5 Feb
2004
5 Feb
'04
5:54 p.m.
On Wed, 4 Feb 2004, Fred Cisin wrote:
On a H8/H19 ?????
Hmmmm! Major brain fart, I think!!
- don
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 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.