Need information on TRSDOS 1.3 internals

From: Michael Nadeau <menadeau_at_attbi.com>
Date: Thu Dec 5 06:13:00 2002

I have the Pennington book, Sellam. If you can't find a copy locally, I
might be able to scan the pertinent sections.

--Mike

Michael Nadeau
Editor/Publisher
Classic Tech, the Vintage Computing Resource
www.classictechpub.com

----- Original Message -----
From: "Eric Smith" <eric_at_brouhaha.com>
To: <cctalk_at_classiccmp.org>
Sent: Wednesday, December 04, 2002 10:51 PM
Subject: Re: Need information on TRSDOS 1.3 internals


> Sellam asks:
> > Does anyone have any documentation on the data structures of TRSDOS 1.3?
> > Specifically, I'd like to know the catalog structure, as well as the
> > scheme for storing files across multiple sectors.
>
> I think you want _TRS-80 Disk and Other Mysteries_. That was one of
> the Mysteries books I didn't have, but ISTR that Al turned up a copy
> recently.
>
> Each track had 10 sectors. They were allocated to files in groups of
> five, which were called granules or grans. There's a Granule Allocation
> Table (GAT) which I think was basically an allocation bitmap.
>
> In other DOSes for the TRS-80, which had support for higher-capacity
> disks, the number of sectors per granule was often different.
>
> Eric
>
>
>
Received on Thu Dec 05 2002 - 06:13:00 GMT