Re: Nibble Images ...

[mjmahon@aol.com (Michael J. Mahon)]

Rubywand wrote:

>Vincent Joguin writes ...
>>

<snip>

>> Lastly, in fact, it's partially possible to read a track (even an
>> Apple 2 track) with a single drive. Read the 1DISKDRV.TXT file in the
>> DOCS\TECH subdirectory of the archive which explains (for the Amiga,
>> but Apple 2 is the same in this case) how little room on a track is
>> necessary to be able to read the rest back. Again, unfortunately, the
>> Apple 2 drive (as well as most drives of the time, except on IBM
>> machines) doesn't take the index signal into account (well, there may
>> even not be an index signal at all with the disk II, but I don't know
>> it enough to be sure), so the "formatting technique" explained cannot
>> work reliably without killing one or two sectors randomly before
>> getting a chance to read them...
> ....
>
>     Yes; with a Disk II diskette you would have no index signal. 

Actually, all the 5.25" diskettes I've seen have index holes.
Apple Disk ][ drives don't read them, though, and Apple disk
formatting completely ignores the index hole.

-michael

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