[sebhc] Re-creating actual floppies from archive
dwight.elvey at amd.com
Tue Mar 14 20:03:53 CST 2006
>From: "Lee Hart" <leeahart at earthlink.net>
>Joe Smith wrote:
>> All those images and no way to turn them back into disks? That is
>> basically what I want to know, I don't really see anything that
>> lets you do that.
>Heath's standard disk distribution format was 5.25", single-sided,
>single density (about 90k per disk) for *both* hard-sector (H17) and
>soft-sector (H37) controllers. Obviously, the soft-sector controller
>could store a lot more by using double- or extended-density and/or
>double-sided. But keeping the same single-density format made it easy to
>put your master distribution files on a disk -- both have the same
>layout; same tracks, same sector size, same number of sectors.
>I think that the Heath format puts the sector numbers *in* in sectors;
The hard sectored puts the sector number in the sector header. As
you state, these can be arrange in any order on the physical disk.
HDOS isn't to fussy about inteleaving but BASIC can be a real
dog without the right interleaving. For BASIC, it depends on
which you'd like to optimize for, reading disk or writing disk
but 1:1 interleaving is real slow.
All of the hard sectored images are not interleaved for HDOS.
The CP/M maybe since they used an software interleaving table
from 2.0 on ( may have been earlier ).
So, should application programs that use the standard HDOS calls
run on both soft sectored as well as hard sectored??
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