[Coco] The .DSK format/structure

[tim at franklinlabs.com]

For the most part, the DSK image is just that. An image. There's no specific
format for a DSK file. A floppy diskette or hard drive is divided into sectors.
These sectors are either 256 or 512 bytes in length. The CoCo is 256 bytes. the
sector length is determined by the original operating system used. These sectors
are save in a DSK file as raw data. The format is determined by the drive
emulation software being used.



On August 22, 2014 at 10:56 AM Tony Cappellini <cappy2112 at gmail.com> wrote:
> As as result of listening to Randy Kindig's floppy days podcasts,
> I'm now playing with an Apple II emulator and software. I've noticed that
> this emulator also reads .DSK images. But I'm fairly sure that the author
> of the emulator chose the .DSK extension as a convenience.
>
> I want to look at the differences between the Apple2 and coco .DSK images.
> Would someone point me to the following:
>
> 1. The specification for a coco .DSK image. Obviously, at some level this
> needs
> to be the same as the floppy disk format for a physical floppy, but
> this structure could also be embedded within a higher level structure
> of the file.
>
> 2. Software used for reading/writing coco .DSK images.
> 3. Source code for that reading/writing coco .DSK images
>
> I want to write a small program that will detect the image type and dump
> the contents of either disk image.
>
> Thanks
>
>
> Tony
>
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