses MFM-encoding.
> |> > Unfortunatly it cannot be overrided, as the MFM-encoding is done with
> |> > a chip on the PC.
> |>
> |> That's not the whole truth. There was a special disk controller named
> |> "Catweazle", which made it possible to write also GCR coded Apple II
> |> disk images for example.
>
> The truth in here is that people should properly differentiate between
> the drive and the controller.
>
So what's the point here ? I didn't mix it, you did.
He (Jack) can take almost any PC diskette drive, the drive itself does
not have any limitation what format it can use, if an appropriate
controller like the mentioned 'catweasel' controller is used.
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