Looking for HDOS diskette layout

From: Don Maslin <donm_at_cts.com>
Date: Thu Feb 5 17:54:37 2004

On Wed, 4 Feb 2004, Fred Cisin wrote:

> > > Nope. HDOS is a completely different OS. As I recall,
> > > the directory is somplace in the middle of the disk.
> > > Dwight
> >
> > If HDOS is the same as ZDOS - and I assume that it is - it is an
>
> On a H8/H19 ?????

Hmmmm! Major brain fart, I think!!

                                                - don


> > MSDOS related system and uses an 820K DOS format (512x8) with the
> > two copies of the FAT on sectors 2 and 3 and the Directory
> > starting on 4.
>
> 512 x 8 would usually give you 640K
> 512 x 9 would usually give you 720K
>
> > > >> Does anyone know or have a reference regarding the
> > > >> layout of the HDOS (H8/H19) diskette and filesystem?
> > > >> The generic HDOS documentation doesn't include it.
> > > >Isn't it just CP/M 1.4?
>
> There were a LOT of Heath and Zenith formats, including hard-sectored one,
> aftermarket soft sector conversions, their own OS, CP/M, and MS-DOS.
> It would be best to not extrapolate from other models.
>
>
>
>
>
Received on Thu Feb 05 2004 - 17:54:37 GMT