[Coco] Nitros9 Boot Process

[Bill Pierce]

Walter, you are confusing RSDOS with OS9.... HDBDOS has NOTHING to do with OS9. The "offsets" used in HDBDOS are there JUST to get HDBDOS past the OS9 sectors of the drive to read the 256 RSDOS disk images that follow (if configured as such).
Drivewire does not know of or care about any drive size set by RSDOS or OS9... it's a dumb server that just reads/writes. The limits are set by you... 35tr SSDD in HDBDOS, and anything you want in OS9, set by the descriptor parameters.

You really need to do some reading...
The OS9 User Manuals (all of them)
Inside OS9 L2
Rainbow Guide To OS9
Rainbow Guide To OS9 L2
 
 
 
-----Original Message-----
From: Walter <zambotti at iinet.net.au>
To: 'CoCoList for Color Computer Enthusiasts' <coco at maltedmedia.com>
Sent: Tue, Jan 15, 2019 8:55 am
Subject: Re: [Coco] Nitros9 Boot Process

I have been reading the DriveWire 4 documentation and it describes the HDBDOS mode.

I can see that the sector offset and size limit are set in the Drive Params...

I have:

- enabled HDBDOS mode
- mounted VCCemudisk.vhd in drive 0 (no limits)
- mounted VCCemudisk.vhd in drive 1 offset 0 size limit 630

But this did not appear to limit the access to the first floppy.

A  "dir /x1"  still shows the main hard drive of VCCemudisk.vhd is mounted.

In fact it doesn't seem to matter what offset and size I enter I can only ever access the main OS9 hard drive.

I am assuming that VCCemudisk has 256 630 sector floppies preceding the main OS9 hard drive.

Walter



-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Walter
Sent: Tuesday, 15 January 2019 9:06 PM
To: 'CoCoList for Color Computer Enthusiasts'
Subject: Re: [Coco] Nitros9 Boot Process

Thanks.

That makes sense for a boot from a floppy connected directly from the system.

How does HDB-DOS and DW4 change that?

When the vhd contains a number of preliminary floppies and then a hard drive HDB-DOS must load the kernel file from track 34 of the nominated floppy.  But the bootfile must reside where? The floppy or the hard drive.

Is it possible to mount the virtual floppies that precede the harddrive in a VHD so that they can be accessed from Nitros9 via DW?

If not the build process for creating a bootable VHD image must be via an external tool!

Walter

-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Tormod Volden
Sent: Tuesday, 15 January 2019 8:20 PM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] Nitros9 Boot Process

On Tue, Jan 15, 2019 at 12:57 PM Walter wrote:
>
> Where can I find a detailed description of the boot process and what sectors
> it expects to use, etc.

This might be helpful:
http://www.nitros9.org  -> "NitrOS-9 wiki for documentation" -> "The
NitrOS-9 Boot Process Explained"

Regards,
Tormod

-- 
Coco mailing list
Coco at maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco


-- 
Coco mailing list
Coco at maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco


-- 
Coco mailing list
Coco at maltedmedia.com
https://pairlist5.pair.net/mailman/listinfo/coco