[Coco] CocoSDC .vhd images

[David Ladd]

On Sat, Apr 24, 2021 at 9:58 AM Robert Gault <robert.gault at att.net> wrote:

> I am probably missing something obvious but I am having problems creating
> .vhd images that will boot into NitrOS9 on the CoCoSDC.
>

For cobbler, os9gen, and other boot track management utilities to correctly
modify the boot(kernel) track you need to make sure that the sides is 1 and
sectors per track are 18 with new HDD images.  Reason for this is the
firmware of the CoCoSDC treats HDD sized images as a single sided device at
18 sectors per track when in floppy emulation mode.





> I created a large .vhd image and formatted it on th SDV. I mounted a disk
> that will boot in SDC drive 0 and the new disk in SDC1. I wrote a Basic
> program to copy track 34 to the new disk. Booted NitrOS9 and marked the
> sectors for track34 as used with ded. I then ran an edited mb.floppy to
> create an OS9Boot file, the CMDS directory, and startup.The new disk with
> the SDX explorer does not show that it can be booted. With the DOS command
> it got part way through the boot but did not have the needed RBF
> drivers.So, I used the good .vhd to boot, deleted OS9Boot from the new .vhd
> and copied over OS9Boot from the good disk. Using ded I adjusted sector 0
> to point to the boot file and set the length for the new disk. The new disk
> still will not boot and does not show the needed RBF files even though they
> are in OS9Boot.
>

If you are using the CoCoSDC boot track that has the BOOT module that is
designed for the HDD LBA mode of the CoCoSDC then should load the OS9Boot
file as normal.



> Something is causing SDCDOS to use an incorrect OS9Boot file that is not
> showing in the main directory. Sector 0 is pointing to the OS9Boot file
> that shows in the directory. There is no info I can find in the docs I have
> on the CocoSDC and SDC explorer that explains what is happening.
>
> Sent from AT&T Yahoo Mail on Android
>
> --
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> Coco at maltedmedia.com
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>


Sincerely,
David Ladd
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