IBM 6360 - Filesystem(ish) info?

Anders Nelson anders.k.nelson at
Tue Feb 19 14:05:56 CST 2019

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

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

More information about the cctalk mailing list