Looking for HDOS diskette layout

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Wed Feb 4 20:25:11 2004

> > 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 ?????

> 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 Wed Feb 04 2004 - 20:25:11 GMT