[Coco] CoCo Emulator Floppy Images - JVC format

[tim lindner]

Eric J. Rothfus <eric at rothfus.com> wrote:

> Does anyone have JVC-formatted floppy images that are
> not of the "simple" kind?  For a quick explanation of
> the JVC format take a look at (from Tim's site):
> 
>    http://home.netcom.com/~tlindner/JVC.html
> 
> All JVC-format images that I have are either 161,280 or
> 184,320 bytes long, corresponding to 35 and 40 track
> CoCo DD 18-sector images.  These images do NOT have the
> JVC header, indicating that they are "simple" images
> that use the default parameters.

My web page above does contain a link to download some non standard
(with header) disk images. They are under section H (Example files).

> Does anyone have images that HAVE the header in them?
> These JVC images would PROBABLY be (or thereabouts)
> 161,915 or 161,285 bytes long for 35 track and 185,045
> or 184,325 bytes for 40 track.  These images would
> probably not use the default parameters and may have
> deleted sectors or some form of copy protection.

The JVC format does not support the concept of deleted sectors. You can
only suppily the number (total count) of sectors. I suppose if you set
the sector count to 17, then there is a missing sector at the end, but
then all tracks have a missing sector at the end.

You'll need to investigate the DMK format for more functionality.

-- 
tim lindner
tlindner at ix.netcom.com                                            Bright