[Coco] CocoSDC .vhd images

[coco at jechar.ca]

Back in the Day ( Early 90's ) Double sided floppy disks were common 
enough
SDC should really see if they can extend there support to double sided, 
if
not auto-detect at least by allowing the user to specify the type. A lot 
of
my floppy's from that time were DSDD 720K and SDC seems to be 
inconsistent about reading them especially in SDC Explorer.

On 2021-04-24 13:56, David Ladd wrote:
> 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
>> 
>> --
>> Coco mailing list
>> Coco at maltedmedia.com
>> https://pairlist5.pair.net/mailman/listinfo/coco
>> 
> 
> 
> Sincerely,
> David Ladd
> ***END OF LINE***
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> | David Ladd a.k.a. PacoOtaktay a.k.a. Drencor                          
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> |   http://dwladd.com                                                   
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