IBM 6360 - Filesystem(ish) info?

[Anders Nelson]

Ah, cool thanks!

I'm interested in storing arbitrary files in the manner close to the
original as possible. Sounds like the extent list and allocation map would
be useful for this; not so much the document content format.
--
Anders Nelson

+1 (517) 775-6129

www.erogear.com


On Tue, Feb 19, 2019 at 2:44 PM Chuck Guzis <cclist at sydex.com> wrote:

> On 2/19/19 11:12 AM, Anders Nelson wrote:
> > Hi again,
> >
> > Is there a description of the DW filesystem somewhere I can look at?
>
> Hi Anders,
>
> Not that I'm aware of, unless Al has some document squirreled away that
> we don't know about.
>
> What I know is from a lot of examining DW floppies and trying to
> reverse-engineer it--and what little I could find on the web.
>
> The DW filesystem is basically a linked-list sort of structure.  There's
> a volume header block that contains an extent list and allocation map,
> from which documents are treed from.  Each document, in turn, links to
> other entries that describe various properties of each document.  For
> example, the dates of the document, its name, the list of positions of
> lines within the document, the document text, the formatting information
> for the text, and so on.   It's pretty complicated.
>
> One aside is that even though the DW is an 8086 system, numeric
> quantities are big-endian.
>
> --Chuck
>
>