[Coco] .dsk format

Tue Mar 10 13:36:48 EDT 2009

You can do it if you have a 360k floppy drive on a windows 98 machine
OR a 3.5" drive on the W98 machine and on the coco.  I use David
Keil's emulator because it has virtual to real drive drivers.  From
the documentation:

Depending on compatibility of your PC you should be able to read/write
single density & double density 5.25" and 3.5" disks in 360k and 720k
PC floppy drives (commonly known as low/double density drives, DD).
You should be able to read/write double density 5.25" and 3.5" disks
in 1.2meg and 1.44meg PC floppy drives (commonly known as high density
drives, HD).

Eight fixed sector length REAL floppy specification virtual disks are
supplied to read/write 256 byte/sector floppies in a PC's A: and B:
drives.

FDD0_360.DSK  	Reads 35/40 track disks on a PC A: 360k (DD) drive.
FDD1_360.DSK 	Reads 35/40 track disks on a PC B: 360k (DD) drive
FHD0_360.DSK 	Reads 35/40 track disks on a PC A: 1.2meg (HD) drive.
(double steps head)
FHD1_360.DSK 	Reads 35/40 track disks on a PC B: 1.2meg (HD) drive.
(double steps head)
FHD0_720.DSK 	Reads 80 track disks on a PC A: 1.2meg (HD) drive.
FHD1_720.DSK 	Reads 80 track disks on a PC B: 1.2meg (HD) drive.
F350_720.DSK 	Reads 80 track 3.5" disks on a PC A: 1.44meg (HD) drive.
F351_720.DSK 	Reads 80 track 3.5" disks on a PC B: 1.44meg (HD) drive.

Eight variable sector length REAL floppy specification virtual disks
are supplied to read/write 128-1024 byte/sector floppies in a PC's A:
and B: drives. These specification disks are slower than the fixed
length ones and should only be used on disks un-readable with the
fixed length specification disks.

VDD0_360.DSK 	Reads 35/40 track disks on a PC A: 360k (DD) drive.
VDD1_360.DSK 	Reads 35/40 track disks on a PC B: 360k (DD) drive
VHD0_360.DSK 	Reads 35/40 track disks on a PC A: 1.2meg (HD) drive.
(double steps head)
VHD1_360.DSK 	Reads 35/40 track disks on a PC B: 1.2meg (HD) drive.
(double steps head)
VHD0_720.DSK 	Reads 80 track disks on a PC A: 1.2meg (HD) drive.
VHD1_720.DSK 	Reads 80 track disks on a PC B: 1.2meg (HD) drive.
V350_720.DSK 	Reads 80 track 3.5" disks on a PC A: 1.44meg (HD) drive.
V351_720.DSK 	Reads 80 track 3.5" disks on a PC B: 1.44meg (HD) drive.

I can confirm that it is possible to write a 360k floppy disk (or 180k
for DECB) on a 5.25" 1.2mb disk drive.  I have successfully written
both OS-9 and Nitros-9 .dsk images to floppy using this method, also
Donkey Kong and several other games.  I seem to recall that I had to
fiddle around in the BIOS with the 1.2mb drive's settings to make it
720k (not really sure - its been a while) and I had to try a couple of
the above listed .dsk images to get it to work.  It took a bit of
experimentation.  Also, I might have formatted the disk on the coco
first.

You put the .dsk image that you want to copy in drive 0 and the
virtual driver .dsk image in drive 1 and just backup 0 to 1.

If you can't get it to work let me know and I'll fire up old 98 and
run through the procedure again to get the correct steps.

On Tue, Mar 10, 2009 at 1:04 PM, Tom Seagrove <tjseagrove at writeme.com> wrote:
> Am I right in assuming that with either coconet or drivewire I can access a
> vitual .dsk and do a disk copy to a real disk on my coco system?
>
> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
> Behalf Of Roger Taylor
> Sent: Tuesday, March 10, 2009 12:18 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] .dsk format
>
> At 09:10 AM 3/10/2009, you wrote:
>>I do not know of a utility that runs on the coco end which will
>>allow you to mount a .dsk image as a "real" disk.
>
> Are you sure he's not wanting to know about DriveWire or CoCoNet?
>
>
>
>
>
>
>
>
>
>
>>Bill <cwgordon at carolina.rr.com> wrote: Pardon what may be a silly
>>question, but can files saved in the .dsk format
>>be downloaded and put back on their original condition using a coco?
>>
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