Re: D9090 back to life !

From: Rob Eaglestone <>
Date: Tue, 28 Jan 2014 07:51:34 -0600
Message-ID: <>
In other words, the metadata is optional, and useful when present.  This is
not an unusual solution.

If I recall Peter Schepers' useful informational webpages, X64 isn't used
much exactly because it's a container format, and basically has to be
interpreted twice -- once to figure out what the format is, and then once
again to actually get at the image data.

There is no advantage for PC users to use this format since virtually no PC
> emulator that I know of uses them, and for the most part, it provides the
> same functionality as a D64 file.

> In order to read a generic X64 file, first you must determine that it is
> an X64, and then determine the type of file it contains. In effect, you
> have to double-decode the file, which makes support a little more
> difficult. Also, you would have to be able to work with *all* of the types
> of drives that X64 supports, a daunting task.

> Its only advantage is that is encompasses all of the standard disk formats
> on the C64. If other disk types were common (like 1581 or CMD disks), then
> this format might be more popular.

On Tue, Jan 28, 2014 at 1:13 AM, Jim Brain <> wrote:

> On 1/28/2014 12:59 AM, Groepaz wrote:
>> On Tuesday 28 January 2014, you wrote:
>>> I agree it's a more complete format, but it's not used as much.  My idea
>>> of putting this same information on track 18 would add this information
>>> to the image, and has the benefit that folks could "see" if the disk
>>> came from an image when they use a real disk.
>>> Yeah, I know it "corrupts" the image.  complaints to /dev/null
>> the major problem with that approach is that it doesnt work on disks that
>> are
>> completely filled with data (which isnt really unlikely, lots of cracks
>> and
>> demos use the dirtrack for files, for example) - which rules it out as a
>> generic solution.
>>  Well, since the block has a magic sequence, any block will work. Yes,
> though, on a completely filled disk, it's not workable.
> Still, for the millions of D64s that are not full, it's fine.  And, if the
> D64 does not have the block, it's not like it fails to work.
> It's like an MP3 in that way.
> Jim
> --
> Jim Brain
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Received on 2014-01-28 14:02:46

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